Below you find a detailed visual guide on all the supported configuration options of rustfmt:
-## `indent_style`
-
-Indent on expressions or items.
+## `binop_separator`
-- **Default value**: `"Block"`
-- **Possible values**: `"Block"`, `"Visual"`
-- **Stable**: No (tracking issue: #3346)
+Where to put a binary operator when a binary expression goes multiline.
-### Array
+- **Default value**: `"Front"`
+- **Possible values**: `"Front"`, `"Back"`
+- **Stable**: No (tracking issue: #3368)
-#### `"Block"` (default):
+#### `"Front"` (default):
```rust
fn main() {
- let lorem = vec![
- "ipsum",
- "dolor",
- "sit",
- "amet",
- "consectetur",
- "adipiscing",
- "elit",
- ];
-}
-```
+ let or = foofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoo
+ || barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar;
-#### `"Visual"`:
+ let sum = 123456789012345678901234567890
+ + 123456789012345678901234567890
+ + 123456789012345678901234567890;
-```rust
-fn main() {
- let lorem = vec!["ipsum",
- "dolor",
- "sit",
- "amet",
- "consectetur",
- "adipiscing",
- "elit"];
+ let range = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+ ..bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb;
}
```
-### Control flow
-
-#### `"Block"` (default):
+#### `"Back"`:
```rust
fn main() {
- if lorem_ipsum
- && dolor_sit
- && amet_consectetur
- && lorem_sit
- && dolor_consectetur
- && amet_ipsum
- && lorem_consectetur
- {
- // ...
- }
-}
-```
+ let or = foofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoo ||
+ barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar;
-#### `"Visual"`:
+ let sum = 123456789012345678901234567890 +
+ 123456789012345678901234567890 +
+ 123456789012345678901234567890;
-```rust
-fn main() {
- if lorem_ipsum
- && dolor_sit
- && amet_consectetur
- && lorem_sit
- && dolor_consectetur
- && amet_ipsum
- && lorem_consectetur
- {
- // ...
- }
+ let range = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa..
+ bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb;
}
```
-See also: [`control_brace_style`](#control_brace_style).
+## `blank_lines_lower_bound`
-### Function arguments
+Minimum number of blank lines which must be put between items. If two items have fewer blank lines between
+them, additional blank lines are inserted.
-#### `"Block"` (default):
+- **Default value**: `0`
+- **Possible values**: *unsigned integer*
+- **Stable**: No (tracking issue: #3382)
-```rust
-fn lorem() {}
+### Example
+Original Code (rustfmt will not change it with the default value of `0`):
-fn lorem(ipsum: usize) {}
+```rust
+#![rustfmt::skip]
-fn lorem(
- ipsum: usize,
- dolor: usize,
- sit: usize,
- amet: usize,
- consectetur: usize,
- adipiscing: usize,
- elit: usize,
-) {
- // body
+fn foo() {
+ println!("a");
+}
+fn bar() {
+ println!("b");
+ println!("c");
}
```
-#### `"Visual"`:
-
+#### `1`
```rust
-fn lorem() {}
-
-fn lorem(ipsum: usize) {}
+fn foo() {
-fn lorem(ipsum: usize,
- dolor: usize,
- sit: usize,
- amet: usize,
- consectetur: usize,
- adipiscing: usize,
- elit: usize) {
- // body
+ println!("a");
}
-```
-### Function calls
+fn bar() {
-#### `"Block"` (default):
+ println!("b");
-```rust
-fn main() {
- lorem(
- "lorem",
- "ipsum",
- "dolor",
- "sit",
- "amet",
- "consectetur",
- "adipiscing",
- "elit",
- );
+ println!("c");
}
```
-#### `"Visual"`:
-```rust
-fn main() {
- lorem("lorem",
- "ipsum",
- "dolor",
- "sit",
- "amet",
- "consectetur",
- "adipiscing",
- "elit");
-}
-```
+## `blank_lines_upper_bound`
-### Generics
+Maximum number of blank lines which can be put between items. If more than this number of consecutive empty
+lines are found, they are trimmed down to match this integer.
-#### `"Block"` (default):
+- **Default value**: `1`
+- **Possible values**: any non-negative integer
+- **Stable**: No (tracking issue: #3381)
+
+### Example
+Original Code:
```rust
-fn lorem<
- Ipsum: Eq = usize,
- Dolor: Eq = usize,
- Sit: Eq = usize,
- Amet: Eq = usize,
- Adipiscing: Eq = usize,
- Consectetur: Eq = usize,
- Elit: Eq = usize,
->(
- ipsum: Ipsum,
- dolor: Dolor,
- sit: Sit,
- amet: Amet,
- adipiscing: Adipiscing,
- consectetur: Consectetur,
- elit: Elit,
-) -> T {
- // body
+#![rustfmt::skip]
+
+fn foo() {
+ println!("a");
}
-```
-#### `"Visual"`:
-```rust
-fn lorem<Ipsum: Eq = usize,
- Dolor: Eq = usize,
- Sit: Eq = usize,
- Amet: Eq = usize,
- Adipiscing: Eq = usize,
- Consectetur: Eq = usize,
- Elit: Eq = usize>(
- ipsum: Ipsum,
- dolor: Dolor,
- sit: Sit,
- amet: Amet,
- adipiscing: Adipiscing,
- consectetur: Consectetur,
- elit: Elit)
- -> T {
- // body
+
+fn bar() {
+ println!("b");
+
+
+ println!("c");
}
```
-#### Struct
+#### `1` (default):
+```rust
+fn foo() {
+ println!("a");
+}
-#### `"Block"` (default):
+fn bar() {
+ println!("b");
-```rust
-fn main() {
- let lorem = Lorem {
- ipsum: dolor,
- sit: amet,
- };
+ println!("c");
}
```
-#### `"Visual"`:
-
+#### `2`:
```rust
-fn main() {
- let lorem = Lorem { ipsum: dolor,
- sit: amet };
+fn foo() {
+ println!("a");
}
-```
-See also: [`struct_lit_single_line`](#struct_lit_single_line), [`indent_style`](#indent_style).
-### Where predicates
+fn bar() {
+ println!("b");
-#### `"Block"` (default):
-```rust
-fn lorem<Ipsum, Dolor, Sit, Amet>() -> T
-where
- Ipsum: Eq,
- Dolor: Eq,
- Sit: Eq,
- Amet: Eq,
-{
- // body
+ println!("c");
}
```
-#### `"Visual"`:
+See also: [`blank_lines_lower_bound`](#blank_lines_lower_bound)
-```rust
-fn lorem<Ipsum, Dolor, Sit, Amet>() -> T
- where Ipsum: Eq,
- Dolor: Eq,
- Sit: Eq,
- Amet: Eq
-{
- // body
-}
-```
+## `brace_style`
-## `use_small_heuristics`
+Brace style for items
-Whether to use different formatting for items and expressions if they satisfy a heuristic notion of 'small'.
+- **Default value**: `"SameLineWhere"`
+- **Possible values**: `"AlwaysNextLine"`, `"PreferSameLine"`, `"SameLineWhere"`
+- **Stable**: No (tracking issue: #3376)
-- **Default value**: `"Default"`
-- **Possible values**: `"Default"`, `"Off"`, `"Max"`
-- **Stable**: Yes
+### Functions
-#### `Default` (default):
+#### `"SameLineWhere"` (default):
```rust
-enum Lorem {
- Ipsum,
- Dolor(bool),
- Sit { amet: Consectetur, adipiscing: Elit },
+fn lorem() {
+ // body
}
-fn main() {
- lorem(
- "lorem",
- "ipsum",
- "dolor",
- "sit",
- "amet",
- "consectetur",
- "adipiscing",
- );
-
- let lorem = Lorem {
- ipsum: dolor,
- sit: amet,
- };
- let lorem = Lorem { ipsum: dolor };
+fn lorem(ipsum: usize) {
+ // body
+}
- let lorem = if ipsum { dolor } else { sit };
+fn lorem<T>(ipsum: T)
+where
+ T: Add + Sub + Mul + Div,
+{
+ // body
}
```
-#### `Off`:
+#### `"AlwaysNextLine"`:
```rust
-enum Lorem {
- Ipsum,
- Dolor(bool),
- Sit {
- amet: Consectetur,
- adipiscing: Elit,
- },
+fn lorem()
+{
+ // body
}
-fn main() {
- lorem("lorem", "ipsum", "dolor", "sit", "amet", "consectetur", "adipiscing");
-
- let lorem = Lorem {
- ipsum: dolor,
- sit: amet,
- };
+fn lorem(ipsum: usize)
+{
+ // body
+}
- let lorem = if ipsum {
- dolor
- } else {
- sit
- };
+fn lorem<T>(ipsum: T)
+where
+ T: Add + Sub + Mul + Div,
+{
+ // body
}
```
-#### `Max`:
+#### `"PreferSameLine"`:
```rust
-enum Lorem {
- Ipsum,
- Dolor(bool),
- Sit { amet: Consectetur, adipiscing: Elit },
+fn lorem() {
+ // body
}
-fn main() {
- lorem("lorem", "ipsum", "dolor", "sit", "amet", "consectetur", "adipiscing");
-
- let lorem = Lorem { ipsum: dolor, sit: amet };
+fn lorem(ipsum: usize) {
+ // body
+}
- let lorem = if ipsum { dolor } else { sit };
+fn lorem<T>(ipsum: T)
+where
+ T: Add + Sub + Mul + Div, {
+ // body
}
```
-## `binop_separator`
+### Structs and enums
-Where to put a binary operator when a binary expression goes multiline.
