[ruby/error_highlight] Fix error with prism when method given no arguments

such as:

  p = Proc.new

This now matches the RubyVM::AbstractSyntaxTree behavior, which is
not to highlight anything.

https://github.com/ruby/error_highlight/commit/d5c592a1ba

1 files changed, 9 insertions, 0 deletions

diff --git a/test/error_highlight/test_error_highlight.rb b/test/error_highlight/test_error_highlight.rb
index 5f4c386990..63e7032eda 100644
--- a/test/error_highlight/test_error_highlight.rb
+++ b/test/error_highlight/test_error_highlight.rb
@@ -197,6 +197,15 @@ undefined method `foo' for #{ NIL_RECV_MESSAGE }
     end
   end
 
+  def test_CALL_arg_7
+    assert_error_message(ArgumentError, <<~END) do
+tried to create Proc object without a block (ArgumentError)
+    END
+
+      Proc.new
+    end
+  end
+
   def test_QCALL_1
     assert_error_message(NoMethodError, <<~END) do
 undefined method `foo' for #{ ONE_RECV_MESSAGE }