splat bug

KNOWNBUGS.rb

@@ -5,3 +5,13 @@
 # This test file includes tests which point out known bugs.
 # So all tests will cause failure.
 #
+assert_equal "[1, 2, 3, 4]", %q{
+  def foo(*b) = b
+
+  def forward(...)
+    splat = [1,2,3]
+    foo(*splat, ...)
+  end
+
+  forward(4)
+}

bootstraptest/runner.rb

@@ -428,7 +428,7 @@ def add as
   def initialize(*args)
     super
     self.class.add self
-    @category = self.path.match(/test_(.+)\.rb/)[1]
+    @category = self.path.match(/test_(.+)\.rb/)&.[](1)
   end
 
   def call