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This commit is contained in:
Ellen 2022-04-27 08:51:33 +01:00
parent de1026a67b
commit f697955c1e
8 changed files with 16 additions and 29 deletions
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4
compiler/rustc_expand/src/base.rs
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@ -1272,9 +1272,7 @@ pub fn parse_macro_name_and_helper_attrs(
// Once we've located the `#[proc_macro_derive]` attribute, verify
// that it's of the form `#[proc_macro_derive(Foo)]` or
// `#[proc_macro_derive(Foo, attributes(A, ..))]`
let Some(list) = attr.meta_item_list() else {
return None;
};
let list = attr.meta_item_list()?;
if list.len() != 1 && list.len() != 2 {
diag.span_err(attr.span, "attribute must have either one or two arguments");
return None;