Merge #2837

2837: Accidentally quadratic r=matklad a=matklad

Our syntax highlighting is accdentally quadratic. Current state of the PR fixes it in a pretty crude way, looks like for the proper fix we need to redo how source-analyzer works. 

**NB:** don't be scared by diff stats, that's mostly a test-data file

Co-authored-by: Aleksey Kladov <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/ra_hir_def/src/lib.rs b/crates/ra_hir_def/src/lib.rs
index ebc12e891..feb3a300d 100644
--- a/crates/ra_hir_def/src/lib.rs
+++ b/crates/ra_hir_def/src/lib.rs
@@ -332,7 +332,7 @@ pub enum VariantId {
     StructId(StructId),
     UnionId(UnionId),
 }
-impl_froms!(VariantId: EnumVariantId, StructId);
+impl_froms!(VariantId: EnumVariantId, StructId, UnionId);
 
 trait Intern {
     type ID;