[ruby-cvs:78477] a1f98cd4c1 (master): vm_args.c: make the keyword deprecation message helpful

Yusuke Endoh	2019-12-03 17:56:50 +0900 (Tue, 03 Dec 2019)

  New Revision: a1f98cd4c1

  https://github.com/ruby/ruby/commit/a1f98cd4c1

  Log:
    vm_args.c: make the keyword deprecation message helpful
    
    ```
    $ ./miniruby -e 'def foo(kw: 1); end; h = {kw: 1}; foo(h)'
    -e:1: warning: The last argument is used as the keyword parameter
    -e:1: warning: for `foo' defined here; maybe ** should be added to the call?
    ```

  Modified files:
    vm_args.c