From e2ac7b3d8b58816813ad1d05ed86fec8c80973d6 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 22 Oct 2015 06:30:12 +0000
Subject: Safe navigation operator

* compile.c (iseq_peephole_optimize): peephole optimization for
  branchnil jumps.
* compile.c (iseq_compile_each): generate save navigation operator
  code.
* insns.def (branchnil): new opcode to pop the tos and branch if
  it is nil.
* parse.y (NEW_QCALL, call_op, parser_yylex): parse token '.?'.
  [Feature #11537]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52214 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 node.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'node.c')

diff --git a/node.c b/node.c
index db9aa775f3..320e5d3bd4 100644
--- a/node.c
+++ b/node.c
@@ -357,7 +357,10 @@ dump_node(VALUE buf, VALUE indent, int comment, NODE *node)
 	ANN("          where [attr]: [nd_next->nd_vid]");
 	ANN("example: struct.field += foo");
 	F_NODE(nd_recv, "receiver");
-	F_ID(nd_next->nd_vid, "attr");
+	F_CUSTOM1(nd_next->nd_vid, "attr") {
+	    if (node->nd_next->nd_aid) A("? ");
+	    A_ID(node->nd_next->nd_vid);
+	}
 	F_CUSTOM1(nd_next->nd_mid, "operator") {
 	    switch (node->nd_next->nd_mid) {
 	      case 0: A("0 (||)"); break;
-- 
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