-#![allow(default_hash_types)]
+#![allow(rustc::default_hash_types)]
use std::borrow::Cow;
use std::cmp::Ordering;
use crate::consts::{constant, Constant};
use crate::utils::paths;
use crate::utils::{
- clip, comparisons, differing_macro_contexts, higher, in_constant, in_macro_or_desugar, int_bits, last_path_segment,
- match_def_path, match_path, multispan_sugg, same_tys, sext, snippet, snippet_opt, snippet_with_applicability,
- span_help_and_lint, span_lint, span_lint_and_sugg, span_lint_and_then, unsext,
+ clip, comparisons, differing_macro_contexts, higher, in_constant, int_bits, last_path_segment, match_def_path,
+ match_path, multispan_sugg, same_tys, sext, snippet, snippet_opt, snippet_with_applicability,
+ snippet_with_macro_callsite, span_help_and_lint, span_lint, span_lint_and_sugg, span_lint_and_then, unsext,
};
declare_clippy_lint! {
///
/// **Example:**
/// ```rust
- /// let x = LinkedList::new();
+ /// # use std::collections::LinkedList;
+ /// let x: LinkedList<usize> = LinkedList::new();
/// ```
pub LINKEDLIST,
pedantic,
/// local bindings should only be checked for the `BORROWED_BOX` lint.
#[allow(clippy::too_many_lines)]
fn check_ty(cx: &LateContext<'_, '_>, hir_ty: &hir::Ty, is_local: bool) {
- if in_macro_or_desugar(hir_ty.span) {
+ if hir_ty.span.from_expansion() {
return;
}
match hir_ty.node {
fn check_stmt(&mut self, cx: &LateContext<'a, 'tcx>, stmt: &'tcx Stmt) {
if let StmtKind::Local(ref local) = stmt.node {
if is_unit(cx.tables.pat_ty(&local.pat)) {
- if in_external_macro(cx.sess(), stmt.span) || in_macro_or_desugar(local.pat.span) {
+ if in_external_macro(cx.sess(), stmt.span) || local.pat.span.from_expansion() {
return;
}
if higher::is_from_for_desugar(local) {
return;
}
- span_lint(
- cx,
- LET_UNIT_VALUE,
- stmt.span,
- &format!(
- "this let-binding has unit value. Consider omitting `let {} =`",
- snippet(cx, local.pat.span, "..")
- ),
- );
+ span_lint_and_then(cx, LET_UNIT_VALUE, stmt.span, "this let-binding has unit value", |db| {
+ if let Some(expr) = &local.init {
+ let snip = snippet_with_macro_callsite(cx, expr.span, "()");
+ db.span_suggestion(
+ stmt.span,
+ "omit the `let` binding",
+ format!("{};", snip),
+ Applicability::MachineApplicable, // snippet
+ );
+ }
+ });
}
}
}
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnitCmp {
fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
- if in_macro_or_desugar(expr.span) {
+ if expr.span.from_expansion() {
return;
}
if let ExprKind::Binary(ref cmp, ref left, _) = expr.node {
/// **Known problems:** None.
///
/// **Example:**
- /// ```rust
+ /// ```rust,ignore
/// foo({
/// let a = bar();
/// baz(a);
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnitArg {
fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
- if in_macro_or_desugar(expr.span) {
+ if expr.span.from_expansion() {
return;
}
}
fn is_questionmark_desugar_marked_call(expr: &Expr) -> bool {
- use syntax_pos::hygiene::CompilerDesugaringKind;
+ use syntax_pos::hygiene::DesugaringKind;
if let ExprKind::Call(ref callee, _) = expr.node {
- callee.span.is_compiler_desugaring(CompilerDesugaringKind::QuestionMark)
+ callee.span.is_desugaring(DesugaringKind::QuestionMark)
} else {
false
}
///
/// **Example:**
/// ```rust
- /// let x = u64::MAX;
- /// x as f64
+ /// let x = std::u64::MAX;
+ /// x as f64;
/// ```
pub CAST_PRECISION_LOSS,
pedantic,
/// **Example:**
/// ```rust
/// let y: i8 = -1;
- /// y as u128 // will return 18446744073709551615
+ /// y as u128; // will return 18446744073709551615
/// ```
pub CAST_SIGN_LOSS,
pedantic,
}
declare_clippy_lint! {
- /// **What it does:** Checks for on casts between numerical types that may
+ /// **What it does:** Checks for casts between numerical types that may
/// truncate large values. This is expected behavior, so the cast is `Allow` by
/// default.
