Test for blank lines between leadinig dot method chains

test/ruby/test_syntax.rb

@@ -986,6 +986,27 @@ eom
     assert_valid_syntax("a #\n #\n&.foo")
     assert_valid_syntax("a\n\n.foo")
     assert_valid_syntax("a \n \n &.foo")
+
+    src = <<~RUBY
+      def m
+        # c
+
+        x
+      end
+    RUBY
+    tokens = [
+      [:on_kw,      "def",     ], # EXPR_FNAME],
+      [:on_sp,      " ",       ], # EXPR_FNAME],
+      [:on_ident,   "m",       ], # EXPR_ENDFN],
+      [:on_nl,      "\n",      ], # EXPR_BEG],
+      [:on_comment, "  # c\n", ], # EXPR_EMPTYLN],
+      [:on_sp,      "  ",      ], # EXPR_BEG],
+      [:on_ident,   "x",       ], # EXPR_CMDARG],
+      [:on_nl,      "\n",      ], # EXPR_BEG],
+      [:on_kw,      "end",     ], # EXPR_END],
+      [:on_nl,      "\n",      ], # EXPR_BEG],
+    ]
+    assert_tokens tokens, src
   end
 
   def test_no_warning_logop_literal
@@ -1404,6 +1425,17 @@ eom
     assert_equal(expected, @result, message)
   end
 
+  def assert_tokens(expected, src, message = nil)
+    begin
+      require 'ripper'
+      actual = Ripper.lex(src).map { |_position, type, value, _state| [type, value] }
+      assert_equal(expected, actual, message)
+    rescue Exception => err
+      puts err
+      exit! 1
+    end
+  end
+
   def make_tmpsrc(f, src)
     f.open
     f.truncate(0)