Comment by brianolson

One feature that could achieve generics, eliminated `if err != nill{}` stutter, and allow for backwards compatibility: macros

(borrowing the '@' prefix for macros from Julia)

type ConcreteStruct @macroType(int64)

val := @errReturner(file.Write(data))

and backwards compatibility is allowed by running the go2 compiler in macro-expansion-only mode that creates macro expanded Go1 compatible source.