Fix parsing of mutiple assignment with rescue modifier

Single assignment with rescue modifier applies rescue to the RHS:

  a = raise rescue 1 # a = (raise rescue 1)

Previously, multiple assignment with rescue modifier applied rescue
to the entire expression:

  a, b = raise rescue [1, 2] # (a, b = raise) rescue [1, 2]

This makes multiple assignment with rescue modifier consistent with
single assignment with rescue modifier, applying rescue to the RHS:

  a, b = raise rescue [1, 2] # a, b = (raise rescue [1, 2])

Implements [Feature #8239]
Fixes [Bug #8279]

1 files changed, 9 insertions, 0 deletions

diff --git a/parse.y b/parse.y
index de2a92285c..a6a9a4160b 100644
--- a/parse.y
+++ b/parse.y
@@ -1387,6 +1387,15 @@ stmt		: keyword_alias fitem {SET_LEX_STATE(EXPR_FNAME|EXPR_FITEM);} fitem
 		    /*% %*/
 		    /*% ripper: assign!($1, $3) %*/
 		    }
+                | mlhs '=' mrhs_arg modifier_rescue stmt
+                    {
+                    /*%%%*/
+                        YYLTYPE loc = code_loc_gen(&@4, &@5);
+                        value_expr($3);
+			$$ = node_assign(p, $1, NEW_RESCUE($3, NEW_RESBODY(0, remove_begin($5), 0, &loc), 0, &@$), &@$);
+                    /*% %*/
+                    /*% ripper: massign!($1, rescue_mod!($3, $5)) %*/
+                    }
 		| mlhs '=' mrhs_arg
 		    {
 		    /*%%%*/