Nightly clippy emits `clippy::useless_format` for bare interpolations in dev builds.

[scottfones]

Problem

rust-clippy PR#17060 fixed a false-negative for clippy::useless_format by changing how it resolves a format! call's context inside macros.

In dev builds, this hits ifmt.rs's simple expression block where quote_spanned! { raw.span() => ::std::format!(#raw) } gives the generated format! the user's source span. As a result, the format call is analyzed as the user's code rather than belonging to the macro expansion.

Steps To Reproduce

Steps to reproduce the behavior:

• Create a bare interpolation element.

pub fn clippy_render(label: &str) -> Element {
    rsx! {
        span { "{label}" }
    }
}

• Run cargo +nightly clippy and notice the lint fires.
• Run cargo +nightly clippy --release and notice the lint doesn't fire.

Expected behavior

Clean cargo clippy

Environment:

• Dioxus version: v0.7.9
• Rust version: rustc 1.98.0-nightly (9e2abe0c6 2026-06-16), should hit on any nightly since 2026-05-30
• OS info: Linux (7.0.11-arch1-1)
• App platform: Web

Questionnaire

I would like to fix and I have a solution.