Tracking Issue for integrating `Error` trait with panic interfaces

[DebugSteven]

Feature gate: #![feature(error_in_panic)]

This is a tracking issue for integrating the Error trait with panic interfaces.

This allows panic handlers to access the richer Error trait interface when reporting panics that have a runtime error as their source.

Public API

/// core::panic

impl PanicInfo<'_> {
    pub fn source(&self) -> Option<&(dyn Error + 'static)>;
}

Steps / History

• ACP: Integrate Error trait with panic interfaces libs-team#124
• Implementation: Error in panic #103169
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• How should this actually be invoked? What should be the final interface?
• How do we integrate this with expect and unwrap? (More detail in the ACP)

Footnotes

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