This creates a ReturnExpression. A separate change should enforce that an implicit return of `()` is only allowed in functions that have an implicit return type of `()`, and I think the structure taken here should ease that.
- In pre-commit-config, add a run of `--update_list`. I'm doing this because I noticed (on running tests.py) that we'd lost track of a few tests.
- In tests.py, the paths affect bison output where the path to the file is mentioned. This shift should make `--update_goldens` more reliable.
`Pattern` is intended to pilot some changes I would like to apply to all our sum types:
- The alternatives are expressed as derived classes rather than members of a `std::variant`.
- The alternatives are classes in the [style guide sense](https://google.github.io/styleguide/cppguide.html#Structs_vs._Classes), meaning they can have invariants, but can't have public data members.
- Creating an object is expressed using a constructor rather than a factory function.
- Accessing an alternative is expressed as a cast (using LLVM's RTTI system) rather than `std::get` or a `Get` method.
Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
Trying to simplify the process of updating golden output, and ensuring that we aren't missing any tests. With this script, it should be roughly "Add the .carbon file, then run tests.py --update_all"
Co-authored-by: Geoff Romer <gromer@google.com>
Jon Meow
Geoff RomerandJon Meow