+#### `"SameLineWhere"` (default):
-- **Default value**: `"Front"`
-- **Possible values**: `"Front"`, `"Back"`
-- **Stable**: No (tracking issue: #3368)
+```rust
+struct Lorem {
+ ipsum: bool,
+}
-#### `"Front"` (default):
+struct Dolor<T>
+where
+ T: Eq,
+{
+ sit: T,
+}
+```
-```rust
-fn main() {
- let or = foofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoo
- || barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar;
+#### `"AlwaysNextLine"`:
- let sum = 123456789012345678901234567890
- + 123456789012345678901234567890
- + 123456789012345678901234567890;
+```rust
+struct Lorem
+{
+ ipsum: bool,
+}
- let range = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
- ..bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb;
+struct Dolor<T>
+where
+ T: Eq,
+{
+ sit: T,
}
```
-#### `"Back"`:
+#### `"PreferSameLine"`:
```rust
-fn main() {
- let or = foofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoo ||
- barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar;
-
- let sum = 123456789012345678901234567890 +
- 123456789012345678901234567890 +
- 123456789012345678901234567890;
+struct Lorem {
+ ipsum: bool,
+}
- let range = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa..
- bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb;
+struct Dolor<T>
+where
+ T: Eq, {
+ sit: T,
}
```
+
+## `color`
+
+Whether to use colored output or not.
+
+- **Default value**: `"Auto"`
+- **Possible values**: "Auto", "Always", "Never"
+- **Stable**: No (tracking issue: #3385)
+
## `combine_control_expr`
Combine control expressions with function calls.
- **Possible values**: `true`, `false`
- **Stable**: No (tracking issue: #3388)
-## `error_on_line_overflow`
+## `edition`
-Error if Rustfmt is unable to get all lines within `max_width`, except for comments and string
-literals. If this happens, then it is a bug in Rustfmt. You might be able to work around the bug by
-refactoring your code to avoid long/complex expressions, usually by extracting a local variable or
-using a shorter name.
+Specifies which edition is used by the parser.
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3391)
+- **Default value**: `2015`
+- **Possible values**: `2015`, `2018`
+- **Stable**: Yes
-See also [`max_width`](#max_width).
+Rustfmt is able to pick up the edition used by reading the `Cargo.toml` file if executed
+through the Cargo's formatting tool `cargo fmt`. Otherwise, the edition needs to be specified
+in your config file:
-## `error_on_unformatted`
+```toml
+edition = "2018"
+```
-Error if unable to get comments or string literals within `max_width`, or they are left with
-trailing whitespaces.
+## `empty_item_single_line`
-- **Default value**: `false`
+Put empty-body functions and impls on a single line
+
+- **Default value**: `true`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3392)
+- **Stable**: No (tracking issue: #3356)
-## `fn_args_density`
+#### `true` (default):
-Argument density in functions
+```rust
+fn lorem() {}
-- **Default value**: `"Tall"`
-- **Possible values**: `"Compressed"`, `"Tall"`, `"Vertical"`
-- **Stable**: No (tracking issue: #3375)
+impl Lorem {}
+```
-#### `"Tall"` (default):
+#### `false`:
```rust
-trait Lorem {
- fn lorem(ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet);
-
- fn lorem(ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet) {
- // body
- }
-
- fn lorem(
- ipsum: Ipsum,
- dolor: Dolor,
- sit: Sit,
- amet: Amet,
- consectetur: Consectetur,
- adipiscing: Adipiscing,
- elit: Elit,
- );
+fn lorem() {
+}
- fn lorem(
- ipsum: Ipsum,
- dolor: Dolor,
- sit: Sit,
- amet: Amet,
- consectetur: Consectetur,
- adipiscing: Adipiscing,
- elit: Elit,
- ) {
- // body
- }
+impl Lorem {
}
```
-#### `"Compressed"`:
+See also [`brace_style`](#brace_style), [`control_brace_style`](#control_brace_style).
-```rust
-trait Lorem {
- fn lorem(ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet);
- fn lorem(ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet) {
- // body
- }
+## `enum_discrim_align_threshold`
- fn lorem(
- ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet, consectetur: Consectetur,
- adipiscing: Adipiscing, elit: Elit,
- );
+The maximum length of enum variant having discriminant, that gets vertically aligned with others.
+Variants without discriminants would be ignored for the purpose of alignment.
- fn lorem(
- ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet, consectetur: Consectetur,
+Note that this is not how much whitespace is inserted, but instead the longest variant name that
+doesn't get ignored when aligning.
+
+- **Default value** : 0
+- **Possible values**: any positive integer
+- **Stable**: No (tracking issue: #3372)
+
+#### `0` (default):
+
+```rust
+enum Bar {
+ A = 0,
+ Bb = 1,
+ RandomLongVariantGoesHere = 10,
+ Ccc = 71,
+}
+
+enum Bar {
+ VeryLongVariantNameHereA = 0,
+ VeryLongVariantNameHereBb = 1,
+ VeryLongVariantNameHereCcc = 2,
+}
+```
+
+#### `20`:
+
+```rust
+enum Foo {
+ A = 0,
+ Bb = 1,
+ RandomLongVariantGoesHere = 10,
+ Ccc = 2,
+}
+
+enum Bar {
+ VeryLongVariantNameHereA = 0,
+ VeryLongVariantNameHereBb = 1,
+ VeryLongVariantNameHereCcc = 2,
+}
+```
+
+
+## `error_on_line_overflow`
+
+Error if Rustfmt is unable to get all lines within `max_width`, except for comments and string
+literals. If this happens, then it is a bug in Rustfmt. You might be able to work around the bug by
+refactoring your code to avoid long/complex expressions, usually by extracting a local variable or
+using a shorter name.
+
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No (tracking issue: #3391)
+
+See also [`max_width`](#max_width).
+
+## `error_on_unformatted`
+
+Error if unable to get comments or string literals within `max_width`, or they are left with
+trailing whitespaces.
+
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No (tracking issue: #3392)
+
+## `fn_args_layout`
+
+Control the layout of arguments in a function
+
+- **Default value**: `"Tall"`
+- **Possible values**: `"Compressed"`, `"Tall"`, `"Vertical"`
+- **Stable**: Yes
+
+#### `"Tall"` (default):
+
+```rust
+trait Lorem {
+ fn lorem(ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet);
+
+ fn lorem(ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet) {
+ // body
+ }
+
+ fn lorem(
+ ipsum: Ipsum,
+ dolor: Dolor,
+ sit: Sit,
+ amet: Amet,
+ consectetur: Consectetur,
+ adipiscing: Adipiscing,
+ elit: Elit,
+ );
+
+ fn lorem(
+ ipsum: Ipsum,
+ dolor: Dolor,
+ sit: Sit,
+ amet: Amet,
+ consectetur: Consectetur,
+ adipiscing: Adipiscing,
+ elit: Elit,
+ ) {
+ // body
+ }
+}
+```
+
+#### `"Compressed"`:
+
+```rust
+trait Lorem {
+ fn lorem(ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet);
+
+ fn lorem(ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet) {
+ // body
+ }
+
+ fn lorem(
+ ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet, consectetur: Consectetur,
+ adipiscing: Adipiscing, elit: Elit,
+ );
+
+ fn lorem(
+ ipsum: Ipsum, dolor: Dolor, sit: Sit, amet: Amet, consectetur: Consectetur,
adipiscing: Adipiscing, elit: Elit,
) {
// body
```
-## `brace_style`
-
-Brace style for items
+## `fn_single_line`
-- **Default value**: `"SameLineWhere"`
-- **Possible values**: `"AlwaysNextLine"`, `"PreferSameLine"`, `"SameLineWhere"`
-- **Stable**: No (tracking issue: #3376)
+Put single-expression functions on a single line
-### Functions
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No (tracking issue: #3358)
-#### `"SameLineWhere"` (default):
+#### `false` (default):
```rust
-fn lorem() {
- // body
-}
-
-fn lorem(ipsum: usize) {
- // body
+fn lorem() -> usize {
+ 42
}
-fn lorem<T>(ipsum: T)
-where
- T: Add + Sub + Mul + Div,
-{
- // body
+fn lorem() -> usize {
+ let ipsum = 42;
+ ipsum
}
```
-#### `"AlwaysNextLine"`:
+#### `true`:
```rust
-fn lorem()
-{
- // body
-}
-
-fn lorem(ipsum: usize)
-{
- // body
-}
+fn lorem() -> usize { 42 }
-fn lorem<T>(ipsum: T)
-where
- T: Add + Sub + Mul + Div,
-{
- // body
+fn lorem() -> usize {
+ let ipsum = 42;
+ ipsum
}
```
-#### `"PreferSameLine"`:
-
-```rust
-fn lorem() {
- // body
-}
-
-fn lorem(ipsum: usize) {
- // body
-}
+See also [`control_brace_style`](#control_brace_style).
