Merge pull request #4912 from dotty-staging/fix-#2412

Fix #2412: Add regression test

Author: smarter

tests/neg/i2412.scala

@@ -0,0 +1,8 @@
+object Test {
+  def test(foo: List[String]): Unit = {
+    foo.filter(f => {
+      iDontExist // error
+      true
+    })
+  }
+}