T3651 isn't in this directory! It's in gadt/

testsuite/tests/ghc-regress/indexed-types/should_fail/all.T

@@ -62,5 +62,4 @@ test('T3330c', normal, compile_fail, [''])
 test('T4179', normal, compile_fail, [''])
 test('T4254', normal, compile_fail, [''])
 test('T2239', normal, compile_fail, [''])
-test('T3651', normal, compile_fail, [''])