Remove `$/` from mruby implementation.

1. `$/` and other Perl-ish global variables are not defined in ISO.
2. The current Ruby policy do not encourage those variables.
3. Those variables has global effect and can cause troubles.

2 files changed, 3 insertions, 6 deletions

diff --git a/mrbgems/mruby-io/mrblib/io.rb b/mrbgems/mruby-io/mrblib/io.rb
index f3c4de6fd..a6e3ef3de 100644
--- a/mrbgems/mruby-io/mrblib/io.rb
+++ b/mrbgems/mruby-io/mrblib/io.rb
@@ -226,12 +226,12 @@ class IO
     end
   end
 
-  def readline(arg = $/, limit = nil)
+  def readline(arg = "\n", limit = nil)
     case arg
     when String
       rs = arg
     when Fixnum
-      rs = $/
+      rs = "\n"
       limit = arg
     else
       raise ArgumentError
@@ -242,7 +242,7 @@ class IO
     end
 
     if rs == ""
-      rs = $/ + $/
+      rs = "\n\n"
     end
 
     array = []
diff --git a/mrbgems/mruby-io/src/io.c b/mrbgems/mruby-io/src/io.c
index eb9c4097b..784cdaf49 100644
--- a/mrbgems/mruby-io/src/io.c
+++ b/mrbgems/mruby-io/src/io.c
@@ -1328,7 +1328,4 @@ mrb_init_io(mrb_state *mrb)
   mrb_define_method(mrb, io, "closed?",    mrb_io_closed,     MRB_ARGS_NONE());   /* 15.2.20.5.2 */
   mrb_define_method(mrb, io, "pid",        mrb_io_pid,        MRB_ARGS_NONE());   /* 15.2.20.5.2 */
   mrb_define_method(mrb, io, "fileno",     mrb_io_fileno,     MRB_ARGS_NONE());
-
-
-  mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$/"), mrb_str_new_cstr(mrb, "\n"));
 }