Merge #4775

4775: Add goto def for enum variant field r=matklad a=unexge

Closes #4764. I'm not familiar with ra codebase, there might be better ways to do that 😄 

Co-authored-by: unexge <unexge@gmail.com>

crates/ra_ide/src/syntax_highlighting.rs

@@ -436,6 +436,7 @@ fn highlight_element(
                     highlight_name(db, def) | HighlightModifier::Definition
                 }
                 Some(NameClass::ConstReference(def)) => highlight_name(db, def),
+                Some(NameClass::FieldShorthand { .. }) => HighlightTag::Field.into(),
                 None => highlight_name_by_syntax(name) | HighlightModifier::Definition,
             }
         }