Doug twisted my arm and convinced me that noescape was a better match for the semantics we’ll have here. NoCapture would be confusable with "this closure doesn’t have any captures, thus should be compatible with thin function types"

The attribute itself remains __'ized.



Swift SVN r24113

lib/Serialization/Serialization.cpp

@@ -2381,7 +2381,7 @@ void Serializer::writeType(Type ty) {
            fnTy->getRepresentation() == AnyFunctionType::Representation::Thin,
            fnTy->isNoReturn(),
            fnTy->getRepresentation() == AnyFunctionType::Representation::Block,
-                                   fnTy->isNoCapture());
+                                   fnTy->isNoEscape());
     break;
   }