///
///
/// **Example:**
/// ```rust
- /// u32::MAX as i32 // will yield a value of `-1`
+ /// std::u32::MAX as i32; // will yield a value of `-1`
/// ```
pub CAST_POSSIBLE_WRAP,
pedantic,
}
declare_clippy_lint! {
- /// **What it does:** Checks for on casts between numerical types that may
+ /// **What it does:** Checks for casts between numerical types that may
/// be replaced by safe conversion functions.
///
/// **Why is this bad?** Rust's `as` keyword will perform many kinds of
///
/// **Example:**
/// ```rust
- /// let _ = 2i32 as i32
+ /// let _ = 2i32 as i32;
/// ```
pub UNNECESSARY_CAST,
complexity,
/// **Why is this bad?** Dereferencing the resulting pointer may be undefined
/// behavior.
///
- /// **Known problems:** None.
+ /// **Known problems:** Using `std::ptr::read_unaligned` and `std::ptr::write_unaligned` or similar
+ /// on the resulting pointer is fine.
///
/// **Example:**
/// ```rust
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Casts {
fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
- if in_macro_or_desugar(expr.span) {
+ if expr.span.from_expansion() {
return;
}
if let ExprKind::Cast(ref ex, _) = expr.node {
if_chain! {
if let ty::RawPtr(from_ptr_ty) = &cast_from.sty;
if let ty::RawPtr(to_ptr_ty) = &cast_to.sty;
- if let Some(from_align) = cx.layout_of(from_ptr_ty.ty).ok().map(|a| a.align.abi);
- if let Some(to_align) = cx.layout_of(to_ptr_ty.ty).ok().map(|a| a.align.abi);
- if from_align < to_align;
+ if let Ok(from_layout) = cx.layout_of(from_ptr_ty.ty);
+ if let Ok(to_layout) = cx.layout_of(to_ptr_ty.ty);
+ if from_layout.align.abi < to_layout.align.abi;
// with c_void, we inherently need to trust the user
if !is_c_void(cx, from_ptr_ty.ty);
+ // when casting from a ZST, we don't know enough to properly lint
+ if !from_layout.is_zst();
then {
span_lint(
cx,
CAST_PTR_ALIGNMENT,
expr.span,
- &format!("casting from `{}` to a more-strictly-aligned pointer (`{}`)", cast_from, cast_to)
+ &format!(
+ "casting from `{}` to a more-strictly-aligned pointer (`{}`) ({} < {} bytes)",
+ cast_from,
+ cast_to,
+ from_layout.align.abi.bytes(),
+ to_layout.align.abi.bytes(),
+ ),
);
}
}
}
match cast_from.sty {
ty::FnDef(..) | ty::FnPtr(_) => {
- let mut applicability = Applicability::MachineApplicable;
+ let mut applicability = Applicability::MaybeIncorrect;
let from_snippet = snippet_with_applicability(cx, cast_expr.span, "x", &mut applicability);
let to_nbits = int_ty_to_nbits(cast_to, cx.tcx);
///
/// **Example:**
/// ```rust
+ /// # use std::rc::Rc;
/// struct Foo {
/// inner: Rc<Vec<Vec<Box<(u32, u32, u32, u32)>>>>,
/// }
fn check_impl_item(&mut self, cx: &LateContext<'a, 'tcx>, item: &'tcx ImplItem) {
match item.node {
- ImplItemKind::Const(ref ty, _) | ImplItemKind::Type(ref ty) => self.check_type(cx, ty),
+ ImplItemKind::Const(ref ty, _) | ImplItemKind::TyAlias(ref ty) => self.check_type(cx, ty),
// methods are covered by check_fn
_ => (),
}
}
fn check_type(&self, cx: &LateContext<'_, '_>, ty: &hir::Ty) {
- if in_macro_or_desugar(ty.span) {
+ if ty.span.from_expansion() {
return;
}
let score = {
/// **Known problems:** None.
