Auto merge of rust-lang#10106 - koka831:fix/10084, r=Alexendoo

Fix FP in `unnecessary_safety_comment`

Fix rust-lang/rust-clippy#10084

changelog: FP: [`unnecessary_safety_comment`]: No longer lints code inside macros
[rust-lang#10106](rust-lang/rust-clippy#10106)
<!-- changelog_checked -->

Author: bors

clippy_lints/src/undocumented_unsafe_blocks.rs

@@ -263,6 +263,18 @@ fn expr_has_unnecessary_safety_comment<'tcx>(
     expr: &'tcx hir::Expr<'tcx>,
     comment_pos: BytePos,
 ) -> Option<Span> {
+    if cx.tcx.hir().parent_iter(expr.hir_id).any(|(_, ref node)| {
+        matches!(
+            node,
+            Node::Block(&Block {
+                rules: BlockCheckMode::UnsafeBlock(UnsafeSource::UserProvided),
+                ..
+            }),
+        )
+    }) {
+        return None;
+    }
+
     // this should roughly be the reverse of `block_parents_have_safety_comment`
     if for_each_expr_with_closures(cx, expr, |expr| match expr.kind {
         hir::ExprKind::Block(

tests/ui/unnecessary_safety_comment.rs

@@ -48,4 +48,21 @@ fn unnecessary_on_stmt_and_expr() -> u32 {
     24
 }
 
+mod issue_10084 {
+    unsafe fn bar() -> i32 {
+        42
+    }
+
+    macro_rules! foo {
+        () => {
+            // SAFETY: This is necessary
+            unsafe { bar() }
+        };
+    }
+
+    fn main() {
+        foo!();
+    }
+}
+
 fn main() {}