Add test for unit highlight

Emilios1995 · Emilios1995 · commit 27e6f60d25e8 · 2024-03-24T19:40:59.000-06:00
diff --git a/test/highlight/expressions.res b/test/highlight/expressions.res
@@ -72,5 +72,6 @@ let {x} = y
 let x = y.x
 //        ^variable.member 
 
-f(~a=b)
+f(~a=b, ())
 // ^property
+//      ^constant.builtin
