rb_enc_path_last_separator 3050 file.c         #define strrdirsep rb_enc_path_last_separator
rb_enc_path_last_separator  279 include/ruby/encoding.h char *rb_enc_path_last_separator(const char *,const char *,rb_encoding*);
rb_enc_path_last_separator  558 ruby.c         	    p = rb_enc_path_last_separator(libpath, p, rb_ascii8bit_encoding());