| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/mmcloughlin/avo/build | Package build provides an assembly-like interface for incremental building of avo Files. |
| github.com/mmcloughlin/avo/operand | Package operand provides types for instruction operands. |
| github.com/mmcloughlin/avo/reg | Package reg provides types for physical and virtual registers, and definitions of x86-64 register families. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |