Hello,

in this code:

class ClosureBug: GLib.Object {
  class TestClass {
    public int test = 42;
  }

  delegate int ReturnTestClass();

  TestClass[] tests = new TestClass[2];

  public void do_test() {
    tests[0] = new TestClass();
    tests[1] = new TestClass();

    ReturnTestClass rtc = null;
    foreach (TestClass tc in tests) {
      rtc = () => { return tc.test; };
    }

    GLib.stdout.printf("This should be 42: %d\n", rtc());
  }

  public static int main(string[] args) {
    ClosureBug cb = new ClosureBug();
    cb.do_test();
    return 0;
  }
}

Vala generates an error: 
/tmp/closure-test1.vala.PH3CBW.c: In function ‘closure_bug_do_test’:
/tmp/closure-test1.vala.PH3CBW.c:198:4: error: ‘tc’ undeclared (first use in this function)

It seems the generator prepares the closure structure correctly (from the generated code):

struct _Block1Data {
	int _ref_count_;
	ClosureBug * self;
	ClosureBugTestClass* tc;
};

But for some reason it cannot use it.