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Diffstat (limited to 'tests/untried/pos/t6221.scala')
-rw-r--r-- | tests/untried/pos/t6221.scala | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/tests/untried/pos/t6221.scala b/tests/untried/pos/t6221.scala new file mode 100644 index 000000000..bb2f1dde7 --- /dev/null +++ b/tests/untried/pos/t6221.scala @@ -0,0 +1,33 @@ +class MyFunc[-A, +B] extends (A => B) { def apply(x: A): B = ??? } + +class MyCollection[A] { + def map[B](f: MyFunc[A, B]): MyCollection[B] = new MyCollection[B] +} + +class OtherFunc[-A, +B] {} + +object Test { + implicit def functionToMyFunc[A, B](f: A => B): MyFunc[A, B] = new MyFunc // = new MyFunc[A,Nothing](); + + implicit def otherFuncToMyFunc[A, B](f: OtherFunc[A, B]): MyFunc[A, B] = new MyFunc // = new MyFunc[A,Nothing](); + + def main(args: Array[String]): Unit = { + val col = new MyCollection[Int] + + // Doesn't compile: error: missing parameter type for expanded function ((x$1) => x$1.toString) + println(col.map(_.toString)) + // scala.this.Predef.println(col.map[String](Test.this.functionToMyFunc[Int, String](((x$1: Int) => x$1.toString())))); + + // Doesn't compile: error: missing parameter type + println(col.map(x => x.toString)) + // scala.this.Predef.println(col.map[String](Test.this.functionToMyFunc[Int, String](((x: Int) => x.toString())))); + + // Does compile + println(col.map((x: Int) => x.toString)) + // scala.this.Predef.println(col.map[String](Test.this.functionToMyFunc[Int, String](((x: Int) => x.toString())))); + + // Does compile (even though type params of OtherFunc not given) + println(col.map(new OtherFunc)) + // scala.this.Predef.println(col.map[Nothing](Test.this.otherFuncToMyFunc[Any, Nothing](new OtherFunc[Any,Nothing]()))) + } +} |