rb_econv_open_exc  324 include/ruby/encoding.h VALUE rb_econv_open_exc(const char *senc, const char *denc, int ecflags);
rb_econv_open_exc 1183 io.c                           rb_exc_raise(rb_econv_open_exc("", "", ecflags));
rb_econv_open_exc 1212 io.c                               rb_exc_raise(rb_econv_open_exc(senc, denc, ecflags));
rb_econv_open_exc 2227 io.c                       rb_exc_raise(rb_econv_open_exc(sname, dname, ecflags));
rb_econv_open_exc 2283 transcode.c            rb_exc_raise(rb_econv_open_exc(src_encoding, dst_encoding, ecflags));
rb_econv_open_exc 2361 transcode.c            rb_exc_raise(rb_econv_open_exc(src_encoding, dst_encoding, ecflags));
rb_econv_open_exc 3154 transcode.c            rb_exc_raise(rb_econv_open_exc(sname, dname, ecflags));
rb_econv_open_exc 3157 transcode.c    	VALUE exc = rb_econv_open_exc(sname, dname, ecflags);
rb_econv_open_exc 3409 transcode.c    	VALUE exc = rb_econv_open_exc(sname, dname, ecflags);