diff options
| -rw-r--r-- | compiler/src/dotty/tools/dotc/core/Decorators.scala | 2 | ||||
| -rw-r--r-- | tests/neg/i2151.scala | 6 |
2 files changed, 7 insertions, 1 deletions
diff --git a/compiler/src/dotty/tools/dotc/core/Decorators.scala b/compiler/src/dotty/tools/dotc/core/Decorators.scala index f8267072e..0e8ae196a 100644 --- a/compiler/src/dotty/tools/dotc/core/Decorators.scala +++ b/compiler/src/dotty/tools/dotc/core/Decorators.scala @@ -103,7 +103,7 @@ object Decorators { * as long as `xs`. */ def zipWithConserve[U](ys: List[U])(f: (T, U) => T): List[T] = - if (xs.isEmpty) xs + if (xs.isEmpty || ys.isEmpty) Nil else { val x1 = f(xs.head, ys.head) val xs1 = xs.tail.zipWithConserve(ys.tail)(f) diff --git a/tests/neg/i2151.scala b/tests/neg/i2151.scala new file mode 100644 index 000000000..1ae034c02 --- /dev/null +++ b/tests/neg/i2151.scala @@ -0,0 +1,6 @@ +trait Test { + type Nil = [K] => K + type StrangeCons[H, Tail <: [H, A] => H] = Tail[H, H] + + def list: StrangeCons[Int, Nil] // error +} |