Use Rc<[Symbol]> instead of Vec<Symbol> to reduce # of allocs

2019-02-07 14:19:06 +01:00
parent 1dba7cb202
commit b681433b9d
19 changed files with 54 additions and 50 deletions
--- a/src/libsyntax/std_inject.rs
+++ b/src/libsyntax/std_inject.rs
@@ -20,9 +20,9 @@ fn ignored_span(sp: Span) -> Span {
        call_site: DUMMY_SP,
        def_site: None,
        format: MacroAttribute(Symbol::intern("std_inject")),
-        allow_internal_unstable: vec![
+        allow_internal_unstable: Some(vec![
            Symbol::intern("prelude_import"),
-        ],
+        ].into()),
        allow_internal_unsafe: false,
        local_inner_macros: false,
        edition: hygiene::default_edition(),