Implement `@deprecated`#22898

Merged

andrewrk merged 12 commits intoziglang:masterfrom

kristoff-it:deprecated-proposal

Feb 27, 2025

Commits on Feb 26, 2025

initial implementation of `@deprecated`

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`@deprecated`: add build system support

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andrewrk
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`@deprecated`: add langref entry

kristoff-it
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`@deprecated`: add tests

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`@deprecated`: optimize sema implementation

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andrewrk
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`@deprecated`: add suggested changes to langref entry

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`@deprecated`: remove per-module flag in Build

kristoff-it
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andrewrk
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langref: fix whitespace
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langref: update deprecated section
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don't inherit allowed deprecation from parent modules
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reword deprecated error slightly
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fix regressed build system unit test

kristoff-it
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andrewrk
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