Auto merge of #4551 - mikerite:fix-ice-reporting, r=llogiq

[rust.git] / clippy_lints / src / mut_mut.rs

diff --git a/clippy_lints/src/mut_mut.rs b/clippy_lints/src/mut_mut.rs
index f3918f542df33fb2e45d2d183c329be79f83aa55..decc684b66778bc5b1e022f1f2efc89fb5073afa 100644 (file)
--- a/clippy_lints/src/mut_mut.rs
+++ b/clippy_lints/src/mut_mut.rs
@@ -1,36 +1,30 @@
+use crate::utils::{higher, span_lint};
 use rustc::hir;
 use rustc::hir::intravisit;
-use rustc::lint::*;
-use rustc::{declare_lint, lint_array};
+use rustc::lint::{in_external_macro, LateContext, LateLintPass, LintArray, LintContext, LintPass};
 use rustc::ty;
-use crate::utils::{higher, in_external_macro, span_lint};
+use rustc::{declare_lint_pass, declare_tool_lint};
 
-/// **What it does:** Checks for instances of `mut mut` references.
-///
-/// **Why is this bad?** Multiple `mut`s don't add anything meaningful to the
-/// source. This is either a copy'n'paste error, or it shows a fundamental
-/// misunderstanding of references.
-///
-/// **Known problems:** None.
-///
-/// **Example:**
-/// ```rust
-/// let x = &mut &mut y;
-/// ```
 declare_clippy_lint! {
+    /// **What it does:** Checks for instances of `mut mut` references.
+    ///
+    /// **Why is this bad?** Multiple `mut`s don't add anything meaningful to the
+    /// source. This is either a copy'n'paste error, or it shows a fundamental
+    /// misunderstanding of references.
+    ///
+    /// **Known problems:** None.
+    ///
+    /// **Example:**
+    /// ```rust
+    /// # let mut y = 1;
+    /// let x = &mut &mut y;
+    /// ```
     pub MUT_MUT,
     pedantic,
-    "usage of double-mut refs, e.g. `&mut &mut ...`"
+    "usage of double-mut refs, e.g., `&mut &mut ...`"
 }
 
-#[derive(Copy, Clone)]
-pub struct MutMut;
-
-impl LintPass for MutMut {
-    fn get_lints(&self) -> LintArray {
-        lint_array!(MUT_MUT)
-    }
-}
+declare_lint_pass!(MutMut => [MUT_MUT]);
 
 impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MutMut {
     fn check_block(&mut self, cx: &LateContext<'a, 'tcx>, block: &'tcx hir::Block) {
@@ -44,13 +38,13 @@ fn check_ty(&mut self, cx: &LateContext<'a, 'tcx>, ty: &'tcx hir::Ty) {
     }
 }
 
-pub struct MutVisitor<'a, 'tcx: 'a> {
+pub struct MutVisitor<'a, 'tcx> {
     cx: &'a LateContext<'a, 'tcx>,
 }
 
 impl<'a, 'tcx> intravisit::Visitor<'tcx> for MutVisitor<'a, 'tcx> {
     fn visit_expr(&mut self, expr: &'tcx hir::Expr) {
-        if in_external_macro(self.cx, expr.span) {
+        if in_external_macro(self.cx.sess(), expr.span) {
             return;
         }
 
@@ -71,12 +65,7 @@ fn visit_expr(&mut self, expr: &'tcx hir::Expr) {
                     expr.span,
                     "generally you want to avoid `&mut &mut _` if possible",
                 );
-            } else if let ty::TyRef(
-                _,
-                _,
-                hir::MutMutable,
-            ) = self.cx.tables.expr_ty(e).sty
-            {
+            } else if let ty::Ref(_, _, hir::MutMutable) = self.cx.tables.expr_ty(e).sty {
                 span_lint(
                     self.cx,
                     MUT_MUT,
@@ -99,8 +88,7 @@ fn visit_ty(&mut self, ty: &'tcx hir::Ty) {
             if let hir::TyKind::Rptr(
                 _,
                 hir::MutTy {
-                    mutbl: hir::MutMutable,
-                    ..
+                    mutbl: hir::MutMutable, ..
                 },
             ) = pty.node
             {