fix test #8488

tests/misc/projects/Issue8488/compile-fail.hxml.stderr

@@ -1,4 +1,2 @@
-Main.hx:5: characters 40-41 : Unknown identifier : _
-Main.hx:5: characters 40-41 : For function argument 'v'
 Main.hx:5: characters 45-48 : String should be Int
 Main.hx:5: characters 45-48 : For optional function argument 'a'