/// }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_on_unimplemented = "`{Self}` cannot be formatted using `:?`; if it is \
- defined in your crate, add `#[derive(Debug)]` or \
- manually implement it"]
+#[rustc_on_unimplemented(
+ on(crate_local, label="`{Self}` cannot be formatted using `:?`; \
+ add `#[derive(Debug)]` or manually implement `{Debug}`"),
+ message="`{Self}` doesn't implement `{Debug}`",
+ label="`{Self}` cannot be formatted using `:?` because it doesn't implement `{Debug}`",
+)]
#[lang = "debug_trait"]
pub trait Debug {
/// Formats the value using the given formatter.
///
/// println!("The origin is: {}", origin);
/// ```
-#[rustc_on_unimplemented = "`{Self}` cannot be formatted with the default \
- formatter; try using `:?` instead if you are using \
- a format string"]
+#[rustc_on_unimplemented(
+ message="`{Self}` doesn't implement `{Display}`",
+ label="`{Self}` cannot be formatted with the default formatter; \
+ try using `:?` instead if you are using a format string",
+)]
#[stable(feature = "rust1", since = "1.0.0")]
pub trait Display {
/// Formats the value using the given formatter.
/// [module-level documentation]: index.html
/// [impl]: index.html#implementing-iterator
#[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_on_unimplemented = "`{Self}` is not an iterator; maybe try calling \
- `.iter()` or a similar method"]
+#[rustc_on_unimplemented(
+ on(
+ _Self="&str",
+ label="`{Self}` is not an iterator; try calling `.chars()` or `.bytes()`"
+ ),
+ label="`{Self}` is not an iterator; maybe try calling `.iter()` or a similar method"
+)]
#[doc(spotlight)]
pub trait Iterator {
/// The type of the elements being iterated over.
Some(ty_str.clone())));
}
+ if let Some(true) = self_ty.ty_to_def_id().map(|def_id| def_id.is_local()) {
+ flags.push(("crate_local".to_string(), None));
+ }
+
if let Ok(Some(command)) = OnUnimplementedDirective::of_item(
self.tcx, trait_ref.def_id, def_id
) {
let mut message = None;
let mut label = None;
let mut note = None;
- info!("evaluate({:?}, trait_ref={:?}, options={:?})",
- self, trait_ref, options);
+ info!("evaluate({:?}, trait_ref={:?}, options={:?})", self, trait_ref, options);
for command in self.subcommands.iter().chain(Some(self)).rev() {
if let Some(ref condition) = command.condition {
0
} else {
n + sum_to(n - 1)
- //~^ ERROR the trait bound `u32: std::ops::Add<impl Foo>` is not satisfied
+ //~^ ERROR cannot add `impl Foo` to `u32`
}
}
"message": "cannot find type `Iter` in this scope",
"code": {
"code": "E0412",
- "explanation": null
+ "explanation": "
+The type name used is not in scope.
+
+Erroneous code examples:
+
+```compile_fail,E0412
+impl Something {} // error: type name `Something` is not in scope
+
+// or:
+
+trait Foo {
+ fn bar(N); // error: type name `N` is not in scope
+}
+
+// or:
+
+fn foo(x: T) {} // type name `T` is not in scope
+```
+
+To fix this error, please verify you didn't misspell the type name, you did
+declare it or imported it into the scope. Examples:
+
+```
+struct Something;
+
+impl Something {} // ok!
+
+// or:
+
+trait Foo {
+ type N;
+
+ fn bar(_: Self::N); // ok!
+}
+
+// or:
+
+fn foo<T>(x: T) {} // ok!
+```
+
+Another case that causes this error is when a type is imported into a parent
+module. To fix this, you can follow the suggestion and use File directly or
+`use super::File;` which will import the types from the parent namespace. An
+example that causes this error is below:
+
+```compile_fail,E0412
+use std::fs::File;
+
+mod foo {
+ fn some_function(f: File) {}
+}
+```
+
+```
+use std::fs::File;
+
+mod foo {
+ // either
+ use super::File;
+ // or
+ // use std::fs::File;
+ fn foo(f: File) {}
+}
+# fn main() {} // don't insert it for us; that'll break imports
+```
+"
},
"level": "error",
"spans": [
// except according to those terms.
