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simplify and document

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This commit is contained in:
Lukas Wirth 2022-02-22 10:45:29 +01:00
parent 94e59c9c56
commit 8db88df758
6 changed files with 53 additions and 48 deletions
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13
crates/hir/src/semantics.rs
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@ -675,15 +675,24 @@ impl<'db> SemanticsImpl<'db> {
ast::MacroCall(mcall) => mcall,
// attribute we failed expansion for earlier, this might be a derive invocation
// so try downmapping the token into the pseudo derive expansion
// see [hir_expand::builtin_attr_macro] for how the pseudo derive expansion works
ast::Meta(meta) => {
let attr = meta.parent_attr()?;
let adt = attr.syntax().parent().and_then(ast::Adt::cast)?;
let call_id = self.with_ctx(|ctx| {
let (_, call_id, _) = ctx.attr_to_derive_macro_call(token.with_value(&adt), token.with_value(attr))?;
let (_, call_id, _) = ctx.attr_to_derive_macro_call(
token.with_value(&adt),
token.with_value(attr),
)?;
Some(call_id)
})?;
let file_id = call_id.as_file();
return process_expansion_for_token(&mut stack,file_id,Some(adt.into()),token.as_ref(),);
return process_expansion_for_token(
&mut stack,
file_id,
Some(adt.into()),
token.as_ref(),
);
},
_ => return None,
}