merge revision(s) 50671: [Backport #11192]

	* compile.c (iseq_compile_each): out of range NTH_REF is always
	  nil.

	* parse.y (parse_numvar): check overflow of NTH_REF and range.
	  [ruby-core:69393] [Bug #11192]

	* util.c (ruby_scan_digits): make public and add length parameter.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@51122 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/compile.c b/compile.c
index 099c280f75..c8ed314f1c 100644
--- a/compile.c
+++ b/compile.c
@@ -4795,6 +4795,10 @@ iseq_compile_each(rb_iseq_t *iseq, LINK_ANCHOR *ret, NODE * node, int poped)
       }
       case NODE_NTH_REF:{
         if (!poped) {
+	    if (!node->nd_nth) {
+		ADD_INSN(ret, line, putnil);
+		break;
+	    }
 	    ADD_INSN2(ret, line, getspecial, INT2FIX(1) /* '~'  */,
 		      INT2FIX(node->nd_nth << 1));
 	}