-fn lorem<T>(ipsum: T)
-where
- T: Add + Sub + Mul + Div, {
- // body
-}
-```
-### Structs and enums
+## `force_explicit_abi`
-#### `"SameLineWhere"` (default):
+Always print the abi for extern items
-```rust
-struct Lorem {
- ipsum: bool,
-}
+- **Default value**: `true`
+- **Possible values**: `true`, `false`
+- **Stable**: Yes
-struct Dolor<T>
-where
- T: Eq,
-{
- sit: T,
-}
-```
+**Note:** Non-"C" ABIs are always printed. If `false` then "C" is removed.
-#### `"AlwaysNextLine"`:
+#### `true` (default):
```rust
-struct Lorem
-{
- ipsum: bool,
-}
-
-struct Dolor<T>
-where
- T: Eq,
-{
- sit: T,
+extern "C" {
+ pub static lorem: c_int;
}
```
-#### `"PreferSameLine"`:
+#### `false`:
```rust
-struct Lorem {
- ipsum: bool,
-}
-
-struct Dolor<T>
-where
- T: Eq, {
- sit: T,
+extern {
+ pub static lorem: c_int;
}
```
+## `force_multiline_blocks`
-## `empty_item_single_line`
-
-Put empty-body functions and impls on a single line
+Force multiline closure and match arm bodies to be wrapped in a block
-- **Default value**: `true`
-- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3356)
+- **Default value**: `false`
+- **Possible values**: `false`, `true`
+- **Stable**: No (tracking issue: #3374)
-#### `true` (default):
+#### `false` (default):
```rust
-fn lorem() {}
-
-impl Lorem {}
-```
+fn main() {
+ result.and_then(|maybe_value| match maybe_value {
+ None => foo(),
+ Some(value) => bar(),
+ });
-#### `false`:
-
-```rust
-fn lorem() {
-}
-
-impl Lorem {
-}
-```
-
-See also [`brace_style`](#brace_style), [`control_brace_style`](#control_brace_style).
-
-
-## `enum_discrim_align_threshold`
-
-The maximum length of enum variant having discriminant, that gets vertically aligned with others.
-Variants without discriminants would be ignored for the purpose of alignment.
-
-Note that this is not how much whitespace is inserted, but instead the longest variant name that
-doesn't get ignored when aligning.
-
-- **Default value** : 0
-- **Possible values**: any positive integer
-- **Stable**: No (tracking issue: #3372)
-
-#### `0` (default):
-
-```rust
-enum Bar {
- A = 0,
- Bb = 1,
- RandomLongVariantGoesHere = 10,
- Ccc = 71,
-}
-
-enum Bar {
- VeryLongVariantNameHereA = 0,
- VeryLongVariantNameHereBb = 1,
- VeryLongVariantNameHereCcc = 2,
-}
-```
-
-#### `20`:
-
-```rust
-enum Foo {
- A = 0,
- Bb = 1,
- RandomLongVariantGoesHere = 10,
- Ccc = 2,
-}
-
-enum Bar {
- VeryLongVariantNameHereA = 0,
- VeryLongVariantNameHereBb = 1,
- VeryLongVariantNameHereCcc = 2,
-}
-```
-
-
-## `fn_single_line`
-
-Put single-expression functions on a single line
-
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3358)
-
-#### `false` (default):
-
-```rust
-fn lorem() -> usize {
- 42
-}
-
-fn lorem() -> usize {
- let ipsum = 42;
- ipsum
-}
-```
-
-#### `true`:
-
-```rust
-fn lorem() -> usize { 42 }
-
-fn lorem() -> usize {
- let ipsum = 42;
- ipsum
-}
-```
-
-See also [`control_brace_style`](#control_brace_style).
-
-
-## `where_single_line`
-
-Forces the `where` clause to be laid out on a single line.
-
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3359)
-
-#### `false` (default):
-
-```rust
-impl<T> Lorem for T
-where
- Option<T>: Ipsum,
-{
- // body
+ match lorem {
+ None => |ipsum| {
+ println!("Hello World");
+ },
+ Some(dolor) => foo(),
+ }
}
```
#### `true`:
```rust
-impl<T> Lorem for T
-where Option<T>: Ipsum
-{
- // body
-}
-```
-
-See also [`brace_style`](#brace_style), [`control_brace_style`](#control_brace_style).
-
-
-## `force_explicit_abi`
-
-Always print the abi for extern items
-
-- **Default value**: `true`
-- **Possible values**: `true`, `false`
-- **Stable**: Yes
-
-**Note:** Non-"C" ABIs are always printed. If `false` then "C" is removed.
-
-#### `true` (default):
+fn main() {
+ result.and_then(|maybe_value| {
+ match maybe_value {
+ None => foo(),
+ Some(value) => bar(),
+ }
+ });
-```rust
-extern "C" {
- pub static lorem: c_int;
+ match lorem {
+ None => {
+ |ipsum| {
+ println!("Hello World");
+ }
+ }
+ Some(dolor) => foo(),
+ }
}
```
-#### `false`:
-
-```rust
-extern {
- pub static lorem: c_int;
-}
-```
-## `format_strings`
+## `format_code_in_doc_comments`
-Format string literals where necessary
+Format code snippet included in doc comments.
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3353)
+- **Stable**: No (tracking issue: #3348)
#### `false` (default):
```rust
-fn main() {
- let lorem = "ipsum dolor sit amet consectetur adipiscing elit lorem ipsum dolor sit amet consectetur adipiscing";
+/// Adds one to the number given.
+///
+/// # Examples
+///
+/// ```rust
+/// let five=5;
+///
+/// assert_eq!(
+/// 6,
+/// add_one(5)
+/// );
+/// # fn add_one(x: i32) -> i32 {
+/// # x + 1
+/// # }
+/// ```
+fn add_one(x: i32) -> i32 {
+ x + 1
}
```
-#### `true`:
+#### `true`
```rust
-fn main() {
- let lorem = "ipsum dolor sit amet consectetur adipiscing elit lorem ipsum dolor sit amet \
- consectetur adipiscing";
+/// Adds one to the number given.
+///
+/// # Examples
+///
+/// ```rust
+/// let five = 5;
+///
+/// assert_eq!(6, add_one(5));
+/// # fn add_one(x: i32) -> i32 {
+/// # x + 1
+/// # }
+/// ```
+fn add_one(x: i32) -> i32 {
+ x + 1
}
```
-See also [`max_width`](#max_width).
-
## `format_macro_matchers`
Format the metavariable matching patterns in macros.
See also [`format_macro_matchers`](#format_macro_matchers).
+## `format_strings`
+
+Format string literals where necessary
+
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No (tracking issue: #3353)
+
+#### `false` (default):
+
+```rust
+fn main() {
+ let lorem = "ipsum dolor sit amet consectetur adipiscing elit lorem ipsum dolor sit amet consectetur adipiscing";
+}
+```
+
+#### `true`:
+
+```rust
+fn main() {
+ let lorem = "ipsum dolor sit amet consectetur adipiscing elit lorem ipsum dolor sit amet \
+ consectetur adipiscing";
+}
+```
+
+See also [`max_width`](#max_width).
+
## `hard_tabs`
Use tab characters for indentation, spaces for alignment
See also: [`tab_spaces`](#tab_spaces).
-## `imports_indent`
+## `hide_parse_errors`
-Indent style of imports
+Do not show parse errors if the parser failed to parse files.
-- **Default Value**: `"Block"`
-- **Possible values**: `"Block"`, `"Visual"`
-- **Stable**: No (tracking issue: #3360)
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No (tracking issue: #3390)
-#### `"Block"` (default):
+## `ignore`
-```rust
-use foo::{
- xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy,
- zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
-};
-```
+Skip formatting files and directories that match the specified pattern.
+The pattern format is the same as [.gitignore](https://git-scm.com/docs/gitignore#_pattern_format). Be sure to use Unix/forwardslash `/` style paths. This path style will work on all platforms. Windows style paths with backslashes `\` are not supported.
