Re: [PATCH v2] rust: macros: vtable: fix `HAS_*` redefinition (`gen_const_name`)

[Alice Ryhl]

On 8/3/23 16:09, Qingsong Chen wrote:
> If we define the same function name twice in a trait (using `#[cfg]`),
> the `vtable` macro will redefine its `gen_const_name`, e.g. this will
> define `HAS_BAR` twice:
>
> ```rust
>      #[vtable]
>      pub trait Foo {
>          #[cfg(CONFIG_X)]
>          fn bar();
>
>          #[cfg(not(CONFIG_X))]
>          fn bar(x: usize);
>      }
> ```
>
> Changelog:
> ----------
> v1 -> v2:
> - Use `BTreeSet` and existing `consts` as suggested by Alice and Gary.
> - Reword commit messages as suggested by Miguel.
> ====================
>
> Fixes: b44becc5ee80 ("rust: macros: add `#[vtable]` proc macro")
> Signed-off-by: Qingsong Chen <changxian.cqs@xxxxxxxxxxxx>

Reviewed-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>