# File lib/rouge/lexers/rust.rb, line 26
      def self.builtins
        @builtins ||= Set.new %w(
          Add BitAnd BitOr BitXor bool c_char c_double c_float char
          c_int clock_t c_long c_longlong Cons Const Copy c_schar c_short
          c_uchar c_uint c_ulong c_ulonglong c_ushort c_void dev_t DIR
          dirent Div Either Eq Err f32 f64 Failure FILE float fpos_t
          i16 i32 i64 i8 isize Index ino_t int intptr_t Left mode_t Modulo Mul
          Neg Nil None Num off_t Ok Option Ord Owned pid_t Ptr ptrdiff_t
          Right Send Shl Shr size_t Some ssize_t str Sub Success time_t
          u16 u32 u64 u8 usize uint uintptr_t
          Box Vec String Gc Rc Arc
        )
      end