Be more careful when getting the effective thrown error type

DougGregor · DougGregor · commit 7b9c079a52bb · 2023-10-16T01:12:04.000-07:00
diff --git a/lib/AST/Decl.cpp b/lib/AST/Decl.cpp
@@ -963,8 +963,10 @@ AbstractFunctionDecl::getEffectiveThrownErrorType() const {
       interfaceType = fnType->getResult();
   }
 
-  return interfaceType->castTo<AnyFunctionType>()
-      ->getEffectiveThrownErrorType();
+  if (auto fnType = interfaceType->getAs<AnyFunctionType>())
+    return fnType->getEffectiveThrownErrorType();
+
+  return llvm::None;
 }
 
 Expr *AbstractFunctionDecl::getSingleExpressionBody() const {

Original file line number	Diff line number	Diff line change
`@@ -963,8 +963,10 @@ AbstractFunctionDecl::getEffectiveThrownErrorType() const {`
`963`	`963`	`interfaceType = fnType->getResult();`
`964`	`964`	`}`
`965`	`965`
`966`		`- return interfaceType->castTo<AnyFunctionType>()`
`967`		`- ->getEffectiveThrownErrorType();`
	`966`	`+ if (auto fnType = interfaceType->getAs<AnyFunctionType>())`
	`967`	`+ return fnType->getEffectiveThrownErrorType();`
	`968`	`+`
	`969`	`+ return llvm::None;`
`968`	`970`	`}`
`969`	`971`
`970`	`972`	`Expr *AbstractFunctionDecl::getSingleExpressionBody() const {`