fn main() {
- 1 + Some(1); //~ ERROR is not satisfied
- 2 as usize - Some(1); //~ ERROR is not satisfied
- 3 * (); //~ ERROR is not satisfied
- 4 / ""; //~ ERROR is not satisfied
+ 1 + Some(1); //~ ERROR cannot add `std::option::Option<{integer}>` to `{integer}`
+ 2 as usize - Some(1); //~ ERROR cannot substract `std::option::Option<{integer}>` from `usize`
+ 3 * (); //~ ERROR cannot multiply `()` to `{integer}`
+ 4 / ""; //~ ERROR cannot divide `{integer}` by `&str`
5 < String::new(); //~ ERROR is not satisfied
6 == Ok(1); //~ ERROR is not satisfied
}
error[E0277]: cannot add `std::option::Option<{integer}>` to `{integer}`
--> $DIR/binops.rs:12:7
|
-12 | 1 + Some(1); //~ ERROR is not satisfied
+12 | 1 + Some(1); //~ ERROR cannot add `std::option::Option<{integer}>` to `{integer}`
| ^ no implementation for `{integer} + std::option::Option<{integer}>`
|
= help: the trait `std::ops::Add<std::option::Option<{integer}>>` is not implemented for `{integer}`
error[E0277]: cannot substract `std::option::Option<{integer}>` from `usize`
--> $DIR/binops.rs:13:16
|
-13 | 2 as usize - Some(1); //~ ERROR is not satisfied
+13 | 2 as usize - Some(1); //~ ERROR cannot substract `std::option::Option<{integer}>` from `usize`
| ^ no implementation for `usize - std::option::Option<{integer}>`
|
= help: the trait `std::ops::Sub<std::option::Option<{integer}>>` is not implemented for `usize`
error[E0277]: cannot multiply `()` to `{integer}`
--> $DIR/binops.rs:14:7
|
-14 | 3 * (); //~ ERROR is not satisfied
+14 | 3 * (); //~ ERROR cannot multiply `()` to `{integer}`
| ^ no implementation for `{integer} * ()`
|
= help: the trait `std::ops::Mul<()>` is not implemented for `{integer}`
error[E0277]: cannot divide `{integer}` by `&str`
--> $DIR/binops.rs:15:7
|
-15 | 4 / ""; //~ ERROR is not satisfied
+15 | 4 / ""; //~ ERROR cannot divide `{integer}` by `&str`
| ^ no implementation for `{integer} / &str`
|
= help: the trait `std::ops::Div<&str>` is not implemented for `{integer}`
--- /dev/null
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+// ignore-tidy-linelength
+
+#![crate_type = "lib"]
+
+pub struct Bar;
-error[E0277]: trait message `[i32]`
- --> $DIR/multiple-impls-complex-filtering.rs:46:5
+error[E0277]: trait message
+ --> $DIR/multiple-impls-complex-filtering.rs:49:5
|
-46 | Index::index(&[] as &[i32], 2usize);
- | ^^^^^^^^^^^^ u32 message
+49 | Index::index(&[] as &[i32], 2usize);
+ | ^^^^^^^^^^^^ trait label if i32
|
- = help: the trait `Index<_>` is not implemented for `[i32]`
+ = help: the trait `Index<usize>` is not implemented for `[i32]`
note: required by `Index::index`
- --> $DIR/multiple-impls-complex-filtering.rs:25:5
+ --> $DIR/multiple-impls-complex-filtering.rs:26:5
|
-25 | fn index(&self, index: Idx) -> &Self::Output;
+26 | fn index(&self, index: Idx) -> &Self::Output;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-error[E0277]: trait message `[i32]`
- --> $DIR/multiple-impls-complex-filtering.rs:46:5
+error[E0277]: trait message
+ --> $DIR/multiple-impls-complex-filtering.rs:49:5
|
-46 | Index::index(&[] as &[i32], 2usize);
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ u32 message
+49 | Index::index(&[] as &[i32], 2usize);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ trait label if i32
|
- = help: the trait `Index<_>` is not implemented for `[i32]`
+ = help: the trait `Index<usize>` is not implemented for `[i32]`
-error[E0277]: trait message `[i32]`
