julia

226a4ec1 - Indirect checking for return_type through an extra function (#26836)

Indirect checking for return_type through an extra function (#26836) Compiler.return_type is a bit of an odd beast because we basically treat it like a built-in, but it's defined in the compiler. When working on inference, it can be useful to load a second copy of inference with the new changes (e.g. to test changes before the changes are capable of running correctly on all input). This works quite well, but was causing problems with return type, because Base's notion of return_type and the second inference copy's notion of return_type were different. This patch adds a simple is_return_type(f) predicate that we can overload in our second inference copy in order to make it recognize both Core.Compiler.return_type and return_type (from the second copy's perspective as the return_type builtin).