Proof-of-concept Go Generics using GNU M4
Go generics are often done with ast and ssa. While parsing the AST allows for more control over generation, few would argue it's easy.
GNU M4 is a macro processor. It was made for this kind of thing.
The string escapes in the macro code are a little hard to read, and play havoc with Go syntax highlighters, but only for the .m4 code files, which will hopefully be only small libraries. Code using the generics is normal Go syntax, as are generated files.
But don't take my word for it—see for yourself. This proof-of-concept is very small.
Inspired by http://blog.00null.net/post/144763147991/using-gnu-m4-as-a-css-pre-processor