Jacob Pratt
1230f74ad5
Syntactically reject tuple index shorthands in struct patterns to fix a correctness regression Split out of PR rust-lang/rust#154492. This fixes a correctness regression introduced in PR rust-lang/rust#81235 from 2021. Crater was run in my other PR and didn't report any real regressions (https://github.com/rust-lang/rust/pull/154492#issuecomment-4187544786); a rerun has been issued for a few spurious builds (https://github.com/rust-lang/rust/pull/154492#issuecomment-4237077272) but I'm certain it won't find anything either. This is a theoretical breaking change that doesn't need any T-lang input IMHO since it's such a minute, niche and crystal clear bug that's not worth bothering them with (such a decision is not unprecedented). I'm adding it to the compatibility section of the release notes as is customary. The Reference doesn't need updating since it didn't adopt this bug and thus accurately describes this part of the grammar as it used to be before 2021-02-23 and as it's meant to be. The majority of the diff is doc comment additions & necessary UI test restructurings.
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