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Add some explanatory comments.

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This commit is contained in:
Nicholas Nethercote 2019-10-22 11:09:42 +11:00
parent 2f7d7c2ca4
commit e6d541a60a
1 changed files with 7 additions and 0 deletions
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7
src/libsyntax_pos/symbol.rs
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@ -1109,6 +1109,8 @@ where
}
}
// This impl allows a `SymbolStr` to be directly equated with a `String` or
// `&str`.
impl<T: std::ops::Deref<Target = str>> std::cmp::PartialEq<T> for SymbolStr {
fn eq(&self, other: &T) -> bool {
self.string == other.deref()
@ -1118,6 +1120,11 @@ impl<T: std::ops::Deref<Target = str>> std::cmp::PartialEq<T> for SymbolStr {
impl !Send for SymbolStr {}
impl !Sync for SymbolStr {}
/// This impl means that if `ss` is a `SymbolStr`:
/// - `*ss` is a `str`;
/// - `&*ss` is a `&str`;
/// - `&ss as &str` is a `&str`, which means that `&ss` can be passed to a
/// function expecting a `&str`.
impl std::ops::Deref for SymbolStr {
type Target = str;
#[inline]