fix: don't lint in macro calls

Author: ada4a

clippy_lints/src/mut_mut.rs

@@ -72,6 +72,9 @@ impl<'tcx> intravisit::Visitor<'tcx> for MutVisitor<'_, 'tcx> {
             intravisit::walk_expr(self, body);
         } else if let hir::ExprKind::AddrOf(hir::BorrowKind::Ref, hir::Mutability::Mut, e) = expr.kind {
             if let hir::ExprKind::AddrOf(hir::BorrowKind::Ref, hir::Mutability::Mut, _) = e.kind {
+                if !expr.span.eq_ctxt(e.span) {
+                    return;
+                }
                 let mut applicability = Applicability::MaybeIncorrect;
                 let sugg = Sugg::hir_with_applicability(self.cx, e, "..", &mut applicability);
                 span_lint_hir_and_then(

tests/ui/mut_mut.fixed

@@ -49,8 +49,7 @@ fn main() {
         //~| mut_mut
     }
 
-    let mut z = inline!(&mut 3u32mut $(&mut 3u32));
-    //~^ mut_mut
+    let mut z = inline!(&mut $(&mut 3u32));
 }
 
 fn issue939() {

tests/ui/mut_mut.rs

@@ -50,7 +50,6 @@ fn main() {
     }
 
     let mut z = inline!(&mut $(&mut 3u32));
-    //~^ mut_mut
 }
 
 fn issue939() {

tests/ui/mut_mut.stderr

@@ -13,14 +13,6 @@ error: an expression of form `&mut &mut _`
 LL |     let mut x = &mut &mut 1u32;
    |                 ^^^^^^^^^^^^^^ help: remove the extra `&mut`: `&mut 1u32`
 
-error: an expression of form `&mut &mut _`
-  --> tests/ui/mut_mut.rs:52:25
-   |
-LL |     let mut z = inline!(&mut $(&mut 3u32));
-   |                         ^ help: remove the extra `&mut`: `&mut 3u32`
-   |
-   = note: this error originates in the macro `__inline_mac_fn_main` (in Nightly builds, run with -Z macro-backtrace for more info)
-
 error: this expression mutably borrows a mutable reference
   --> tests/ui/mut_mut.rs:35:21
    |
@@ -57,5 +49,5 @@ error: generally you want to avoid `&mut &mut _` if possible
 LL |         let y: &mut &mut &mut u32 = &mut &mut &mut 2;
    |                     ^^^^^^^^^^^^^
 
-error: aborting due to 9 previous errors
+error: aborting due to 8 previous errors