diff options
| -rw-r--r-- | src/libsyntax_pos/symbol.rs | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/src/libsyntax_pos/symbol.rs b/src/libsyntax_pos/symbol.rs index d0ba09af30b..c0c9c2a1000 100644 --- a/src/libsyntax_pos/symbol.rs +++ b/src/libsyntax_pos/symbol.rs @@ -463,15 +463,16 @@ pub struct Interner { impl Interner { fn prefill(init: &[&str]) -> Self { let mut this = Interner::default(); - for &string in init { - if string == "" { - // We can't allocate empty strings in the arena, so handle this here. - let name = Symbol::new(this.strings.len() as u32); - this.names.insert("", name); - this.strings.push(""); - } else { - this.intern(string); - } + this.names.reserve(init.len()); + this.strings.reserve(init.len()); + + // We can't allocate empty strings in the arena, so handle this here. + assert!(keywords::Invalid.name().as_u32() == 0 && init[0].is_empty()); + this.names.insert("", keywords::Invalid.name()); + this.strings.push(""); + + for string in &init[1..] { + this.intern(string); } this } |