Account for macros

Author: estebank

compiler/rustc_passes/src/loops.rs

@@ -231,7 +231,7 @@ impl<'a, 'hir> CheckLoopVisitor<'a, 'hir> {
             AsyncClosure(closure_span) => {
                 self.sess.emit_err(BreakInsideAsyncBlock { span, closure_span, name });
             }
-            UnlabeledBlock(block_span) if is_break => {
+            UnlabeledBlock(block_span) if is_break && block_span.ctxt() == break_span.ctxt() => {
                 let suggestion = Some(OutsideLoopSuggestion { block_span, break_span });
                 self.sess.emit_err(OutsideLoop { span, name, is_break, suggestion });
             }

tests/ui/parser/break-in-unlabeled-block-in-macro.rs

@@ -0,0 +1,43 @@
+macro_rules! foo {
+    () => {
+        break (); //~ ERROR `break` outside of a loop or labeled block
+    };
+    ($e: expr) => {
+        break $e; //~ ERROR `break` outside of a loop or labeled block
+    };
+    (stmt $s: stmt) => {
+        $s
+    };
+    (@ $e: expr) => {
+        { break $e; } //~ ERROR `break` outside of a loop or labeled block
+    };
+    (=> $s: stmt) => {
+        { $s }
+    };
+}
+
+fn main() {
+    {
+        foo!();
+    }
+    {
+        foo!(());
+    }
+    {
+        foo!(stmt break ()); //~ ERROR `break` outside of a loop or labeled block
+    }
+    {
+        foo!(@ ());
+    }
+    {
+        foo!(=> break ()); //~ ERROR `break` outside of a loop or labeled block
+    }
+    {
+        macro_rules! bar {
+            () => {
+                break () //~ ERROR `break` outside of a loop or labeled block
+            };
+        }
+        bar!()
+    }
+}

tests/ui/parser/break-in-unlabeled-block-in-macro.stderr

@@ -0,0 +1,69 @@
+error[E0268]: `break` outside of a loop or labeled block
+  --> $DIR/break-in-unlabeled-block-in-macro.rs:3:9
+   |
+LL |         break ();
+   |         ^^^^^^^^ cannot `break` outside of a loop or labeled block
+...
+LL |         foo!();
+   |         ------ in this macro invocation
+   |
+   = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0268]: `break` outside of a loop or labeled block
+  --> $DIR/break-in-unlabeled-block-in-macro.rs:6:9
+   |
+LL |         break $e;
+   |         ^^^^^^^^ cannot `break` outside of a loop or labeled block
+...
+LL |         foo!(());
+   |         -------- in this macro invocation
+   |
+   = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0268]: `break` outside of a loop or labeled block
+  --> $DIR/break-in-unlabeled-block-in-macro.rs:27:19
+   |
+LL |         foo!(stmt break ());
+   |                   ^^^^^^^^ cannot `break` outside of a loop or labeled block
+   |
+help: consider labeling this block to be able to break within it
+   |
+LL ~     'block: {
+LL ~         foo!(stmt break 'block ());
+   |
+
+error[E0268]: `break` outside of a loop or labeled block
+  --> $DIR/break-in-unlabeled-block-in-macro.rs:12:11
+   |
+LL |         { break $e; }
+   |           ^^^^^^^^ cannot `break` outside of a loop or labeled block
+...
+LL |         foo!(@ ());
+   |         ---------- in this macro invocation
+   |
+   = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider labeling this block to be able to break within it
+   |
+LL |         'block: { break 'block $e; }
+   |         +++++++         ++++++
+
+error[E0268]: `break` outside of a loop or labeled block
+  --> $DIR/break-in-unlabeled-block-in-macro.rs:33:17
+   |
+LL |         foo!(=> break ());
+   |                 ^^^^^^^^ cannot `break` outside of a loop or labeled block
+
+error[E0268]: `break` outside of a loop or labeled block
+  --> $DIR/break-in-unlabeled-block-in-macro.rs:38:17
+   |
+LL |                 break ()
+   |                 ^^^^^^^^ cannot `break` outside of a loop or labeled block
+...
+LL |         bar!()
+   |         ------ in this macro invocation
+   |
+   = note: this error originates in the macro `bar` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to 6 previous errors
+
+For more information about this error, try `rustc --explain E0268`.