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Remove token::Lit from ast::MetaItemLit.

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`token::Lit` contains a `kind` field that indicates what kind of literal
it is. `ast::MetaItemLit` currently wraps a `token::Lit` but also has
its own `kind` field. This means that `ast::MetaItemLit` encodes the
literal kind in two different ways.

This commit changes `ast::MetaItemLit` so it no longer wraps
`token::Lit`. It now contains the `symbol` and `suffix` fields from
`token::Lit`, but not the `kind` field, eliminating the redundancy.
This commit is contained in:
Nicholas Nethercote 2022-11-29 13:36:00 +11:00
parent a7f35c42d4
commit 2fd364acff
9 changed files with 56 additions and 23 deletions
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10
compiler/rustc_builtin_macros/src/derive.rs
View file

@ -1,7 +1,7 @@
use crate::cfg_eval::cfg_eval;
use rustc_ast as ast;
use rustc_ast::{token, GenericParamKind, ItemKind, MetaItemKind, NestedMetaItem, StmtKind};
use rustc_ast::{GenericParamKind, ItemKind, MetaItemKind, NestedMetaItem, StmtKind};
use rustc_errors::{struct_span_err, Applicability};
use rustc_expand::base::{Annotatable, ExpandResult, ExtCtxt, Indeterminate, MultiItemModifier};
use rustc_feature::AttributeTemplate;
@ -130,9 +130,11 @@ fn report_bad_target(sess: &Session, item: &Annotatable, span: Span) -> bool {
}
fn report_unexpected_meta_item_lit(sess: &Session, lit: &ast::MetaItemLit) {
let help_msg = match lit.token_lit.kind {
token::Str if rustc_lexer::is_ident(lit.token_lit.symbol.as_str()) => {
format!("try using `#[derive({})]`", lit.token_lit.symbol)
let help_msg = match lit.kind {
ast::LitKind::Str(_, ast::StrStyle::Cooked)
if rustc_lexer::is_ident(lit.symbol.as_str()) =>
{
format!("try using `#[derive({})]`", lit.symbol)
}
_ => "for example, write `#[derive(Debug)]` for `Debug`".to_string(),
};