feature error span on attribute for fn_must_use, SIMD/align reprs, macro reëxport #44111
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There were several feature-gated attributes for which the feature-not-available
error spans would point to the item annotated with the gated attribute, when it
would make more sense for the span to point to the attribute itself: if the
attribute is removed, the function/struct/&c. likely still makes sense and the
program will compile. (Note that we decline to make the analogous change for
the
main
,start
, andplugin_registrar
features, for in those cases itmakes sense for the span to implicate the entire function, of which there is
little hope of using without the gated attribute.)