Let inspect recursion do the right thing

2 files changed, 9 insertions, 10 deletions

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
 
     ##
diff --git a/mrbgems/mruby-struct/test/struct.rb b/mrbgems/mruby-struct/test/struct.rb
index 982e344e2..2b5751086 100644
--- a/mrbgems/mruby-struct/test/struct.rb
+++ b/mrbgems/mruby-struct/test/struct.rb
@@ -116,9 +116,10 @@ assert('struct dup') do
 end
 
 assert('struct inspect') do
-  c = Struct.new(:m1, :m2, :m3, :m4, :m5)
-  cc = c.new(1,2,3,4,5)
-  assert_equal "#<struct m1=1, m2=2, m3=3, m4=4, m5=5>", cc.inspect
+  c = Struct.new(:m1, :m2, :m3, :m4, :m5, :recur)
+  cc = c.new(1,2,3,4,5,nil)
+  cc.recur = cc
+  assert_equal "#<struct m1=1, m2=2, m3=3, m4=4, m5=5, recur=#<struct #{cc.class}:...>>", cc.inspect
 end
 
 assert('Struct#length, Struct#size') do