- --> $DIR/multiple-impls-complex-filtering.rs:47:5
+error[E0277]: trait message
+ --> $DIR/multiple-impls-complex-filtering.rs:50:5
|
-47 | Index::index(&[] as &[i32], 2u32);
- | ^^^^^^^^^^^^ u32 message
+50 | Index::index(&[] as &[i32], 2u32);
+ | ^^^^^^^^^^^^ trait label if i32
|
- = help: the trait `Index<_>` is not implemented for `[i32]`
+ = help: the trait `Index<u32>` is not implemented for `[i32]`
note: required by `Index::index`
- --> $DIR/multiple-impls-complex-filtering.rs:25:5
+ --> $DIR/multiple-impls-complex-filtering.rs:26:5
|
-25 | fn index(&self, index: Idx) -> &Self::Output;
+26 | fn index(&self, index: Idx) -> &Self::Output;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-error[E0277]: trait message `[i32]`
- --> $DIR/multiple-impls-complex-filtering.rs:47:5
+error[E0277]: trait message
+ --> $DIR/multiple-impls-complex-filtering.rs:50:5
|
-47 | Index::index(&[] as &[i32], 2u32);
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ u32 message
+50 | Index::index(&[] as &[i32], 2u32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ trait label if i32
|
- = help: the trait `Index<_>` is not implemented for `[i32]`
+ = help: the trait `Index<u32>` is not implemented for `[i32]`
-error: aborting due to 4 previous errors
+error[E0277]: trait message
+ --> $DIR/multiple-impls-complex-filtering.rs:51:5
+ |
+51 | Index::index(&[] as &[u32], 2u32);
+ | ^^^^^^^^^^^^ trait label
+ |
+ = help: the trait `Index<_>` is not implemented for `[u32]`
+note: required by `Index::index`
+ --> $DIR/multiple-impls-complex-filtering.rs:26:5
+ |
+26 | fn index(&self, index: Idx) -> &Self::Output;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0277]: trait message
+ --> $DIR/multiple-impls-complex-filtering.rs:51:5
+ |
+51 | Index::index(&[] as &[u32], 2u32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ trait label
+ |
+ = help: the trait `Index<_>` is not implemented for `[u32]`
+
+error[E0277]: the trait bound `[i32]: Index<Foo<u32>>` is not satisfied
+ --> $DIR/multiple-impls-complex-filtering.rs:55:5
+ |
+55 | Index::index(&[] as &[i32], Foo(2u32));
+ | ^^^^^^^^^^^^ impl foo [i32] Foo<u32> Index
+ |
+ = help: the trait `Index<Foo<u32>>` is not implemented for `[i32]`
+note: required by `Index::index`
+ --> $DIR/multiple-impls-complex-filtering.rs:26:5
+ |
+26 | fn index(&self, index: Idx) -> &Self::Output;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0277]: the trait bound `[i32]: Index<Foo<u32>>` is not satisfied
+ --> $DIR/multiple-impls-complex-filtering.rs:55:5
+ |
+55 | Index::index(&[] as &[i32], Foo(2u32));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl foo [i32] Foo<u32> Index
+ |
+ = help: the trait `Index<Foo<u32>>` is not implemented for `[i32]`
+
+error[E0277]: the trait bound `[i32]: Index<Bar<u32>>` is not satisfied
+ --> $DIR/multiple-impls-complex-filtering.rs:58:5
+ |
+58 | Index::index(&[] as &[i32], Bar(2u32));
+ | ^^^^^^^^^^^^ on impl for Bar
+ |
+ = help: the trait `Index<Bar<u32>>` is not implemented for `[i32]`
+note: required by `Index::index`
+ --> $DIR/multiple-impls-complex-filtering.rs:26:5
+ |
+26 | fn index(&self, index: Idx) -> &Self::Output;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0277]: the trait bound `[i32]: Index<Bar<u32>>` is not satisfied
+ --> $DIR/multiple-impls-complex-filtering.rs:58:5
+ |
+58 | Index::index(&[] as &[i32], Bar(2u32));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ on impl for Bar
+ |
