class.c (mrb_method_missing): add receiver's class to clarify

We needed to modify a lot of test code that expected the old style.

mrbgems/mruby-bin-mirb/bintest/mirb.rb

@@ -54,5 +54,5 @@ a = 5
 A.call
   TESTCODE
 
-  assert_kind_of Integer, o =~ /\bundefined method 'a' \(NoMethodError\).*=> 5\b.*=> 1\b/m
+  assert_kind_of Integer, o =~ /\bundefined method 'a' .*\(NoMethodError\).*=> 5\b.*=> 1\b/m
 end

mrbgems/mruby-bin-mruby/bintest/mruby.rb

@@ -166,8 +166,8 @@ assert('top level local variables are in file scope') do
   system "#{cmd('mrbc')} -g -o #{amrb.path} #{arb.path}"
   File.write brb.path, 'p a'
   system "#{cmd('mrbc')} -g -o #{bmrb.path} #{brb.path}"
-  assert_mruby("", /:1: undefined method 'a' \(NoMethodError\)\n\z/, false, ["-r", arb.path, brb.path])
-  assert_mruby("", /:1: undefined method 'a' \(NoMethodError\)\n\z/, false, ["-b", "-r", amrb.path, bmrb.path])
+  assert_mruby("", /:1: undefined method 'a' .*\(NoMethodError\)\n\z/, false, ["-r", arb.path, brb.path])
+  assert_mruby("", /:1: undefined method 'a' .*\(NoMethodError\)\n\z/, false, ["-b", "-r", amrb.path, bmrb.path])
 
   File.write crb.path, 'a, b, c = 1, 2, 3; A = -> { b = -2; [a, b, c] }'
   system "#{cmd('mrbc')} -g -o #{cmrb.path} #{crb.path}"

src/class.c

@@ -2844,7 +2844,7 @@ mrb_value mrb_obj_id_m(mrb_state *mrb, mrb_value self);
 mrb_noreturn void
 mrb_method_missing(mrb_state *mrb, mrb_sym name, mrb_value self, mrb_value args)
 {
-  mrb_no_method_error(mrb, name, args, "undefined method '%n'", name);
+  mrb_no_method_error(mrb, name, args, "undefined method '%n' for %T", name, self);
 }
 
 /* 15.3.1.3.30 */

test/t/kernel.rb

@@ -352,7 +352,7 @@ assert('Kernel#method_missing', '15.3.1.3.30') do
   end
 
   a = String.new
-  msg = "undefined method 'no_method_named_this'"
+  msg = "undefined method 'no_method_named_this' for String"
   assert_raise_with_message(NoMethodError, msg) do
     a.no_method_named_this
   end