SI-8989 Better error message for invalid extractor pattern

1 files changed, 12 insertions, 0 deletions

diff --git a/test/files/neg/t8127a.scala b/test/files/neg/t8127a.scala
new file mode 100644
index 0000000000..c05facdac1
--- /dev/null
+++ b/test/files/neg/t8127a.scala
@@ -0,0 +1,12 @@
+object H {
+  def unapplySeq(m: Any): Seq[_] = List("")
+}
+
+object Test {
+  def unapply(m: Any) = m match {
+    case H(v) =>
+    case _ =>
+  }
+  // now:  too many patterns for object H offering Boolean: expected 0, found 1
+  // was: result type Seq[_$2] of unapplySeq defined in method unapplySeq in object H does not conform to Option[_]
+}