Early exit on proc-macro invocation gives out unhelpful system error message

Code

//! entry/src/main.rs

#[makro::makro(does not matter)]
#[derive(Debug)]
struct AlsoDoesNotMatter;

fn main() {
    let doesnt = AlsoDoesNotMatter;
    println!("{doesnt:#?}");
}

//! makro/src/lib.rs

use proc_macro::TokenStream;

#[proc_macro_attribute]
pub fn makro(attr : TokenStream , _item : TokenStream) -> TokenStream {
     println!("{attr}");
     std::process::exit(0);
}

Current output

error: could not execute process `target/debug/entry` (never executed)

Caused by:
  No such file or directory (os error 2)

Desired output

error: failed proc macro invocation

--> src/main.rs:9:15

  |
9 | #[makro::makro(does not matter)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this macro failed to run

help: output from this macro

---START---
does not matter
--- END ---

help : this macro exited with the exit code : 0. if this macro is written in Rust, make sure that your proc macro function returns a `proc_macro::TokenStream` and refrain from using early exit measures such as `std::process::exit` and prefer healthier abrupt exit methods such as using `panic!()`

Rationale and extra context

None that I can think of

Other cases

This was found through iterating multiple times on another issue #160671, before running cargo clean the output was more like this:

   Compiling entry v0.1.0 (/home/evopot/code/stringify/entry)
does not matter
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.02s
     Running `target/debug/entry`

Rust Version

evopot@DESKTOP-8NT487B ~/c/s/entry (master)> rustc --version --verbose
rustc 1.97.1 (8bab26f4f 2026-07-14)
binary: rustc
commit-hash: 8bab26f4f68e0e26f0bb7960be334d5b520ea452
commit-date: 2026-07-14
host: x86_64-unknown-linux-gnu
release: 1.97.1
LLVM version: 22.1.6

Anything else?

No :)

Reproduce the failure using entry/src/main.rs and makro/src/lib.rs, starting with the proc-macro attribute invocation and its process-exit behavior. Trace how the compiler handles the terminated proc-macro process and compare it with the requested diagnostic. Done means early exit produces a useful proc-macro error that includes the macro location and captured output.