///
/// **Example:**
- /// ```rust
+ /// ```rust,ignore
/// 'x' as u8
/// ```
///
/// A better version, using the byte literal:
///
- /// ```rust
+ /// ```rust,ignore
/// b'x'
/// ```
pub CHAR_LIT_AS_U8,
if let ExprKind::Cast(ref e, _) = expr.node {
if let ExprKind::Lit(ref l) = e.node {
if let LitKind::Char(_) = l.node {
- if ty::Uint(UintTy::U8) == cx.tables.expr_ty(expr).sty && !in_macro_or_desugar(expr.span) {
+ if ty::Uint(UintTy::U8) == cx.tables.expr_ty(expr).sty && !expr.span.from_expansion() {
let msg = "casting character literal to u8. `char`s \
are 4 bytes wide in rust, so casting to u8 \
truncates them";
if let ExprKind::Binary(ref cmp, ref lhs, ref rhs) = expr.node {
if let Some((culprit, result)) = detect_absurd_comparison(cx, cmp.node, lhs, rhs) {
- if !in_macro_or_desugar(expr.span) {
+ if !expr.span.from_expansion() {
let msg = "this comparison involving the minimum or maximum element for this \
type contains a case that is always true or always false";
///
/// **Example:**
/// ```rust
- /// let x : u8 = ...; (x as u32) > 300
+ /// let x: u8 = 1;
+ /// (x as u32) > 300;
/// ```
pub INVALID_UPCAST_COMPARISONS,
pedantic,
impl PartialOrd for FullInt {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(match (self, other) {
- (&FullInt::S(s), &FullInt::S(o)) => s.cmp(&o),
- (&FullInt::U(s), &FullInt::U(o)) => s.cmp(&o),
- (&FullInt::S(s), &FullInt::U(o)) => Self::cmp_s_u(s, o),
- (&FullInt::U(s), &FullInt::S(o)) => Self::cmp_s_u(o, s).reverse(),
+ (&Self::S(s), &Self::S(o)) => s.cmp(&o),
+ (&Self::U(s), &Self::U(o)) => s.cmp(&o),
+ (&Self::S(s), &Self::U(o)) => Self::cmp_s_u(s, o),
+ (&Self::U(s), &Self::S(o)) => Self::cmp_s_u(o, s).reverse(),
})
}
}
/// **Example:**
/// ```rust
/// # use std::collections::HashMap;
- /// # use std::hash::Hash;
+ /// # use std::hash::{Hash, BuildHasher};
/// # trait Serialize {};
/// impl<K: Hash + Eq, V> Serialize for HashMap<K, V> { }
///
/// pub fn foo(map: &mut HashMap<i32, i32>) { }
/// ```
+ /// could be rewritten as
+ /// ```rust
+ /// # use std::collections::HashMap;
+ /// # use std::hash::{Hash, BuildHasher};
+ /// # trait Serialize {};
+ /// impl<K: Hash + Eq, V, S: BuildHasher> Serialize for HashMap<K, V, S> { }
+ ///
+ /// pub fn foo<S: BuildHasher>(map: &mut HashMap<i32, i32, S>) { }
+ /// ```
pub IMPLICIT_HASHER,
style,
"missing generalization over different hashers"
vis.visit_ty(ty);
for target in &vis.found {
+ if in_external_macro(cx.sess(), generics.span) {
+ continue;
+ }
let generics_suggestion_span = generics.span.substitute_dummy({
- let pos = snippet_opt(cx, item.span.until(body.arguments[0].pat.span))
+ let pos = snippet_opt(cx, item.span.until(body.params[0].pat.span))
.and_then(|snip| {
let i = snip.find("fn")?;
Some(item.span.lo() + BytePos((i + (&snip[i..]).find('(')?) as u32))
projects / rust.git / blobdiff