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Implement standard traits on C-unwind ABI function pointers #100

Description

@lopopolo

Proposal

Implement the standard set of core traits on C-unwind ABI function pointers:

Problem statement

I would like to stabilize RFC rust-lang/rfcs#2945 which has tracking Issue rust-lang/rust#74990. Implementing common traits like fmt::Debug on these function pointers is blocking stabilization of the c_unwind feature.

Motivation, use-cases

The lack of common traits like fmt::Debug on C-unwind ABI function pointers prevents them from being used with common tools like bindgen.

Solution sketches

rust-lang/rust#101263 has been filed and signed off on by the compiler team.

Links and related work

What happens now?

This issue is part of the libs-api team API change proposal process. Once this issue is filed the libs-api team will review open proposals in its weekly meeting. You should receive feedback within a week or two.

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    ACP-acceptedAPI Change Proposal is accepted (seconded with no objections)api-change-proposalA proposal to add or alter unstable APIs in the standard libraries

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