Commits on Aug 3, 2020

1. Support right hand assignment …

   This PR supports right hand assignment for Ruby 2.8.0-dev (Ruby 3.0).
   whitequark/parser#682
   
   ## `mrasgn` vs `masgn`
   
   `mrasgn` has the same structure as `masgn` except that the child nodes
   are reversed. So this PR adds `mrasgn` to the same constant as `masgn`.
   
   ### `mrasign`
   
   ```console
   % ruby-parse -e '13.divmod(5) => a, b'
   warning: parser/current is loading parser/ruby28, which recognizes
   warning: 2.8.0-dev-compliant syntax, but you are running 2.8.0.
   warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.
   (mrasgn
     (send
       (int 13) :divmod
       (int 5))
     (mlhs
       (lvasgn :a)
       (lvasgn :b)))
   ```
   
   ### `masign`
   
   ```console
   % ruby-parse -e 'a, b = 13.divmod(5)'
   warning: parser/current is loading parser/ruby28, which recognizes
   warning: 2.8.0-dev-compliant syntax, but you are running 2.8.0.
   warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.
   (masgn
     (mlhs
       (lvasgn :a)
       (lvasgn :b))
     (send
       (int 13) :divmod
       (int 5)))
   ```
   
   ## `rasgn`
   
   `rasgn` has the same structure as `mrasgn` without `mlhs`.
   So this PR adds `rasgn` to the same constant as `mrasgn`.
   
   ```console
   % ruby-parse -e '13.divmod(5) => a'
   warning: parser/current is loading parser/ruby28, which recognizes
   warning: 2.8.0-dev-compliant syntax, but you are running 2.8.0.
   warning: please see
   https://github.com/whitequark/parser#compatibility-with-ruby-mri.
   (rasgn
     (send
       (int 13) :divmod
       (int 5))
     (lvasgn :a))
   ```

   

   koic committed Aug 3, 2020
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