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hygiene 2.0

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This commit is contained in:
Lukas Wirth 2023-11-17 19:07:31 +01:00
parent e36b3f7b8c
commit 05f375eae2
43 changed files with 758 additions and 458 deletions
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12
crates/tt/src/lib.rs
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@ -56,6 +56,7 @@ pub trait SpanAnchor: std::fmt::Debug + Copy + Sized + Eq {
const DUMMY: Self;
}
// FIXME: Get rid of this trait?
pub trait Span: std::fmt::Debug + Copy + Sized + Eq {
const DUMMY: Self;
}
@ -72,7 +73,16 @@ pub enum TokenTree<S> {
impl_from!(Leaf<S>, Subtree<S> for TokenTree);
impl<S: Span> TokenTree<S> {
pub const fn empty() -> Self {
Self::Subtree(Subtree { delimiter: Delimiter::unspecified(), token_trees: vec![] })
Self::Subtree(Subtree { delimiter: Delimiter::UNSPECIFIED, token_trees: vec![] })
}
pub fn subtree_or_wrap(self) -> Subtree<S> {
match self {
TokenTree::Leaf(_) => {
Subtree { delimiter: Delimiter::UNSPECIFIED, token_trees: vec![self] }
}
TokenTree::Subtree(s) => s,
}
}
}