Warn on inert attributes used on bang macro invocation #87296
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These attributes are currently discarded. This may change in the future (see rust-lang#63221), but for now, placing inert attributes on a macro invocation does nothing, so we should warn users about it. Technically, it's possible for there to be attribute macro on the same macro invocation (or at a higher scope), which inspects the inert attribute. For example: ```rust #[look_for_inline_attr] #[inline] my_macro!() #[look_for_nested_inline] mod foo { #[inline] my_macro!() } ``` However, this would be a very strange thing to do. Anyone running into this can manually suppress the warning.
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| let attr_name = attr.ident().unwrap().name; | ||
| // `#[cfg]` and `#[cfg_attr]` are special - they are | ||
| // eagerly evaluated. | ||
| if attr_name != sym::cfg && attr_name != sym::cfg_attr { |
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cfg and cfg_attr should be unreachable here in theory, but that's not entirely true right now because cfg(TRUE) doesn't remove itself.
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Warn on inert attributes used on bang macro invocation These attributes are currently discarded. This may change in the future (see rust-lang#63221), but for now, placing inert attributes on a macro invocation does nothing, so we should warn users about it. Technically, it's possible for there to be attribute macro on the same macro invocation (or at a higher scope), which inspects the inert attribute. For example: ```rust #[look_for_inline_attr] #[inline] my_macro!() #[look_for_nested_inline] mod foo { #[inline] my_macro!() } ``` However, this would be a very strange thing to do. Anyone running into this can manually suppress the warning.
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These attributes are currently discarded.
This may change in the future (see #63221), but for now,
placing inert attributes on a macro invocation does nothing,
so we should warn users about it.
Technically, it's possible for there to be attribute macro
on the same macro invocation (or at a higher scope), which
inspects the inert attribute. For example:
However, this would be a very strange thing to do.
Anyone running into this can manually suppress the warning.