Slava Pestov 7a16b0275b AST: Allow one-element tuple types to be constructed ...

These will never appear in the source language, but can arise
after substitution when the original type is a tuple type with
a pack expansion type.

Two examples:
- original type: (Int, T...), substitution T := {}
- original type: (T...), substitution T := {Int}

We need to model these correctly to maintain invariants.

Callers that previously used to rely on TupleType::get()
returning a ParenType now explicitly check for the one-element
case instead.

2022-08-23 11:12:00 -04:00

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