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Document prohibition on inner attribute macros #2311

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Document prohibition on inner attribute macros #2311

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4 changes: 4 additions & 0 deletions src/procedural-macros.md
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Expand Up @@ -317,6 +317,9 @@ Attribute macros can only be used on:
- Inherent and trait [implementations]
- [Trait definitions]

r[macro.proc.attribute.inner]
Attribute macros cannot be used as an [inner attribute].

r[macro.proc.attribute.behavior]
The first [`TokenStream`] parameter is the delimited token tree following the attribute's name but not including the outer delimiters. If the applied attribute contains only the attribute name or the attribute name followed by empty delimiters, the [`TokenStream`] is empty.

Expand Down Expand Up @@ -394,6 +397,7 @@ Note that neither declarative nor procedural macros support doc comment tokens (
[function]: items/functions.md
[implementations]: items/implementations.md
[inert]: attributes.md#active-and-inert-attributes
[inner attribute]: attributes.inner
[item]: items.md
[items]: items.md
[macro namespace]: names/namespaces.md
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