`*` in an array pattern should not be parsed as nil in ripper

After 6c0925ba7017efde6091e2ec4f1a6be268166696, it was impossible
to distinguish between the presence or absence of `*`.

    # Before the commit
    Ripper.sexp('0 in []')[1][0][2][1]  #=> [:aryptn, nil, nil, nil, nil]
    Ripper.sexp('0 in [*]')[1][0][2][1] #=> [:aryptn, nil, nil, [:var_field, nil], nil]

    # After the commit
    Ripper.sexp('0 in []')[1][0][2][1]  #=> [:aryptn, nil, nil, nil, nil]
    Ripper.sexp('0 in [*]')[1][0][2][1] #=> [:aryptn, nil, nil, nil, nil]

This commit reverts it.

1 files changed, 1 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index 4ff8644c47..f371185ee0 100644
--- a/parse.y
+++ b/parse.y
@@ -4656,7 +4656,7 @@ p_rest		: tSTAR tIDENTIFIER
                     /*%%%*/
                         $$ = 0;
                     /*% %*/
-                    /*% ripper: Qnil %*/
+                    /*% ripper: var_field(p, Qnil) %*/
                     }
                 ;