[GROOVY-9341] SC: Lambda within lambda that references "this" produces cast exceptions

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-rc-2
• Fix Version/s: 3.0.0-rc-3
• Assignee: Eric Milles
• Reporter: Eric Milles
• Created: 15/Dec/19 18:39
• Updated: 27/Jan/20 00:44
• Resolved: 19/Dec/19 02:58

Description

Follow up to GROOVY-9332 and GROOVY-9333. Consider the following:

@groovy.transform.CompileStatic
class ThisTest {
  private final ThisTest that = this

  void m() {
    java.util.function.Predicate<ThisTest> p1 = (ThisTest t1) -> {
      java.util.function.Predicate<ThisTest> p2 = (ThisTest t2) -> {
        assert this === t1 && this === t2
      }
      p2.test(t1)
    }
    p1.test(that)
    p1.test(this)
  }
}
new ThisTest().m()

java.lang.ClassCastException: ThisTest$_m_lambda1 cannot be cast to ThisTest
        at ThisTest$_m_lambda1$_lambda2.doCall(TestScript4.groovy:9)
        at ThisTest$_m_lambda1.doCall(TestScript4.groovy:11)
        at ThisTest.m(TestScript4.groovy:13)
        at ThisTest$m.call(Unknown Source)

Issue Links

• links to: GitHub Pull Request #1124