Features
* Support addressing positional members (i.e. tuple fields) using an index.
* Addresses a couple of `TODO`s relative to positional members
Changes:
* Add a new `IndexedValue` mirroring `NamedValue`
* Adds `FieldPath::index() -> int`
* Adds a `Member` variant for `IndexedValue`
This does some more work to the run_clang_tidy.py wrapper script, and runs an example pass.
"again" because it's really the proto fuzzer changes that broke it, it had been working before.
"mostly" because there's still an issue within the proto fuzzer that it can't find "port/protobuf.h", i.e. https://github.com/google/libprotobuf-mutator/tree/master/port, but I'm still hesitant to add an include path there.
Type checking now stores information on a member access identifying the member that was accessed, not only its name. This parallels what we do for other similar constructs whose meaning is resolved by name lookup or type-checking, and will allow us to avoid redoing lookups in some cases during interpretation.
Adrien Leravat
Jon Ross-Perkins
Richard Smith