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| author | ljedrz <ljedrz@gmail.com> | 2018-10-31 16:58:51 +0100 |
|---|---|---|
| committer | ljedrz <ljedrz@gmail.com> | 2018-10-31 16:58:51 +0100 |
| commit | f4c03fd8473c2b5a254789abcb712c90b558f92d (patch) | |
| tree | cd954625a031646b799768e1f2693f590ea3f14e /src/libsyntax | |
| parent | 0db7abe5b6f3cdfca736f9238689cbea8ef61c7e (diff) | |
| download | rust-f4c03fd8473c2b5a254789abcb712c90b558f92d.tar.gz rust-f4c03fd8473c2b5a254789abcb712c90b558f92d.zip | |
syntax: improve a few allocations
Diffstat (limited to 'src/libsyntax')
| -rw-r--r-- | src/libsyntax/ext/expand.rs | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs index 33b651e1b38..37e7b44694f 100644 --- a/src/libsyntax/ext/expand.rs +++ b/src/libsyntax/ext/expand.rs @@ -387,6 +387,8 @@ impl<'a, 'b> MacroExpander<'a, 'b> { add_derived_markers(&mut self.cx, item.span(), &traits, item.clone()); let derives = derives.entry(invoc.expansion_data.mark).or_default(); + derives.reserve(traits.len()); + invocations.reserve(traits.len()); for path in &traits { let mark = Mark::fresh(self.cx.current_expansion.mark); derives.push(mark); |