-#### `"Visual"`:
+- **Default value**: format every file
+- **Possible values**: See an example below
+- **Stable**: No (tracking issue: #3395)
-```rust
-use foo::{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy,
+### Example
+
+If you want to ignore specific files, put the following to your config file:
+
+```toml
+ignore = [
+ "src/types.rs",
+ "src/foo/bar.rs",
+]
+```
+
+If you want to ignore every file under `examples/`, put the following to your config file:
+
+```toml
+ignore = [
+ "examples",
+]
+```
+
+If you want to ignore every file under the directory where you put your rustfmt.toml:
+
+```toml
+ignore = ["/"]
+```
+
+## `imports_indent`
+
+Indent style of imports
+
+- **Default Value**: `"Block"`
+- **Possible values**: `"Block"`, `"Visual"`
+- **Stable**: No (tracking issue: #3360)
+
+#### `"Block"` (default):
+
+```rust
+use foo::{
+ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy,
+ zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
+};
+```
+
+#### `"Visual"`:
+
+```rust
+use foo::{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy,
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz};
```
};
```
-## `merge_imports`
+## `indent_style`
-Merge multiple imports into a single nested import.
+Indent on expressions or items.
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3362)
+- **Default value**: `"Block"`
+- **Possible values**: `"Block"`, `"Visual"`
+- **Stable**: No (tracking issue: #3346)
-#### `false` (default):
+### Array
+
+#### `"Block"` (default):
```rust
-use foo::{a, c, d};
-use foo::{b, g};
-use foo::{e, f};
+fn main() {
+ let lorem = vec![
+ "ipsum",
+ "dolor",
+ "sit",
+ "amet",
+ "consectetur",
+ "adipiscing",
+ "elit",
+ ];
+}
```
-#### `true`:
+#### `"Visual"`:
```rust
-use foo::{a, b, c, d, e, f, g};
+fn main() {
+ let lorem = vec!["ipsum",
+ "dolor",
+ "sit",
+ "amet",
+ "consectetur",
+ "adipiscing",
+ "elit"];
+}
```
+### Control flow
-## `match_block_trailing_comma`
-
-Put a trailing comma after a block based match arm (non-block arms are not affected)
-
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3380)
-
-#### `false` (default):
+#### `"Block"` (default):
```rust
fn main() {
- match lorem {
- Lorem::Ipsum => {
- println!("ipsum");
- }
- Lorem::Dolor => println!("dolor"),
+ if lorem_ipsum
+ && dolor_sit
+ && amet_consectetur
+ && lorem_sit
+ && dolor_consectetur
+ && amet_ipsum
+ && lorem_consectetur
+ {
+ // ...
}
}
```
-#### `true`:
+#### `"Visual"`:
```rust
fn main() {
- match lorem {
- Lorem::Ipsum => {
- println!("ipsum");
- },
- Lorem::Dolor => println!("dolor"),
+ if lorem_ipsum
+ && dolor_sit
+ && amet_consectetur
+ && lorem_sit
+ && dolor_consectetur
+ && amet_ipsum
+ && lorem_consectetur
+ {
+ // ...
}
}
```
-See also: [`trailing_comma`](#trailing_comma), [`match_arm_blocks`](#match_arm_blocks).
-
-## `max_width`
-
-Maximum width of each line
-
-- **Default value**: `100`
-- **Possible values**: any positive integer
-- **Stable**: Yes
-
-See also [`error_on_line_overflow`](#error_on_line_overflow).
+See also: [`control_brace_style`](#control_brace_style).
-## `merge_derives`
+### Function arguments
-Merge multiple derives into a single one.
+#### `"Block"` (default):
-- **Default value**: `true`
-- **Possible values**: `true`, `false`
-- **Stable**: Yes
+```rust
+fn lorem() {}
-#### `true` (default):
+fn lorem(ipsum: usize) {}
-```rust
-#[derive(Eq, PartialEq, Debug, Copy, Clone)]
-pub enum Foo {}
+fn lorem(
+ ipsum: usize,
+ dolor: usize,
+ sit: usize,
+ amet: usize,
+ consectetur: usize,
+ adipiscing: usize,
+ elit: usize,
+) {
+ // body
+}
```
-#### `false`:
+#### `"Visual"`:
```rust
-#[derive(Eq, PartialEq)]
-#[derive(Debug)]
-#[derive(Copy, Clone)]
-pub enum Foo {}
-```
+fn lorem() {}
-## `force_multiline_blocks`
+fn lorem(ipsum: usize) {}
-Force multiline closure and match arm bodies to be wrapped in a block
+fn lorem(ipsum: usize,
+ dolor: usize,
+ sit: usize,
+ amet: usize,
+ consectetur: usize,
+ adipiscing: usize,
+ elit: usize) {
+ // body
+}
+```
-- **Default value**: `false`
-- **Possible values**: `false`, `true`
-- **Stable**: No (tracking issue: #3374)
+### Function calls
-#### `false` (default):
+#### `"Block"` (default):
```rust
fn main() {
- result.and_then(|maybe_value| match maybe_value {
- None => foo(),
- Some(value) => bar(),
- });
-
- match lorem {
- None => |ipsum| {
- println!("Hello World");
- },
- Some(dolor) => foo(),
- }
+ lorem(
+ "lorem",
+ "ipsum",
+ "dolor",
+ "sit",
+ "amet",
+ "consectetur",
+ "adipiscing",
+ "elit",
+ );
}
```
-#### `true`:
+#### `"Visual"`:
```rust
fn main() {
- result.and_then(|maybe_value| {
- match maybe_value {
- None => foo(),
- Some(value) => bar(),
- }
- });
-
- match lorem {
- None => {
- |ipsum| {
- println!("Hello World");
- }
- }
- Some(dolor) => foo(),
- }
+ lorem("lorem",
+ "ipsum",
+ "dolor",
+ "sit",
+ "amet",
+ "consectetur",
+ "adipiscing",
+ "elit");
}
```
+### Generics
-## `newline_style`
-
-Unix or Windows line endings
-
-- **Default value**: `"Auto"`
-- **Possible values**: `"Auto"`, `"Native"`, `"Unix"`, `"Windows"`
-- **Stable**: Yes
-
-#### `Auto` (default):
+#### `"Block"` (default):
-The newline style is detected automatically on a per-file basis. Files
-with mixed line endings will be converted to the first detected line
-ending style.
+```rust
+fn lorem<
+ Ipsum: Eq = usize,
+ Dolor: Eq = usize,
+ Sit: Eq = usize,
+ Amet: Eq = usize,
+ Adipiscing: Eq = usize,
+ Consectetur: Eq = usize,
+ Elit: Eq = usize,
+>(
+ ipsum: Ipsum,
+ dolor: Dolor,
+ sit: Sit,
+ amet: Amet,
+ adipiscing: Adipiscing,
+ consectetur: Consectetur,
+ elit: Elit,
+) -> T {
+ // body
+}
+```
-#### `Native`
+#### `"Visual"`:
-Line endings will be converted to `\r\n` on Windows and `\n` on all
-other platforms.
+```rust
+fn lorem<Ipsum: Eq = usize,
+ Dolor: Eq = usize,
+ Sit: Eq = usize,
+ Amet: Eq = usize,
+ Adipiscing: Eq = usize,
+ Consectetur: Eq = usize,
+ Elit: Eq = usize>(
+ ipsum: Ipsum,
+ dolor: Dolor,
+ sit: Sit,
+ amet: Amet,
+ adipiscing: Adipiscing,
+ consectetur: Consectetur,
+ elit: Elit)
+ -> T {
+ // body
+}
+```
-#### `Unix`
+#### Struct
-Line endings will be converted to `\n`.
+#### `"Block"` (default):
-#### `Windows`
+```rust
+fn main() {
+ let lorem = Lorem {
+ ipsum: dolor,
+ sit: amet,
+ };
+}
+```
-Line endings will be converted to `\r\n`.
+#### `"Visual"`:
-## `normalize_comments`
+```rust
+fn main() {
+ let lorem = Lorem { ipsum: dolor,
+ sit: amet };
+}
+```
-Convert /* */ comments to // comments where possible
+See also: [`struct_lit_single_line`](#struct_lit_single_line), [`indent_style`](#indent_style).
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3350)
+### Where predicates
-#### `false` (default):
+#### `"Block"` (default):
```rust
-// Lorem ipsum:
-fn dolor() -> usize {}
-
-/* sit amet: */
-fn adipiscing() -> usize {}
+fn lorem<Ipsum, Dolor, Sit, Amet>() -> T
+where
+ Ipsum: Eq,
+ Dolor: Eq,
+ Sit: Eq,
+ Amet: Eq,
+{
+ // body
+}
```
-#### `true`:
+#### `"Visual"`:
```rust
-// Lorem ipsum:
-fn dolor() -> usize {}
-
-// sit amet:
-fn adipiscing() -> usize {}
+fn lorem<Ipsum, Dolor, Sit, Amet>() -> T
+ where Ipsum: Eq,
+ Dolor: Eq,
+ Sit: Eq,
+ Amet: Eq
+{
+ // body
+}
```
-## `remove_nested_parens`
+## `inline_attribute_width`
-Remove nested parens.
