Make comma-list parsing really robust #403
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This PR adds more diagnostics for comma-delimited list of types and expressions, and ensures that commas are optional pretty much everywhere for generating a valid AST, while at the same time diagnosing all missing and extraneous commas. This ensures a match with the behavior advertised in #393.
Includes a test that exercises various corner cases.
This PR also adds
Span.RuneRangeandSpan.Rune, to aid in constructing suggestion spans.