fix docs for compiler builtin macros #30080
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I think it may be better to correct this to |
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@alexcrichton done, also added a link to the reference for that syntax. |
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Fixes #30073. The input to `cfg!` is a meta attribute, but not _any_ meta attribute (e.g. `cfg!(allow(dead_code))` doesn't compile). But the macro_rules syntax can't quite express this, so I added a note to the doc.
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Fixes #30073. The input to
cfg!is a meta attribute, but not any meta attribute (e.g.cfg!(allow(dead_code))doesn't compile). But the macro_rules syntax can't quite express this, so I added a note to the doc.