+Write an item and its attribute on the same line if their combined width is below a threshold
-- **Default value**: `true`,
-- **Possible values**: `true`, `false`
-- **Stable**: Yes
+- **Default value**: 0
+- **Possible values**: any positive integer
+- **Stable**: No (tracking issue: #3343)
+### Example
-#### `true` (default):
+#### `0` (default):
```rust
-fn main() {
- (foo());
-}
+#[cfg(feature = "alloc")]
+use core::slice;
```
-#### `false`:
+#### `50`:
```rust
-fn main() {
- ((((foo()))));
-}
+#[cfg(feature = "alloc")] use core::slice;
```
+## `license_template_path`
-## `reorder_imports`
-
-Reorder import and extern crate statements alphabetically in groups (a group is
-separated by a newline).
+Check whether beginnings of files match a license template.
-- **Default value**: `true`
-- **Possible values**: `true`, `false`
-- **Stable**: Yes
+- **Default value**: `""`
+- **Possible values**: path to a license template file
+- **Stable**: No (tracking issue: #3352)
-#### `true` (default):
+A license template is a plain text file which is matched literally against the
+beginning of each source file, except for `{}`-delimited blocks, which are
+matched as regular expressions. The following license template therefore
+matches strings like `// Copyright 2017 The Rust Project Developers.`, `//
+Copyright 2018 The Rust Project Developers.`, etc.:
-```rust
-use dolor;
-use ipsum;
-use lorem;
-use sit;
```
-
-#### `false`:
-
-```rust
-use lorem;
-use ipsum;
-use dolor;
-use sit;
+// Copyright {\d+} The Rust Project Developers.
```
+`\{`, `\}` and `\\` match literal braces / backslashes.
-## `reorder_modules`
+## `match_arm_blocks`
-Reorder `mod` declarations alphabetically in group.
+Wrap the body of arms in blocks when it does not fit on the same line with the pattern of arms
- **Default value**: `true`
- **Possible values**: `true`, `false`
-- **Stable**: Yes
+- **Stable**: No (tracking issue: #3373)
-#### `true` (default)
+#### `true` (default):
```rust
-mod a;
-mod b;
-
-mod dolor;
-mod ipsum;
-mod lorem;
-mod sit;
+fn main() {
+ match lorem {
+ true => {
+ foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo(x)
+ }
+ false => println!("{}", sit),
+ }
+}
```
-#### `false`
+#### `false`:
```rust
-mod b;
-mod a;
-
-mod lorem;
-mod ipsum;
-mod dolor;
-mod sit;
+fn main() {
+ match lorem {
+ true =>
+ foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo(x),
+ false => println!("{}", sit),
+ }
+}
```
-**Note** `mod` with `#[macro_export]` will not be reordered since that could change the semantics
-of the original source code.
+See also: [`match_block_trailing_comma`](#match_block_trailing_comma).
-## `reorder_impl_items`
+## `match_block_trailing_comma`
-Reorder impl items. `type` and `const` are put first, then macros and methods.
+Put a trailing comma after a block based match arm (non-block arms are not affected)
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3363)
+- **Stable**: No (tracking issue: #3380)
-#### `false` (default)
+#### `false` (default):
```rust
-struct Dummy;
-
-impl Iterator for Dummy {
- fn next(&mut self) -> Option<Self::Item> {
- None
+fn main() {
+ match lorem {
+ Lorem::Ipsum => {
+ println!("ipsum");
+ }
+ Lorem::Dolor => println!("dolor"),
}
-
- type Item = i32;
}
```
-#### `true`
+#### `true`:
```rust
-struct Dummy;
-
-impl Iterator for Dummy {
- type Item = i32;
-
- fn next(&mut self) -> Option<Self::Item> {
- None
+fn main() {
+ match lorem {
+ Lorem::Ipsum => {
+ println!("ipsum");
+ },
+ Lorem::Dolor => println!("dolor"),
}
}
```
-## `report_todo`
-
-Report `TODO` items in comments.
-
-- **Default value**: `"Never"`
-- **Possible values**: `"Always"`, `"Unnumbered"`, `"Never"`
-- **Stable**: No (tracking issue: #3393)
-
-Warns about any comments containing `TODO` in them when set to `"Always"`. If
-it contains a `#X` (with `X` being a number) in parentheses following the
-`TODO`, `"Unnumbered"` will ignore it.
-
-See also [`report_fixme`](#report_fixme).
-
-## `report_fixme`
-
-Report `FIXME` items in comments.
-
-- **Default value**: `"Never"`
-- **Possible values**: `"Always"`, `"Unnumbered"`, `"Never"`
-- **Stable**: No (tracking issue: #3394)
-
-Warns about any comments containing `FIXME` in them when set to `"Always"`. If
-it contains a `#X` (with `X` being a number) in parentheses following the
-`FIXME`, `"Unnumbered"` will ignore it.
-
-See also [`report_todo`](#report_todo).
+See also: [`trailing_comma`](#trailing_comma), [`match_arm_blocks`](#match_arm_blocks).
+## `max_width`
-## `skip_children`
+Maximum width of each line
-Don't reformat out of line modules
+- **Default value**: `100`
+- **Possible values**: any positive integer
+- **Stable**: Yes
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3389)
+See also [`error_on_line_overflow`](#error_on_line_overflow).
-## `space_after_colon`
+## `merge_derives`
-Leave a space after the colon.
+Merge multiple derives into a single one.
- **Default value**: `true`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3366)
+- **Stable**: Yes
#### `true` (default):
```rust
-fn lorem<T: Eq>(t: T) {
- let lorem: Dolor = Lorem {
- ipsum: dolor,
- sit: amet,
- };
-}
+#[derive(Eq, PartialEq, Debug, Copy, Clone)]
+pub enum Foo {}
```
#### `false`:
```rust
-fn lorem<T:Eq>(t:T) {
- let lorem:Dolor = Lorem {
- ipsum:dolor,
- sit:amet,
- };
-}
+#[derive(Eq, PartialEq)]
+#[derive(Debug)]
+#[derive(Copy, Clone)]
+pub enum Foo {}
```
-See also: [`space_before_colon`](#space_before_colon).
-
-## `space_before_colon`
+## `merge_imports`
-Leave a space before the colon.
+Merge multiple imports into a single nested import.
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3365)
+- **Stable**: No (tracking issue: #3362)
#### `false` (default):
```rust
-fn lorem<T: Eq>(t: T) {
- let lorem: Dolor = Lorem {
- ipsum: dolor,
- sit: amet,
- };
-}
+use foo::{a, c, d};
+use foo::{b, g};
+use foo::{e, f};
```
#### `true`:
```rust
-fn lorem<T : Eq>(t : T) {
- let lorem : Dolor = Lorem {
- ipsum : dolor,
- sit : amet,
- };
-}
+use foo::{a, b, c, d, e, f, g};
```
-See also: [`space_after_colon`](#space_after_colon).
-## `struct_field_align_threshold`
+## `newline_style`
+
+Unix or Windows line endings
+
+- **Default value**: `"Auto"`
+- **Possible values**: `"Auto"`, `"Native"`, `"Unix"`, `"Windows"`
+- **Stable**: Yes
+
+#### `Auto` (default):
+
+The newline style is detected automatically on a per-file basis. Files
+with mixed line endings will be converted to the first detected line
+ending style.
+
+#### `Native`
+
+Line endings will be converted to `\r\n` on Windows and `\n` on all
+other platforms.
+
+#### `Unix`
+
+Line endings will be converted to `\n`.
+
+#### `Windows`
+
+Line endings will be converted to `\r\n`.
+
+## `normalize_comments`
-The maximum diff of width between struct fields to be aligned with each other.
+Convert /* */ comments to // comments where possible
-- **Default value** : 0
-- **Possible values**: any positive integer
-- **Stable**: No (tracking issue: #3371)
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No (tracking issue: #3350)
-#### `0` (default):
+#### `false` (default):
```rust
-struct Foo {
- x: u32,
- yy: u32,
- zzz: u32,
-}
+// Lorem ipsum:
+fn dolor() -> usize {}
+
+/* sit amet: */
+fn adipiscing() -> usize {}
```
-#### `20`:
+#### `true`:
```rust
-struct Foo {
- x: u32,
- yy: u32,
- zzz: u32,
-}
+// Lorem ipsum:
+fn dolor() -> usize {}
+
+// sit amet:
+fn adipiscing() -> usize {}
```
-## `spaces_around_ranges`
+## `normalize_doc_attributes`
-Put spaces around the .., ..=, and ... range operators
+Convert `#![doc]` and `#[doc]` attributes to `//!` and `///` doc comments.
