Add regression test for #19087

Author: mbovel

tests/pos/19087.scala

@@ -0,0 +1,15 @@
+case class State(x: Int)
+
+def foo[T](state: State)(body: => T): Option[T]
+  Option.when(state.x == 0) body
+
+var bar = 0
+val state = State(0)
+
+def app: Function1[Int, Unit] =
+  new Function1[Int, Unit]:
+    def apply(x: Int): Unit =
+      foo(state):
+        foo(state.copy(x = 5): // Missing ")"
+          println("a")
+      bar = 2