segeljakt/derive_less

Macro for templating item declarations.

derive_less's Issues

Private structs

This appears to behave as expected:

derive_less! {
    #[derive(Debug)] pub struct ... { pub ... }

    struct S {
        f: u8,
    }
}

But this fails to expand:

derive_less! {
    #[derive(Debug)] struct ... { pub ... }

    struct S {
        f: u8,
    }
}

error: local ambiguity: multiple parsing options: built-in NTs ident ('svis') or 1 other option.
 --> src/main.rs:4:22
  |
4 |     #[derive(Debug)] struct ... { pub ... }
  |                      ^^^^^^

Trait bounds

This appears to behave as expected:

derive_less! {
    #[derive(Debug)] pub struct ... { pub ... }

    struct S<T> {
        f: T,
    }
}

But this fails with "error: no rules expected the token `)`":

trait Trait {}

derive_less! {
    #[derive(Debug)] pub struct ... { pub ... }

    struct S<T: Trait> {
        f: T,
    }
}

Restricted visibility

This appears to behave as expected:

derive_less! {
    #[derive(Debug)] pub struct ... { pub ... }

    struct S {
        f: u8,
    }
}

But this fails to expand:

derive_less! {
    #[derive(Debug)] pub struct ... { pub(crate) ... }

    struct S {
        f: u8,
    }
}

error: no rules expected the token `(`
 --> src/main.rs:4:42
  |
4 |     #[derive(Debug)] pub struct ... { pub(crate) ... }
  |                                          ^ no rules expected this token in macro call

Multiple attrs on field

This appears to behave as expected:

derive_less! {
    #[derive(Debug)] pub struct ... { #[doc = ""] pub ... }

    struct S {
        f: u8,
    }
}

But this fails to expand:

derive_less! {
    #[derive(Debug)] pub struct ... { #[doc = ""] #[doc = ""] pub ... }

    struct S {
        f: u8,
    }
}

error: no rules expected the token `#`
 --> src/main.rs:4:51
  |
4 |     #[derive(Debug)] pub struct ... { #[doc = ""] #[doc = ""] pub ... }
  |                                                   ^ no rules expected this token in macro call

(Filing this to track the limitation listed in the readme. Maybe a proc macro rewrite would solve this.)

Where-clauses

This appears to behave as expected:

derive_less! {
    #[derive(Debug)] pub struct ... { pub ... }

    struct S<T> {
        f: T,
    }
}

But this fails with "error: no rules expected the token `)`":

trait Trait {}

derive_less! {
    #[derive(Debug)] pub struct ... { pub ... }

    struct S<T>
    where
        T: Trait,
    {
        f: T,
    }
}

Can't have struct with private fields

This appears to behave as expected:

derive_less! {
    #[derive(Debug)] pub struct ... { pub ... }

    struct S {
        f: u8,
    }
}

But this fails with "error: no rules expected the token `)`":

derive_less! {
    #[derive(Debug)] pub struct ... { ... }

    struct S {
        f: u8,
    }
}