Merge pull request #1431 from cswinter/wip-unboundwildcard

Fix #1396, #1403: Properly handle unbound wildcard types

2 files changed, 30 insertions, 0 deletions

diff --git a/tests/pending/neg/unboundWildcard.scala b/tests/pending/neg/unboundWildcard.scala
new file mode 100644
index 000000000..eeee04fde
--- /dev/null
+++ b/tests/pending/neg/unboundWildcard.scala
@@ -0,0 +1,21 @@
+object unboundWildcard {
+
+  // TODO: move this to tests/neg once it doesn't crash the compiler anymore
+  val wildcardVal: _ = 0  // error: unbound wildcard type
+
+  val annotated: _ @unchecked = 0  // error: unbound wildcard type
+
+  def wildcardArg(x: _): Int = 0  // error: unbound wildcard type
+
+  def wildcardResult(x: Int): _ = 0  // error: unbound wildcard type
+
+  val singletonTuple: (((((((_))))))) = ???  // error: unbound wildcard type
+
+  val wildcardBoundedTypeArgL: List[_ <: _] = List(0)  // error: unbound wildcard type
+  val wildcardBoundedTypeArgU: List[_ >: _] = List(0)  // error: unbound wildcard type
+
+  def wildcardBoundedTypeParamL[T <: _](x: T): T = x  // error: unbound wildcard type
+  def wildcardBoundedTypeParamU[T >: _](x: T): T = x  // error: unbound wildcard type
+
+  val _1403: (_ <: Any) = 1  // error: unbound wildcard type
+}
diff --git a/tests/pos/wildcardInInfixType.scala b/tests/pos/wildcardInInfixType.scala
new file mode 100644
index 000000000..9905762c5
--- /dev/null
+++ b/tests/pos/wildcardInInfixType.scala
@@ -0,0 +1,9 @@
+object wildcardInInfixType {
+
+  val useless: _ => _ = (x: Int) => 1
+
+  val pointless: (_ <: Int) => _ = (x: Int) => 1
+
+  val answer: Int Either _ = Left(42)
+}
+