Wrong `unexpected token` diagnostic when passing negative numbers to `concat!`

[vdrn]

This code compiles fine with rustc, but rust analyzer reports error: unexpected token

 pub const T: &str = concat!(-42.0); 

rust-analyzer version: 1.87.0-nightly (be73c1f 2025-03-21)

rustc version: rustc 1.87.0-nightly (be73c1f 2025-03-21)

[vishruth-thimmaiah]

@rustbot claim

[pedrocarlo]

Having this same issue where the rustc can correctly expand the macro with negative integers and floats, but RA cannot. I use extensively this macro, so I am getting red squiggles everywhere

macro:

sqlite_values!(-1)

RA

// Recursive expansion of sqlite_values! macro
// ============================================

<[_]>::into_vec(
    #[rustc_box]
    alloc::boxed::Box::new([(<[_]>::into_vec(
        #[rustc_box]
        alloc::boxed::Box::new([(::rusqlite::types::Value::Integer())]),
    ))]),
)

rustc

<[_]>::into_vec(
            #[rustc_box]
            ::alloc::boxed::Box::new([
                <[_]>::into_vec(
                    #[rustc_box]
                    ::alloc::boxed::Box::new([::rusqlite::types::Value::Integer(-1i64)]),
                ),
            ]),
        ),