+ = help: the trait `Index<Bar<u32>>` is not implemented for `[i32]`
+
+error: aborting due to 10 previous errors
--- /dev/null
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// aux-build:no_debug.rs
+
+extern crate no_debug;
+
+use no_debug::Bar;
+
+struct Foo;
+
+fn main() {
+ println!("{:?} {:?}", Foo, Bar);
+ println!("{} {}", Foo, Bar);
+}
+//~^^^ ERROR `Foo` doesn't implement `std::fmt::Debug`
+//~| ERROR `no_debug::Bar` doesn't implement `std::fmt::Debug`
+//~^^^^ ERROR `Foo` doesn't implement `std::fmt::Display`
+//~| ERROR `no_debug::Bar` doesn't implement `std::fmt::Display`
+
--- /dev/null
+error[E0277]: `Foo` doesn't implement `std::fmt::Debug`
+ --> $DIR/no-debug.rs:20:27
+ |
+20 | println!("{:?} {:?}", Foo, Bar);
+ | ^^^ `Foo` cannot be formatted using `:?`; add `#[derive(Debug)]` or manually implement `std::fmt::Debug`
+ |
+ = help: the trait `std::fmt::Debug` is not implemented for `Foo`
+ = note: required by `std::fmt::Debug::fmt`
+
+error[E0277]: `no_debug::Bar` doesn't implement `std::fmt::Debug`
+ --> $DIR/no-debug.rs:20:32
+ |
+20 | println!("{:?} {:?}", Foo, Bar);
+ | ^^^ `no_debug::Bar` cannot be formatted using `:?` because it doesn't implement `std::fmt::Debug`
+ |
+ = help: the trait `std::fmt::Debug` is not implemented for `no_debug::Bar`
+ = note: required by `std::fmt::Debug::fmt`
+
+error[E0277]: `Foo` doesn't implement `std::fmt::Display`
+ --> $DIR/no-debug.rs:21:23
+ |
+21 | println!("{} {}", Foo, Bar);
+ | ^^^ `Foo` cannot be formatted with the default formatter; try using `:?` instead if you are using a format string
+ |
+ = help: the trait `std::fmt::Display` is not implemented for `Foo`
+ = note: required by `std::fmt::Display::fmt`
+
+error[E0277]: `no_debug::Bar` doesn't implement `std::fmt::Display`
+ --> $DIR/no-debug.rs:21:28
+ |
+21 | println!("{} {}", Foo, Bar);
+ | ^^^ `no_debug::Bar` cannot be formatted with the default formatter; try using `:?` instead if you are using a format string
+ |
+ = help: the trait `std::fmt::Display` is not implemented for `no_debug::Bar`
+ = note: required by `std::fmt::Display::fmt`
+
+error: aborting due to 4 previous errors
+
let x = 1;
let y = 2;
let z = 3;
- foo(1 as u32 + //~ ERROR not satisfied
+ foo(1 as u32 + //~ ERROR cannot add `()` to `u32`
bar(x,
error[E0277]: cannot add `()` to `u32`
--> $DIR/multiline-span-simple.rs:23:18
|
-23 | foo(1 as u32 + //~ ERROR not satisfied
+23 | foo(1 as u32 + //~ ERROR cannot add `()` to `u32`
| ^ no implementation for `u32 + ()`
|
= help: the trait `std::ops::Add<()>` is not implemented for `u32`
--- /dev/null
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn main() {
+ for c in "foobarbaz" {
+ println!("{}", c);
+ }
+ //~^^^ ERROR the trait bound `&str: std::iter::Iterator` is not satisfied
+ //~| NOTE `&str` is not an iterator; try calling `.chars()` or `.bytes()`
+ //~| HELP the trait `std::iter::Iterator` is not implemented for `&str`
+ //~| NOTE required by `std::iter::IntoIterator::into_iter`
+}
--- /dev/null
+error[E0277]: the trait bound `&str: std::iter::Iterator` is not satisfied
+ --> $DIR/iterate-str.rs:12:5
+ |
+12 | / for c in "foobarbaz" {
+13 | | println!("{}", c);
+14 | | }
+ | |_____^ `&str` is not an iterator; try calling `.chars()` or `.bytes()`
+ |
+ = help: the trait `std::iter::Iterator` is not implemented for `&str`
+ = note: required by `std::iter::IntoIterator::into_iter`
+
+error: aborting due to previous error
+
projects / rust.git / commitdiff