rust-lang / rust-lang/rfcs

Add a location! macro for creating a std::panic::Location

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Description

The standard library already has file!, line! and column! macros which return values expressing the location in the code where the macro was called. If I need to pass these values around I usually just want to wrap them into some kind of struct which holds all three values. The standard library already has a struct which does just this - std::panic::Location - but there's no way to construct one (other than by panicking).

Could we just add another macro, next to file!/line!/column!, which creates a Location directly?

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Research direction

Start by reviewing the proposed relationship between file!, line!, column!, and std::panic::Location, then check the repository's RFC process before proposing an implementation. Done would mean a resolved design for a location! macro and an accepted RFC or documented decision.

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Assessment

Tech stack
rust
Domain
compilers
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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