Fix for SI-6426, importable _.

Prohibit `_` as an identifier, it can only bring badness.

2 files changed, 12 insertions, 0 deletions

diff --git a/test/files/neg/t6426.check b/test/files/neg/t6426.check
new file mode 100644
index 0000000000..149f74c4de
--- /dev/null
+++ b/test/files/neg/t6426.check
@@ -0,0 +1,7 @@
+t6426.scala:4: error: wildcard invalid as backquoted identifier
+  println(`_`.Buffer(0))
+          ^
+t6426.scala:5: error: ')' expected but '}' found.
+}
+^
+two errors found
diff --git a/test/files/neg/t6426.scala b/test/files/neg/t6426.scala
new file mode 100644
index 0000000000..a27d18eb58
--- /dev/null
+++ b/test/files/neg/t6426.scala
@@ -0,0 +1,5 @@
+class A {
+  import collection.{mutable => _, _}
+
+  println(`_`.Buffer(0))
+}