Prevent casting null pointer

stzn · stzn · commit c0e82eca51b6 · 2025-04-22T20:55:50.000+09:00
diff --git a/lib/Sema/TypeCheckConcurrency.h b/lib/Sema/TypeCheckConcurrency.h
@@ -459,8 +459,9 @@ bool diagnoseNonSendableTypesWithSendingCheck(
       return false;
   }
   if (auto *subscript = dyn_cast<SubscriptDecl>(decl)) {
-    if (isa<SendingTypeRepr>(subscript->getResultTypeRepr()))
-      return false;
+    if (auto resultTypeRepr = subscript->getResultTypeRepr())
+      if (isa<SendingTypeRepr>(resultTypeRepr))
+        return false;
   }
 
   return diagnoseNonSendableTypes(

Original file line number	Diff line number	Diff line change
`@@ -459,8 +459,9 @@ bool diagnoseNonSendableTypesWithSendingCheck(`
`459`	`459`	`return false;`
`460`	`460`	`}`
`461`	`461`	`if (auto *subscript = dyn_cast<SubscriptDecl>(decl)) {`
`462`		`- if (isa<SendingTypeRepr>(subscript->getResultTypeRepr()))`
`463`		`- return false;`
	`462`	`+ if (auto resultTypeRepr = subscript->getResultTypeRepr())`
	`463`	`+ if (isa<SendingTypeRepr>(resultTypeRepr))`
	`464`	`+ return false;`
`464`	`465`	`}`
`465`	`466`
`466`	`467`	`return diagnoseNonSendableTypes(`