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| -rw-r--r-- | src/librustc_span/symbol.rs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/librustc_span/symbol.rs b/src/librustc_span/symbol.rs index 5203bfdb3b7..ca9702784a2 100644 --- a/src/librustc_span/symbol.rs +++ b/src/librustc_span/symbol.rs @@ -1481,6 +1481,10 @@ impl<CTX> ToStableHashKey<CTX> for Symbol { } // The `&'static str`s in this type actually point into the arena. +// +// The `FxHashMap`+`Vec` pair could be replaced by `FxIndexSet`, but #75278 +// found that to regress performance up to 2% in some cases. This might be +// revisited after further improvements to `indexmap`. #[derive(Default)] pub struct Interner { arena: DroplessArena, |