gensym

Creates unique identifiers for macros using procedural macros and UUID

Examples

```rust

macrorules! genfn { ($a:ty, $b:ty) => { gensym::gensym!{ genfn!{ $a, $b } } }; }

macrorules! _genfn { ($gensym:ident, $a:ty, $b:ty) => { fn $gensym(a: $a, b: $b) { unimplemented!() } }; }

mod test { genfn!{ u64, u64 } genfn!{ u64, u64 } } ```