Produces invalid code for struct-literal like statement in macro

[Person-93]

I am using the seq macro from the winnow library.

The macro takes a struct literal, but instead of passing in the values for the fields, you pass in functions which it uses to initialize the fields.

If the name of the function is the same as the name of the field, rustfmt tries to shorten it to struct literal shorthand which is not valid.

fn name<'i>(input: &mut Stream<'i>) -> ModalResult<&'i str> {
    todo!()
}

fn preconditions<'i>(input: &mut Stream<'i>) -> ModalResult<Preconditions<'i>> {
    todo!()
}

// this...
seq!(PrimitiveTask {
    name: name,
    preconditions: preconditions,
});

// ...is shortened to this. It does not compile.
seq!(PrimitiveTask { name, preconditions });

// I am using this as a workaround
seq!(PrimitiveTask {
    name: { name },
    preconditions: { preconditions },
});

The seq macro is a bit complex, so I am not sure what a minimal reproduction would look like.

[ytmimi]

Thanks for the report.

Just to be clear you're setting use_field_init_shorthand=true in your projects rustfmt.toml?

[Person-93]

Just to be clear you're setting use_field_init_shorthand=true in your projects rustfmt.toml?

Yes. here is the full file:

edition = "2024"
match_block_trailing_comma = true
max_width = 80
struct_lit_width = 35
style_edition = "2024"
tab_spaces = 2
use_field_init_shorthand = true
use_try_shorthand = true

[ytmimi]

Thanks for sharing your entire rustfmt.toml. I'm pretty sure that use_field_init_shorthand=true is the only thing that's needed to reproduce the formatting error.