From https://go.dev/doc/asm https://go.dev/doc/asm: > The assembler is based on the input style of the Plan 9 assemblers, which is documented in detail elsewhe

From https://go.dev/doc/asm https://go.dev/doc/asm: > The assembler is based on the input style of the Plan 9 assemblers, which is documented in detail elsewhere. If you plan to write assembly language, you should read that document although much of it is Plan 9-specific. That first sentence links to https://9p.io/sys/doc/asm.html https://9p.io/sys/doc/asm.html. So yes, definitely not a coincidence.