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internal: document semantics for missing names

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Aleksey Kladov 2021-03-31 13:24:08 +03:00
parent 2436621b6c
commit 5c0c09c9c3
1 changed files with 9 additions and 0 deletions
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9
crates/hir_expand/src/name.rs
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@ -55,6 +55,15 @@ impl Name {
}
}
/// A fake name for things missing in the source code.
///
/// For example, `impl Foo for {}` should be treated as a trait impl for a
/// type with a missing name. Similarly, `struct S { : u32 }` should have a
/// single field with a missing name.
///
/// Ideally, we want a `gensym` semantics for missing names -- each missing
/// name is equal only to itself. It's not clear how to implement this in
/// salsa though, so we punt on that bit for a moment.
pub fn missing() -> Name {
Name::new_text("[missing name]".into())
}