syntax-highlighting/vim: Add `in` as an operator
This was missed. Ages ago.
@@ -33,7 +33,7 @@ set cpo&vim
" http://mesonbuild.com/Syntax.html
syn keyword mesonConditional elif else if endif
syn keyword mesonRepeat foreach endforeach
-syn keyword mesonOperator and not or
+syn keyword mesonOperator and not or in
syn match mesonComment "#.*$" contains=mesonTodo,@Spell
syn keyword mesonTodo FIXME NOTE NOTES TODO XXX contained
