Derive Macro DebugNoInline 

#[derive(DebugNoInline)]

Derive macro equivalent to #[derive(Debug)] but with #[inline(never)] on the generated fmt implementation.

Rust’s built-in Debug derive emits #[inline] on fmt. For large or deeply nested types — typically error enums formatted on fan-out paths — that lets rustc inline the whole Debug tree into every {:?} / ?err call site, which can bloat binary size. This derive preserves the exact Debug output and only changes the inlining hint.

Use it for large/nested types whose Debug is formatted in hot or fan-out paths; keep #[derive(Debug)] for small, hot, leaf types. See docs/development/rust-performance-principles.md, “Derived trait impls are #[inline]”.

Example

use vtcode_macros::DebugNoInline;

#[derive(DebugNoInline)]
pub struct Widgets {
    foo: u32,
    bar: usize,
}

assert_eq!(
    format!("{:?}", Widgets { foo: 1, bar: 2 }),
    "Widgets { foo: 1, bar: 2 }"
);