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3367)
+- **Stable**: No (tracking issue: #3351)
#### `false` (default):
```rust
-fn main() {
- let lorem = 0..10;
- let ipsum = 0..=10;
-
- match lorem {
- 1..5 => foo(),
- _ => bar,
- }
-
- match lorem {
- 1..=5 => foo(),
- _ => bar,
- }
+#![doc = "Example documentation"]
- match lorem {
- 1...5 => foo(),
- _ => bar,
- }
-}
+#[doc = "Example item documentation"]
+pub enum Foo {}
```
#### `true`:
```rust
-fn main() {
- let lorem = 0 .. 10;
- let ipsum = 0 ..= 10;
-
- match lorem {
- 1 .. 5 => foo(),
- _ => bar,
- }
-
- match lorem {
- 1 ..= 5 => foo(),
- _ => bar,
- }
+//! Example documentation
- match lorem {
- 1 ... 5 => foo(),
- _ => bar,
- }
-}
+/// Example item documentation
+pub enum Foo {}
```
-## `struct_lit_single_line`
+## `overflow_delimited_expr`
-Put small struct literals on a single line
+When structs, slices, arrays, and block/array-like macros are used as the last
+argument in an expression list, allow them to overflow (like blocks/closures)
+instead of being indented on a new line.
-- **Default value**: `true`
+- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3357)
+- **Stable**: No (tracking issue: #3370)
-#### `true` (default):
+#### `false` (default):
```rust
-fn main() {
- let lorem = Lorem { foo: bar, baz: ofo };
+fn example() {
+ foo(ctx, |param| {
+ action();
+ foo(param)
+ });
+
+ foo(
+ ctx,
+ Bar {
+ x: value,
+ y: value2,
+ },
+ );
+
+ foo(
+ ctx,
+ &[
+ MAROON_TOMATOES,
+ PURPLE_POTATOES,
+ ORGANE_ORANGES,
+ GREEN_PEARS,
+ RED_APPLES,
+ ],
+ );
+
+ foo(
+ ctx,
+ vec![
+ MAROON_TOMATOES,
+ PURPLE_POTATOES,
+ ORGANE_ORANGES,
+ GREEN_PEARS,
+ RED_APPLES,
+ ],
+ );
}
```
-#### `false`:
+#### `true`:
```rust
-fn main() {
- let lorem = Lorem {
- foo: bar,
- baz: ofo,
- };
-}
-```
+fn example() {
+ foo(ctx, |param| {
+ action();
+ foo(param)
+ });
-See also: [`indent_style`](#indent_style).
+ foo(ctx, Bar {
+ x: value,
+ y: value2,
+ });
+
+ foo(ctx, &[
+ MAROON_TOMATOES,
+ PURPLE_POTATOES,
+ ORGANE_ORANGES,
+ GREEN_PEARS,
+ RED_APPLES,
+ ]);
+ foo(ctx, vec![
+ MAROON_TOMATOES,
+ PURPLE_POTATOES,
+ ORGANE_ORANGES,
+ GREEN_PEARS,
+ RED_APPLES,
+ ]);
+}
+```
-## `tab_spaces`
+## `remove_nested_parens`
-Number of spaces per tab
+Remove nested parens.
-- **Default value**: `4`
-- **Possible values**: any positive integer
+- **Default value**: `true`,
+- **Possible values**: `true`, `false`
- **Stable**: Yes
-#### `4` (default):
+#### `true` (default):
```rust
-fn lorem() {
- let ipsum = dolor();
- let sit = vec![
- "amet consectetur adipiscing elit amet",
- "consectetur adipiscing elit amet consectetur.",
- ];
+fn main() {
+ (foo());
}
```
-#### `2`:
-
+#### `false`:
```rust
-fn lorem() {
- let ipsum = dolor();
- let sit = vec![
- "amet consectetur adipiscing elit amet",
- "consectetur adipiscing elit amet consectetur.",
- ];
+fn main() {
+ ((((foo()))));
}
```
-See also: [`hard_tabs`](#hard_tabs).
-
-## `trailing_comma`
+## `reorder_impl_items`
-How to handle trailing commas for lists
+Reorder impl items. `type` and `const` are put first, then macros and methods.
-- **Default value**: `"Vertical"`
-- **Possible values**: `"Always"`, `"Never"`, `"Vertical"`
-- **Stable**: No (tracking issue: #3379)
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No (tracking issue: #3363)
-#### `"Vertical"` (default):
+#### `false` (default)
```rust
-fn main() {
- let Lorem { ipsum, dolor, sit } = amet;
- let Lorem {
- ipsum,
- dolor,
- sit,
- amet,
- consectetur,
- adipiscing,
- } = elit;
-}
-```
+struct Dummy;
-#### `"Always"`:
+impl Iterator for Dummy {
+ fn next(&mut self) -> Option<Self::Item> {
+ None
+ }
-```rust
-fn main() {
- let Lorem { ipsum, dolor, sit, } = amet;
- let Lorem {
- ipsum,
- dolor,
- sit,
- amet,
- consectetur,
- adipiscing,
- } = elit;
+ type Item = i32;
}
```
-#### `"Never"`:
-
-```rust
-fn main() {
- let Lorem { ipsum, dolor, sit } = amet;
- let Lorem {
- ipsum,
- dolor,
- sit,
- amet,
- consectetur,
- adipiscing
- } = elit;
+#### `true`
+
+```rust
+struct Dummy;
+
+impl Iterator for Dummy {
+ type Item = i32;
+
+ fn next(&mut self) -> Option<Self::Item> {
+ None
+ }
}
```
-See also: [`match_block_trailing_comma`](#match_block_trailing_comma).
-
-## `trailing_semicolon`
+## `reorder_imports`
-Add trailing semicolon after break, continue and return
+Reorder import and extern crate statements alphabetically in groups (a group is
+separated by a newline).
- **Default value**: `true`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3378)
+- **Stable**: Yes
#### `true` (default):
+
```rust
-fn foo() -> usize {
- return 0;
-}
+use dolor;
+use ipsum;
+use lorem;
+use sit;
```
#### `false`:
+
```rust
-fn foo() -> usize {
- return 0
-}
+use lorem;
+use ipsum;
+use dolor;
+use sit;
```
-## `type_punctuation_density`
-Determines if `+` or `=` are wrapped in spaces in the punctuation of types
+## `reorder_modules`
-- **Default value**: `"Wide"`
-- **Possible values**: `"Compressed"`, `"Wide"`
-- **Stable**: No (tracking issue: #3364)
+Reorder `mod` declarations alphabetically in group.
-#### `"Wide"` (default):
+- **Default value**: `true`
+- **Possible values**: `true`, `false`
+- **Stable**: Yes
+
+#### `true` (default)
```rust
-fn lorem<Ipsum: Dolor + Sit = Amet>() {
- // body
-}
+mod a;
+mod b;
+
+mod dolor;
+mod ipsum;
+mod lorem;
+mod sit;
```
-#### `"Compressed"`:
+#### `false`
```rust
-fn lorem<Ipsum: Dolor+Sit=Amet>() {
- // body
-}
+mod b;
+mod a;
+
+mod lorem;
+mod ipsum;
+mod dolor;
+mod sit;
```
-## `use_field_init_shorthand`
+**Note** `mod` with `#[macro_export]` will not be reordered since that could change the semantics
+of the original source code.
-Use field initialize shorthand if possible.
+## `report_fixme`
+
+Report `FIXME` items in comments.
+
+- **Default value**: `"Never"`
+- **Possible values**: `"Always"`, `"Unnumbered"`, `"Never"`
+- **Stable**: No (tracking issue: #3394)
+
+Warns about any comments containing `FIXME` in them when set to `"Always"`. If
+it contains a `#X` (with `X` being a number) in parentheses following the
+`FIXME`, `"Unnumbered"` will ignore it.
+
+See also [`report_todo`](#report_todo).
+
+
+## `report_todo`
+
+Report `TODO` items in comments.
+
+- **Default value**: `"Never"`
+- **Possible values**: `"Always"`, `"Unnumbered"`, `"Never"`
+- **Stable**: No (tracking issue: #3393)
+
+Warns about any comments containing `TODO` in them when set to `"Always"`. If
+it contains a `#X` (with `X` being a number) in parentheses following the
+`TODO`, `"Unnumbered"` will ignore it.
+
+See also [`report_fixme`](#report_fixme).
+
+## `required_version`
+
+Require a specific version of rustfmt. If you want to make sure that the
+specific version of rustfmt is used in your CI, use this option.
+
+- **Default value**: `CARGO_PKG_VERSION`
+- **Possible values**: any published version (e.g. `"0.3.8"`)
+- **Stable**: No (tracking issue: #3386)
+
+## `skip_children`
+
+Don't reformat out of line modules
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: Yes
+- **Stable**: No (tracking issue: #3389)
-#### `false` (default):
+## `space_after_colon`
-```rust
-struct Foo {
- x: u32,
- y: u32,
- z: u32,
-}
+Leave a space after the colon.
