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Showing content from https://doc.rust-lang.org/nightly/nightly-rustc/rustc_errors/trait.EmissionGuarantee.html below:

EmissionGuarantee in rustc_errors - Rust

pub trait EmissionGuarantee: Sized {
    type EmitResult = Self;

    // Required method
    fn emit_producing_guarantee(diag: Diag<'_, Self>) -> Self::EmitResult;
}

Trait for types that Diag::emit can return as a “guarantee” (or “proof”) token that the emission happened.

This exists so that bugs and fatal errors can both result in ! (an abort) when emitted, but have different aborting behaviour.

Implementation of Diag::emit, fully controlled by each impl of EmissionGuarantee, to make it impossible to create a value of Self::EmitResult without actually performing the emission.

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

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