[typechecker] use castTo() instead of getAs()

Suyash Srijan · Suyash Srijan · commit a493934c58a9 · 2019-03-05T21:00:23.000Z
diff --git a/lib/Sema/TypeCheckConstraints.cpp b/lib/Sema/TypeCheckConstraints.cpp
@@ -3908,8 +3908,8 @@ CheckedCastKind TypeChecker::typeCheckCheckedCast(Type fromType,
 
   auto toConstrainedArchetype = false;
   if (toArchetypeType) {
-    auto archetype = toType->getAs<ArchetypeType>();
-    toConstrainedArchetype = !archetype->getConformsTo().empty();
+    auto archetype = toType->castTo<ArchetypeType>();
+    toConstrainedArchetype = archetype && !archetype->getConformsTo().empty();
   }
 
   if (fromFunctionType &&

Original file line number	Diff line number	Diff line change
`@@ -3908,8 +3908,8 @@ CheckedCastKind TypeChecker::typeCheckCheckedCast(Type fromType,`
`3908`	`3908`
`3909`	`3909`	`auto toConstrainedArchetype = false;`
`3910`	`3910`	`if (toArchetypeType) {`
`3911`		`- auto archetype = toType->getAs<ArchetypeType>();`
`3912`		`- toConstrainedArchetype = !archetype->getConformsTo().empty();`
	`3911`	`+ auto archetype = toType->castTo<ArchetypeType>();`
	`3912`	`+ toConstrainedArchetype = archetype && !archetype->getConformsTo().empty();`
`3913`	`3913`	`}`
`3914`	`3914`
`3915`	`3915`	`if (fromFunctionType &&`