-fn main() {
- let x = 1;
- let y = 2;
- let z = 3;
- let a = Foo { x: x, y: y, z: z };
-}
-```
+- **Default value**: `true`
+- **Possible values**: `true`, `false`
+- **Stable**: No (tracking issue: #3366)
-#### `true`:
+#### `true` (default):
```rust
-struct Foo {
- x: u32,
- y: u32,
- z: u32,
+fn lorem<T: Eq>(t: T) {
+ let lorem: Dolor = Lorem {
+ ipsum: dolor,
+ sit: amet,
+ };
}
+```
-fn main() {
- let x = 1;
- let y = 2;
- let z = 3;
- let a = Foo { x, y, z };
+#### `false`:
+
+```rust
+fn lorem<T:Eq>(t:T) {
+ let lorem:Dolor = Lorem {
+ ipsum:dolor,
+ sit:amet,
+ };
}
```
-## `use_try_shorthand`
+See also: [`space_before_colon`](#space_before_colon).
-Replace uses of the try! macro by the ? shorthand
+## `space_before_colon`
+
+Leave a space before the colon.
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: Yes
+- **Stable**: No (tracking issue: #3365)
#### `false` (default):
```rust
-fn main() {
- let lorem = try!(ipsum.map(|dolor| dolor.sit()));
+fn lorem<T: Eq>(t: T) {
+ let lorem: Dolor = Lorem {
+ ipsum: dolor,
+ sit: amet,
+ };
}
```
#### `true`:
```rust
-fn main() {
- let lorem = ipsum.map(|dolor| dolor.sit())?;
+fn lorem<T : Eq>(t : T) {
+ let lorem : Dolor = Lorem {
+ ipsum : dolor,
+ sit : amet,
+ };
}
```
-## `format_doc_comments`
+See also: [`space_after_colon`](#space_after_colon).
+
+## `spaces_around_ranges`
-Format doc comments.
+Put spaces around the .., ..=, and ... range operators
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3348)
+- **Stable**: No (tracking issue: #3367)
#### `false` (default):
```rust
-/// Adds one to the number given.
-///
-/// # Examples
-///
-/// ```rust
-/// let five=5;
-///
-/// assert_eq!(
-/// 6,
-/// add_one(5)
-/// );
-/// # fn add_one(x: i32) -> i32 {
-/// # x + 1
-/// # }
-/// ```
-fn add_one(x: i32) -> i32 {
- x + 1
+fn main() {
+ let lorem = 0..10;
+ let ipsum = 0..=10;
+
+ match lorem {
+ 1..5 => foo(),
+ _ => bar,
+ }
+
+ match lorem {
+ 1..=5 => foo(),
+ _ => bar,
+ }
+
+ match lorem {
+ 1...5 => foo(),
+ _ => bar,
+ }
}
```
-#### `true`
+#### `true`:
```rust
-/// Adds one to the number given.
-///
-/// # Examples
-///
-/// ```rust
-/// let five = 5;
-///
-/// assert_eq!(6, add_one(5));
-/// # fn add_one(x: i32) -> i32 {
-/// # x + 1
-/// # }
-/// ```
-fn add_one(x: i32) -> i32 {
- x + 1
+fn main() {
+ let lorem = 0 .. 10;
+ let ipsum = 0 ..= 10;
+
+ match lorem {
+ 1 .. 5 => foo(),
+ _ => bar,
+ }
+
+ match lorem {
+ 1 ..= 5 => foo(),
+ _ => bar,
+ }
+
+ match lorem {
+ 1 ... 5 => foo(),
+ _ => bar,
+ }
}
```
-## `wrap_comments`
+## `struct_field_align_threshold`
-Break comments to fit on the line
+The maximum diff of width between struct fields to be aligned with each other.
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3347)
+- **Default value** : 0
+- **Possible values**: any non-negative integer
+- **Stable**: No (tracking issue: #3371)
-#### `false` (default):
+#### `0` (default):
```rust
-// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+struct Foo {
+ x: u32,
+ yy: u32,
+ zzz: u32,
+}
```
-#### `true`:
+#### `20`:
```rust
-// Lorem ipsum dolor sit amet, consectetur adipiscing elit,
-// sed do eiusmod tempor incididunt ut labore et dolore
-// magna aliqua. Ut enim ad minim veniam, quis nostrud
-// exercitation ullamco laboris nisi ut aliquip ex ea
-// commodo consequat.
+struct Foo {
+ x: u32,
+ yy: u32,
+ zzz: u32,
+}
```
-## `match_arm_blocks`
+## `struct_lit_single_line`
-Wrap the body of arms in blocks when it does not fit on the same line with the pattern of arms
+Put small struct literals on a single line
- **Default value**: `true`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3373)
+- **Stable**: No (tracking issue: #3357)
#### `true` (default):
```rust
fn main() {
- match lorem {
- true => {
- foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo(x)
- }
- false => println!("{}", sit),
- }
+ let lorem = Lorem { foo: bar, baz: ofo };
}
```
```rust
fn main() {
- match lorem {
- true =>
- foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo(x),
- false => println!("{}", sit),
- }
+ let lorem = Lorem {
+ foo: bar,
+ baz: ofo,
+ };
}
```
-See also: [`match_block_trailing_comma`](#match_block_trailing_comma).
-
-## `overflow_delimited_expr`
-
-When structs, slices, arrays, and block/array-like macros are used as the last
-argument in an expression list, allow them to overflow (like blocks/closures)
-instead of being indented on a new line.
+See also: [`indent_style`](#indent_style).
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3370)
-#### `false` (default):
+## `tab_spaces`
-```rust
-fn example() {
- foo(ctx, |param| {
- action();
- foo(param)
- });
+Number of spaces per tab
- foo(
- ctx,
- Bar {
- x: value,
- y: value2,
- },
- );
+- **Default value**: `4`
+- **Possible values**: any positive integer
+- **Stable**: Yes
- foo(
- ctx,
- &[
- MAROON_TOMATOES,
- PURPLE_POTATOES,
- ORGANE_ORANGES,
- GREEN_PEARS,
- RED_APPLES,
- ],
- );
+#### `4` (default):
- foo(
- ctx,
- vec![
- MAROON_TOMATOES,
- PURPLE_POTATOES,
- ORGANE_ORANGES,
- GREEN_PEARS,
- RED_APPLES,
- ],
- );
+```rust
+fn lorem() {
+ let ipsum = dolor();
+ let sit = vec![
+ "amet consectetur adipiscing elit amet",
+ "consectetur adipiscing elit amet consectetur.",
+ ];
}
```
-#### `true`:
+#### `2`:
```rust
-fn example() {
- foo(ctx, |param| {
- action();
- foo(param)
- });
-
- foo(ctx, Bar {
- x: value,
- y: value2,
- });
-
- foo(ctx, &[
- MAROON_TOMATOES,
- PURPLE_POTATOES,
- ORGANE_ORANGES,
- GREEN_PEARS,
- RED_APPLES,
- ]);
-
- foo(ctx, vec![
- MAROON_TOMATOES,
- PURPLE_POTATOES,
- ORGANE_ORANGES,
- GREEN_PEARS,
- RED_APPLES,
- ]);
+fn lorem() {
+ let ipsum = dolor();
+ let sit = vec![
+ "amet consectetur adipiscing elit amet",
+ "consectetur adipiscing elit amet consectetur.",
+ ];
}
```
-## `blank_lines_upper_bound`
-
-Maximum number of blank lines which can be put between items. If more than this number of consecutive empty
-lines are found, they are trimmed down to match this integer.
-
-- **Default value**: `1`
-- **Possible values**: *unsigned integer*
-- **Stable**: No (tracking issue: #3381)
-
-### Example
-Original Code:
-
-```rust
-#![rustfmt::skip]
-
-fn foo() {
- println!("a");
-}
+See also: [`hard_tabs`](#hard_tabs).
+## `trailing_comma`
-fn bar() {
- println!("b");
+How to handle trailing commas for lists
+- **Default value**: `"Vertical"`
+- **Possible values**: `"Always"`, `"Never"`, `"Vertical"`
+- **Stable**: No (tracking issue: #3379)
- println!("c");
-}
-```
+#### `"Vertical"` (default):
-#### `1` (default):
```rust
-fn foo() {
- println!("a");
-}
-
-fn bar() {
- println!("b");
-
- println!("c");
+fn main() {
+ let Lorem { ipsum, dolor, sit } = amet;
+ let Lorem {
+ ipsum,
+ dolor,
+ sit,
+ amet,
+ consectetur,
+ adipiscing,
+ } = elit;
}
```
-#### `2`:
+#### `"Always"`:
+
```rust
-fn foo() {
- println!("a");
+fn main() {
+ let Lorem { ipsum, dolor, sit, } = amet;
+ let Lorem {
+ ipsum,
+ dolor,
+ sit,
+ amet,
+ consectetur,
+ adipiscing,
+ } = elit;
}
+```
+#### `"Never"`:
-fn bar() {
- println!("b");
-
-
- println!("c");
+```rust
+fn main() {
+ let Lorem { ipsum, dolor, sit } = amet;
+ let Lorem {
+ ipsum,
+ dolor,
+ sit,
+ amet,
+ consectetur,
+ adipiscing
+ } = elit;
}
```
-See also: [`blank_lines_lower_bound`](#blank_lines_lower_bound)
-
-## `blank_lines_lower_bound`
+See also: [`match_block_trailing_comma`](#match_block_trailing_comma).
