diff --git a/ChangeLog b/ChangeLog
index eea20bc4bced66..98ddd6b2d78dbd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+Wed Feb 15 10:25:22 2012  Naohisa Goto  <ngotogenome@gmail.com>
+
+	* vm_eval.c (check_funcall): set array elements one-by-one to fix
+	  compile error with Fujitsu C Compiler 5.6 on Solaris 10 on Sparc.
+
+Wed Feb 15 10:25:22 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* test/ruby/test_object.rb: tests that respond_to? returns false.
+
+Wed Feb 15 10:25:22 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* vm_eval.c (check_funcall): try respond_to? first if redefined.
+	  [Bug #5158]
+
 Wed Feb 15 07:15:50 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* compile.c (defined_expr): guard the whole expression.
diff --git a/test/ruby/test_object.rb b/test/ruby/test_object.rb
index db34d144792a6e..d33b9f63412d23 100644
--- a/test/ruby/test_object.rb
+++ b/test/ruby/test_object.rb
@@ -181,18 +181,30 @@ def test_convert_type
     o = Object.new
     def o.to_s; 1; end
     assert_raise(TypeError) { String(o) }
+    def o.to_s; "o"; end
+    assert_equal("o", String(o))
+    def o.respond_to?(*) false; end
+    assert_raise(TypeError) { String(o) }
   end
 
   def test_check_convert_type
     o = Object.new
     def o.to_a; 1; end
     assert_raise(TypeError) { Array(o) }
+    def o.to_a; [1]; end
+    assert_equal([1], Array(o))
+    def o.respond_to?(*) false; end
+    assert_equal([o], Array(o))
   end
 
   def test_to_integer
     o = Object.new
     def o.to_i; nil; end
     assert_raise(TypeError) { Integer(o) }
+    def o.to_i; 42; end
+    assert_equal(42, Integer(o))
+    def o.respond_to?(*) false; end
+    assert_raise(TypeError) { Integer(o) }
   end
 
   class MyInteger
@@ -383,6 +395,31 @@ def method_missing(id,*args)
     end
   end
 
+  def test_implicit_respond_to
+    bug5158 = '[ruby-core:38799]'
+
+    p = Object.new
+
+    called = []
+    p.singleton_class.class_eval do
+      define_method(:to_ary) do
+        called << [:to_ary, bug5158]
+      end
+    end
+    [[p]].flatten
+    assert_equal([[:to_ary, bug5158]], called, bug5158)
+
+    called = []
+    p.singleton_class.class_eval do
+      define_method(:respond_to?) do |*a|
+        called << [:respond_to?, *a]
+        false
+      end
+    end
+    [[p]].flatten
+    assert_equal([[:respond_to?, :to_ary, true]], called, bug5158)
+  end
+
   def test_method_missing_passed_block
     bug5731 = '[ruby-dev:44961]'
 
diff --git a/test/ruby/test_proc.rb b/test/ruby/test_proc.rb
index efd5a269fdb552..3cac94a1008912 100644
--- a/test/ruby/test_proc.rb
+++ b/test/ruby/test_proc.rb
@@ -787,7 +787,7 @@ def test_attr_source_location
   end
 
   def test_splat_without_respond_to
-    def (obj = Object.new).respond_to?(m); false end
+    def (obj = Object.new).respond_to?(m,*); false end
     [obj].each do |a, b|
       assert_equal([obj, nil], [a, b], '[ruby-core:24139]')
     end
diff --git a/version.h b/version.h
index 9066c06cd64d4d..619c81b690db3b 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.3"
-#define RUBY_PATCHLEVEL 117
+#define RUBY_PATCHLEVEL 118
 
 #define RUBY_RELEASE_DATE "2012-02-15"
 #define RUBY_RELEASE_YEAR 2012
diff --git a/vm_eval.c b/vm_eval.c
index a7e15918b57444..cfa75a46b30acc 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -204,7 +204,7 @@ stack_check(void)
 }
 
 static inline rb_method_entry_t *rb_search_method_entry(VALUE recv, ID mid);
-static inline int rb_method_call_status(rb_thread_t *th, rb_method_entry_t *me, call_type scope, VALUE self);
+static inline int rb_method_call_status(rb_thread_t *th, const rb_method_entry_t *me, call_type scope, VALUE self);
 #define NOEX_OK NOEX_NOSUPER
 
 /*!
@@ -266,12 +266,26 @@ check_funcall_failed(struct rescue_funcall_args *args, VALUE e)
 static VALUE
 check_funcall(VALUE recv, ID mid, int argc, VALUE *argv)
 {
-    rb_method_entry_t *me = rb_search_method_entry(recv, mid);
+    VALUE klass = CLASS_OF(recv);
+    const rb_method_entry_t *me;
     rb_thread_t *th = GET_THREAD();
-    int call_status = rb_method_call_status(th, me, CALL_FCALL, Qundef);
+    int call_status;
+
+    me = rb_method_entry(klass, idRespond_to);
+    if (me && !(me->flag & NOEX_BASIC)) {
+	VALUE args[2];
+
+	args[0] = ID2SYM(mid);
+	args[1] = Qtrue;
+	if (!RTEST(vm_call0(th, recv, idRespond_to, 2, args, me))) {
+	    return Qundef;
+	}
+    }
 
+    me = rb_search_method_entry(recv, mid);
+    call_status = rb_method_call_status(th, me, CALL_FCALL, Qundef);
     if (call_status != NOEX_OK) {
-	if (rb_method_basic_definition_p(CLASS_OF(recv), idMethodMissing)) {
+	if (rb_method_basic_definition_p(klass, idMethodMissing)) {
 	    return Qundef;
 	}
 	else {
@@ -376,7 +390,7 @@ rb_search_method_entry(VALUE recv, ID mid)
 }
 
 static inline int
-rb_method_call_status(rb_thread_t *th, rb_method_entry_t *me, call_type scope, VALUE self)
+rb_method_call_status(rb_thread_t *th, const rb_method_entry_t *me, call_type scope, VALUE self)
 {
     VALUE klass;
     ID oid;