Additional test to exercise another infix error message

Author: odersky

tests/neg/leading-infix-miss.check

@@ -0,0 +1,13 @@
+-- [E008] Not Found Error: tests/neg/leading-infix-miss.scala:3:2 ------------------------------------------------------
+2 |  val x = false
+3 |  ! true   // error // error
+  |          ^
+  |          value ! is not a member of Boolean.
+  |          Note that `!` is treated as an infix operator in Scala 3.
+  |          If you do not want that, insert a `;` or empty line in front
+  |          or drop any spaces behind the operator.
+-- [E007] Type Mismatch Error: tests/neg/leading-infix-miss.scala:3:8 --------------------------------------------------
+3 |  ! true   // error // error
+  |        ^
+  |        Found:    Unit
+  |        Required: Boolean

tests/neg/leading-infix-miss.scala

@@ -0,0 +1,3 @@
+def test: Boolean =
+  val x = false
+  ! true   // error // error