-Minimum number of blank lines which must be put between items. If two items have fewer blank lines between
-them, additional blank lines are inserted.
+## `trailing_semicolon`
-- **Default value**: `0`
-- **Possible values**: *unsigned integer*
-- **Stable**: No (tracking issue: #3382)
+Add trailing semicolon after break, continue and return
-### Example
-Original Code (rustfmt will not change it with the default value of `0`):
+- **Default value**: `true`
+- **Possible values**: `true`, `false`
+- **Stable**: No (tracking issue: #3378)
+#### `true` (default):
```rust
-#![rustfmt::skip]
-
-fn foo() {
- println!("a");
+fn foo() -> usize {
+ return 0;
}
-fn bar() {
- println!("b");
- println!("c");
+```
+
+#### `false`:
+```rust
+fn foo() -> usize {
+ return 0
}
```
-#### `1`
-```rust
-fn foo() {
+## `type_punctuation_density`
- println!("a");
-}
+Determines if `+` or `=` are wrapped in spaces in the punctuation of types
-fn bar() {
+- **Default value**: `"Wide"`
+- **Possible values**: `"Compressed"`, `"Wide"`
+- **Stable**: No (tracking issue: #3364)
- println!("b");
+#### `"Wide"` (default):
- println!("c");
+```rust
+fn lorem<Ipsum: Dolor + Sit = Amet>() {
+ // body
}
```
+#### `"Compressed"`:
-## `required_version`
+```rust
+fn lorem<Ipsum: Dolor+Sit=Amet>() {
+ // body
+}
+```
-Require a specific version of rustfmt. If you want to make sure that the
-specific version of rustfmt is used in your CI, use this option.
+## `unstable_features`
-- **Default value**: `CARGO_PKG_VERSION`
-- **Possible values**: any published version (e.g. `"0.3.8"`)
-- **Stable**: No (tracking issue: #3386)
+Enable unstable features on the unstable channel.
-## `hide_parse_errors`
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No (tracking issue: #3387)
-Do not show parse errors if the parser failed to parse files.
+## `use_field_init_shorthand`
+
+Use field initialize shorthand if possible.
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3390)
+- **Stable**: Yes
-## `color`
+#### `false` (default):
-Whether to use colored output or not.
+```rust
+struct Foo {
+ x: u32,
+ y: u32,
+ z: u32,
+}
-- **Default value**: `"Auto"`
-- **Possible values**: "Auto", "Always", "Never"
-- **Stable**: No (tracking issue: #3385)
+fn main() {
+ let x = 1;
+ let y = 2;
+ let z = 3;
+ let a = Foo { x: x, y: y, z: z };
+}
+```
-## `unstable_features`
+#### `true`:
-Enable unstable features on the unstable channel.
+```rust
+struct Foo {
+ x: u32,
+ y: u32,
+ z: u32,
+}
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3387)
+fn main() {
+ let x = 1;
+ let y = 2;
+ let z = 3;
+ let a = Foo { x, y, z };
+}
+```
-## `license_template_path`
+## `use_small_heuristics`
-Check whether beginnings of files match a license template.
+Whether to use different formatting for items and expressions if they satisfy a heuristic notion of 'small'.
-- **Default value**: `""`
-- **Possible values**: path to a license template file
-- **Stable**: No (tracking issue: #3352)
+- **Default value**: `"Default"`
+- **Possible values**: `"Default"`, `"Off"`, `"Max"`
+- **Stable**: Yes
-A license template is a plain text file which is matched literally against the
-beginning of each source file, except for `{}`-delimited blocks, which are
-matched as regular expressions. The following license template therefore
-matches strings like `// Copyright 2017 The Rust Project Developers.`, `//
-Copyright 2018 The Rust Project Developers.`, etc.:
+#### `Default` (default):
-```
-// Copyright {\d+} The Rust Project Developers.
-```
+```rust
+enum Lorem {
+ Ipsum,
+ Dolor(bool),
+ Sit { amet: Consectetur, adipiscing: Elit },
+}
-`\{`, `\}` and `\\` match literal braces / backslashes.
+fn main() {
+ lorem(
+ "lorem",
+ "ipsum",
+ "dolor",
+ "sit",
+ "amet",
+ "consectetur",
+ "adipiscing",
+ );
-## `ignore`
+ let lorem = Lorem {
+ ipsum: dolor,
+ sit: amet,
+ };
+ let lorem = Lorem { ipsum: dolor };
+
+ let lorem = if ipsum { dolor } else { sit };
+}
+```
-Skip formatting the specified files and directories.
+#### `Off`:
-- **Default value**: format every files
-- **Possible values**: See an example below
-- **Stable**: No (tracking issue: #3395)
+```rust
+enum Lorem {
+ Ipsum,
+ Dolor(bool),
+ Sit {
+ amet: Consectetur,
+ adipiscing: Elit,
+ },
+}
-### Example
+fn main() {
+ lorem("lorem", "ipsum", "dolor", "sit", "amet", "consectetur", "adipiscing");
-If you want to ignore specific files, put the following to your config file:
+ let lorem = Lorem {
+ ipsum: dolor,
+ sit: amet,
+ };
-```toml
-ignore = [
- "src/types.rs",
- "src/foo/bar.rs",
-]
+ let lorem = if ipsum {
+ dolor
+ } else {
+ sit
+ };
+}
```
-If you want to ignore every file under `examples/`, put the following to your config file:
+#### `Max`:
-```toml
-ignore = [
- "examples",
-]
+```rust
+enum Lorem {
+ Ipsum,
+ Dolor(bool),
+ Sit { amet: Consectetur, adipiscing: Elit },
+}
+
+fn main() {
+ lorem("lorem", "ipsum", "dolor", "sit", "amet", "consectetur", "adipiscing");
+
+ let lorem = Lorem { ipsum: dolor, sit: amet };
+
+ let lorem = if ipsum { dolor } else { sit };
+}
```
-## `edition`
+## `use_try_shorthand`
-Specifies which edition is used by the parser.
+Replace uses of the try! macro by the ? shorthand
-- **Default value**: `2015`
-- **Possible values**: `2015`, `2018`
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
- **Stable**: Yes
-### Example
+#### `false` (default):
+
+```rust
+fn main() {
+ let lorem = try!(ipsum.map(|dolor| dolor.sit()));
+}
+```
-If you want to format code that requires edition 2018, add the following to your config file:
+#### `true`:
-```toml
-edition = "2018"
+```rust
+fn main() {
+ let lorem = ipsum.map(|dolor| dolor.sit())?;
+}
```
## `version`
version = "Two"
```
-## `normalize_doc_attributes`
+## `where_single_line`
-Convert `#![doc]` and `#[doc]` attributes to `//!` and `///` doc comments.
+Forces the `where` clause to be laid out on a single line.
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: #3351)
+- **Stable**: No (tracking issue: #3359)
#### `false` (default):
```rust
-#![doc = "Example documentation"]
-
-#[doc = "Example item documentation"]
-pub enum Foo {}
+impl<T> Lorem for T
+where
+ Option<T>: Ipsum,
+{
+ // body
+}
```
#### `true`:
```rust
-//! Example documentation
+impl<T> Lorem for T
+where Option<T>: Ipsum
+{
+ // body
+}
+```
-/// Example item documentation
-pub enum Foo {}
+See also [`brace_style`](#brace_style), [`control_brace_style`](#control_brace_style).
+
+
+## `wrap_comments`
+
+Break comments to fit on the line
+
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No (tracking issue: #3347)
+
+#### `false` (default):
+
+```rust
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
+```
+
+#### `true`:
+
+```rust
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+// sed do eiusmod tempor incididunt ut labore et dolore
+// magna aliqua. Ut enim ad minim veniam, quis nostrud
+// exercitation ullamco laboris nisi ut aliquip ex ea
+// commodo consequat.
```
+# Internal Options
+
## `emit_mode`
Internal option
## `make_backup`
Internal option, use `--backup`
+
+## `print_misformatted_file_names`
+
+Internal option, use `-l` or `--files-with-diff`
projects / rust.git / blobdiff