MOmoefh·May 10, 2026
Pretty nifty. As of now, the code doesn't compile: there's some stray "span" stuff in codegen.rs[1], and it's trying to format `Warning` which doesn't implement `Display` in main.rs[2].
Fixing these, it runs mostly as advertised, but it seems to assume that one-letter types are always generic parameters, so it's impossible to (for example) generate this:
struct X;
enum A {
P(X),
Q
}
Trying this:
(struct X)
(enum A (P X) Q)
produces this:
struct X;
enum A<P, X> { Q }
while using a multi-letter type like `String`:
(enum A (P String) Q)
produces the expected:
enum A { P(String), Q }
One way to solve this would be to always require the generic annotation, and let it be empty when there are no generics, but when I tried that it did something weird:
(struct X)
(enum A () (P X) Q)
Read the rest
produces:
struct X;
enum A {
_ /* List([], Some(Span { start: 54, end: 56 })) */,
P(X),
Q
}
I have no idea where the `_` and the comment came from.
[1] https://github.com/ThatXliner/rust-but-lisp/blob/70c51a107b2...
[2] https://github.com/ThatXliner/rust-but-lisp/blob/70c51a107b2...