Rollup merge of #139908 - Zalathar:no-ascription, r=jieyouxu

parser: Remove old diagnostic notes for type ascription syntax

Type ascription syntax was removed by #109128 in 2023, so “remove this again in a few months” is long overdue.

Happily, this also reduces the amount of parser diagnostic code that cares whether the compiler is unstable.

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See also the recent #138898, which removed some other related dead code but declined to touch the diagnostics.

It's possible that some of these parser tests are no longer useful at all, but I haven't investigated them for this PR.
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Matthias Krüger 2025-04-17 00:14:27 +02:00 committed by GitHub
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