Allow MemberExpression in RestElement argument

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: asgerf

javascript/extractor/src/com/semmle/jcorn/Parser.java

@@ -2359,7 +2359,8 @@ protected List<Expression> toAssignableList(List<Expression> exprList, boolean i
       } else if (last != null && last instanceof SpreadElement) {
         Expression arg = ((SpreadElement) last).getArgument();
         arg = (Expression) this.toAssignable(arg, isBinding);
-        if (!(arg instanceof IPattern)) this.unexpected(arg.getLoc().getStart());
+        if (!(arg instanceof IPattern || arg instanceof MemberExpression))
+          this.unexpected(arg.getLoc().getStart());
         exprList.set(end - 1, last = new RestElement(last.getLoc(), arg));
         --end;
       }