address comments

Author: usx95

clang/include/clang/Basic/AttrDocs.td

@@ -3921,9 +3921,9 @@ have their lifetimes extended.
 def LifetimeCaptureByDocs : Documentation {
   let Category = DocCatFunction;
   let Content = [{
-    Similar to `lifetimebound`_, the ``lifetime_capture_by(X)`` attribute on a function
-parameter or implicit object parameter indicates that the capturing entity
-``X`` may refer to the object referred by that parameter.
+Similar to `lifetimebound`_, the ``lifetime_capture_by(X)`` attribute on a
+function parameter or implicit object parameter indicates that the capturing
+entity ``X`` may refer to the object referred by that parameter.
 
 Below is a list of types of the parameters and what they're considered to refer to:
 

clang/lib/Sema/CheckExprLifetime.cpp

@@ -1491,10 +1491,13 @@ void checkAssignmentLifetime(Sema &SemaRef, const AssignedEntity &Entity,
 
 void checkCaptureByLifetime(Sema &SemaRef, const CapturingEntity &Entity,
                             Expr *Init) {
-  return checkExprLifetimeImpl(SemaRef, /*InitEntity=*/nullptr,
-                               /*ExtendingEntity=*/nullptr, LK_LifetimeCapture,
-                               /*AEntity=*/nullptr,
-                               /*CapEntity=*/&Entity, Init);
+  if (!SemaRef.getDiagnostics().isIgnored(
+          diag::warn_dangling_reference_captured, SourceLocation()))
+    return checkExprLifetimeImpl(SemaRef, /*InitEntity=*/nullptr,
+                                 /*ExtendingEntity=*/nullptr,
+                                 LK_LifetimeCapture,
+                                 /*AEntity=*/nullptr,
+                                 /*CapEntity=*/&Entity, Init);
 }
 
 } // namespace clang::sema