From 2af92d0ebcbeca6d3d85a27c8193273080a63090 Mon Sep 17 00:00:00 2001
From: Ichito Nagata <i.nagata110@gmail.com>
Date: Mon, 4 Jun 2018 10:52:51 +0900
Subject: Let inspect recursion do the right thing

---
 mrbgems/mruby-struct/mrblib/struct.rb | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

(limited to 'mrbgems/mruby-struct/mrblib/struct.rb')

diff --git a/mrbgems/mruby-struct/mrblib/struct.rb b/mrbgems/mruby-struct/mrblib/struct.rb
index 7cf3dd3ab..86c635df7 100644
--- a/mrbgems/mruby-struct/mrblib/struct.rb
+++ b/mrbgems/mruby-struct/mrblib/struct.rb
@@ -46,7 +46,9 @@ if Object.const_defined?(:Struct)
       ary
     end
 
-    def _inspect
+    def _inspect(recur_list)
+      return "#<struct #{self.class}:...>" if recur_list[self.object_id]
+      recur_list[self.object_id] = true
       name = self.class.to_s
       if name[0] == "#"
         str = "#<struct "
@@ -55,7 +57,7 @@ if Object.const_defined?(:Struct)
       end
       buf = []
       self.each_pair do |k,v|
-        buf.push [k.to_s + "=" + v._inspect]
+        buf.push [k.to_s + "=" + v._inspect(recur_list)]
       end
       str + buf.join(", ") + ">"
     end
@@ -70,11 +72,7 @@ if Object.const_defined?(:Struct)
     # 15.2.18.4.10(x)
     #
     def inspect
-      begin
-        self._inspect
-      rescue SystemStackError
-        "#<struct #{self.class.to_s}:...>"
-      end
+      self._inspect({})
     end
 
     ##
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