On Thursday, 9 June 2022 at 21:20:27 UTC, JG wrote:
In doing so I wanted to produce unique identifiers (something
like gensym in racket.) I did this in a very hacky way:
[...]
Is there some way to ask the compiler for a unique name or a
better way of achieving this?
Here's a `gensym` implementation I came up with a while back:
```d
enum gensym = q{"_gensym" ~ __traits(identifier,
{})["__lambda".length .. $]};
// Works multiple times on the same line
pragma(msg, mixin(gensym)); pragma(msg, mixin(gensym));
```
This takes advantage of the fact that the compiler generates a
unique identifier for every lambda function it encounters. While
you can't actually use those identifiers in your code, they are
visible in error messages and can be accessed via
`__traits(identifier)`.
