miette 5.3.1

Fancy diagnostic reporting library and protocol for us mere mortals who aren't compiler hackers.
Documentation 
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use super::{error::ErrorImpl, ptr::Ref};
use core::fmt;

impl ErrorImpl<()> {
    pub(crate) unsafe fn display(this: Ref<'_, Self>, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        this.deref()
            .handler
            .as_ref()
            .map(|handler| handler.display(Self::error(this), f))
            .unwrap_or_else(|| core::fmt::Display::fmt(Self::diagnostic(this), f))
    }

    pub(crate) unsafe fn debug(this: Ref<'_, Self>, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        this.deref()
            .handler
            .as_ref()
            .map(|handler| handler.debug(Self::diagnostic(this), f))
            .unwrap_or_else(|| core::fmt::Debug::fmt(Self::diagnostic(this), f))
    }
}