From f4c03fd8473c2b5a254789abcb712c90b558f92d Mon Sep 17 00:00:00 2001 From: ljedrz Date: Wed, 31 Oct 2018 16:58:51 +0100 Subject: syntax: improve a few allocations --- src/libsyntax_ext/deriving/generic/mod.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/libsyntax_ext') diff --git a/src/libsyntax_ext/deriving/generic/mod.rs b/src/libsyntax_ext/deriving/generic/mod.rs index 002ecce58e6..dd90ef06c39 100644 --- a/src/libsyntax_ext/deriving/generic/mod.rs +++ b/src/libsyntax_ext/deriving/generic/mod.rs @@ -1384,7 +1384,7 @@ impl<'a> MethodDef<'a> { // let __self2_vi = unsafe { // std::intrinsics::discriminant_value(&arg2) } as i32; // ``` - let mut index_let_stmts: Vec = Vec::new(); + let mut index_let_stmts: Vec = Vec::with_capacity(vi_idents.len() + 1); // We also build an expression which checks whether all discriminants are equal // discriminant_test = __self0_vi == __self1_vi && __self0_vi == __self2_vi && ... -- cgit 1.4.1-3-g733a5