diff options
Diffstat (limited to 'test/pending/pos/t2173.scala')
-rw-r--r-- | test/pending/pos/t2173.scala | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/test/pending/pos/t2173.scala b/test/pending/pos/t2173.scala new file mode 100644 index 0000000000..9a9a2edce4 --- /dev/null +++ b/test/pending/pos/t2173.scala @@ -0,0 +1,17 @@ + + +This (somewhat convoluted) code fails to compile + +class A[+U>:Null] { + + type R[+X>:Null] = X type O[+X] = A[R[X]] + +} + +with the following error: + +type arguments [A.this.R[X]] do not conform to class A's type parameter bounds [+U >: Null] + +However, because type R[+X>:Null] is identical to X, it should carry X bounds and R[X] lower bound should be known to be X's lower bound, i.e. Null. + +The same problem occurs with upper bounds. |