SI-8182 Avert crash due to type args in pattern

Error out type args on binary op after emitting error.
Let the parse limp into the whirring blades.

2 files changed, 40 insertions, 0 deletions

diff --git a/test/files/neg/t8182.check b/test/files/neg/t8182.check
new file mode 100644
index 0000000000..a156d70883
--- /dev/null
+++ b/test/files/neg/t8182.check
@@ -0,0 +1,22 @@
+t8182.scala:4: error: illegal start of simple pattern
+}
+^
+t8182.scala:7: error: illegal start of simple pattern
+}
+^
+t8182.scala:6: error: type application is not allowed in pattern
+  val a b[B]  // error then continue as for X
+        ^
+t8182.scala:10: error: illegal start of simple pattern
+    case a b[B] => // bumpy recovery
+                ^
+t8182.scala:10: error: type application is not allowed in pattern
+    case a b[B] => // bumpy recovery
+           ^
+t8182.scala:11: error: '=>' expected but '}' found.
+  }
+  ^
+t8182.scala:16: error: type application is not allowed in pattern
+    case a B[T] b =>
+           ^
+7 errors found
diff --git a/test/files/neg/t8182.scala b/test/files/neg/t8182.scala
new file mode 100644
index 0000000000..1b3bc9821f
--- /dev/null
+++ b/test/files/neg/t8182.scala
@@ -0,0 +1,18 @@
+
+trait X {
+  val a b     // something missing
+}
+trait Y {
+  val a b[B]  // error then continue as for X
+}
+trait Z {
+  (null: Any) match {
+    case a b[B] => // bumpy recovery
+  }
+}
+object B { def unapply[W](a: Any) = Some((1,2)) }
+trait Z {
+  (null: Any) match {
+    case a B[T] b =>
+  }
+}