Stabilize `#[cfg(panic = "...")]`#93658

Merged

bors merged 7 commits intorust-lang:masterfrom

cchiw:issue-77443-fix

Feb 19, 2022

Commits on Feb 10, 2022

updating the feature-gate listing and do not require the feature-gate to use the feature
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replace feature expression (cfg_panic) in lib and remove expression from tests
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Rebase
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remove reference of cfg-panic from the unstable book
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remove mention of cfg_panic from library tests
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add cfg_panic bootstrap
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added space
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