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Special case underscore in mbe meta op

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This commit is contained in:
Edwin Cheng 2020-12-28 18:51:43 +08:00
parent b33453f844
commit b5c29af02a
2 changed files with 45 additions and 2 deletions
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11
crates/mbe/src/parser.rs
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@ -101,8 +101,15 @@ fn next_op<'a>(
Op::Repeat { subtree, separator, kind }
}
tt::TokenTree::Leaf(leaf) => match leaf {
tt::Leaf::Punct(_) => {
return Err(ExpandError::UnexpectedToken);
tt::Leaf::Punct(punct) => {
static UNDERSCORE: SmolStr = SmolStr::new_inline("_");
if punct.char != '_' {
return Err(ExpandError::UnexpectedToken);
}
let name = &UNDERSCORE;
let kind = eat_fragment_kind(src, mode)?;
Op::Var { name, kind }
}
tt::Leaf::Ident(ident) => {
let name = &ident.text;