Suggest adding missing braces in const block pattern

[GrigorenkoPV]

Fixes #78168.

Builds upon work done in #78173.

TODO:

• Fix a new regression in tests/ui/parser/bad-if-statements.stderr
• Fix an old regression in tests/ui/parser/keyword-const-as-identifier.rs: Suggest adding missing braces in const block pattern #78173 (review)
• Implement Suggest adding missing braces in const block pattern #78173 (comment)

@rustbot author

[rustbot]

r? @BoxyUwU

rustbot has assigned @BoxyUwU.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[bors]

☔ The latest upstream changes (presumably #133135) made this pull request unmergeable. Please resolve the merge conflicts.

[BoxyUwU]

Unasigning myself from review since this hasn't had any activity in two month, is in a draft state and has some merge conflcits. if you continue this work feel free to reassign me or roll a new reviewer

[Dylan-DPC]

@GrigorenkoPV does this still need to be a draft? or is this ready for review? if it's the latter then you can mark it as »ready for review« and the next step would be to assign a random reviewer for this. Thanks

[bors]

☔ The latest upstream changes (presumably #139897) made this pull request unmergeable. Please resolve the merge conflicts.

[rustbot]

Reminder, once the PR becomes ready for a review, use @rustbot ready.

[bors]

☔ The latest upstream changes (presumably #150469) made this pull request unmergeable. Please resolve the merge conflicts.