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Use more slice patterns inside the compiler

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This commit is contained in:
León Orell Valerian Liehr
2024-08-07 12:41:49 +02:00
parent 60d146580c
commit c4c518d2d4
40 changed files with 191 additions and 221 deletions
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8
compiler/rustc_expand/src/base.rs
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@@ -1306,12 +1306,12 @@ pub fn parse_macro_name_and_helper_attrs(
// that it's of the form `#[proc_macro_derive(Foo)]` or
// `#[proc_macro_derive(Foo, attributes(A, ..))]`
let list = attr.meta_item_list()?;
if list.len() != 1 && list.len() != 2 {
let ([trait_attr] | [trait_attr, _]) = list.as_slice() else {
dcx.emit_err(errors::AttrNoArguments { span: attr.span });
return None;
}
let Some(trait_attr) = list[0].meta_item() else {
dcx.emit_err(errors::NotAMetaItem { span: list[0].span() });
};
let Some(trait_attr) = trait_attr.meta_item() else {
dcx.emit_err(errors::NotAMetaItem { span: trait_attr.span() });
return None;
};
let trait_ident = match trait_attr.ident() {