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Diffstat (limited to 'test/files/neg/t6895.scala')
-rw-r--r-- | test/files/neg/t6895.scala | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/test/files/neg/t6895.scala b/test/files/neg/t6895.scala new file mode 100644 index 0000000000..5fb20d8c61 --- /dev/null +++ b/test/files/neg/t6895.scala @@ -0,0 +1,26 @@ +trait Foo[F1[F1_P]] +trait Bar[F2[F2_P]] + +class Test { + def barFoo[F3[F3_P]]: Foo[F3] = ??? + + // Now we can define a couple of type aliases: + type M[X1] = String + type N[X2] = Bar[M] + + // val ok1: Foo[N] = barFoo + // Foo[?F3] <:< Foo[Test.this.N] + // [X2]Test.this.N[X2] <:< [F3_P]?F3[F3_P] + // Test.this.N[X2] <:< ?F3[X2] + // true, ?F3=N + + // val ok2: Foo[({type L[X] = Bar[M]})#L] = barFoo[N] + + val nok: Foo[({type L[X3] = Bar[M]})#L] = barFoo /* Type inference can't unify F with L */ + // Foo[?F3] <:< Foo[[X3]Bar[[X1]String]] + // [X3]Bar[[X1]String] <:< ?F3 + // [X3]Bar[[X1]String] <:< [F3_P]?F3[F3_P] + // Bar[[X1]String] <:< ?F3[X3] + // X3 <:< [X1]String + // false +} |