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Make const panic!("..") work in Rust 2021. #86998

Merged
merged 9 commits into from
Jul 29, 2021
Merged

Make const panic!("..") work in Rust 2021. #86998

merged 9 commits into from
Jul 29, 2021

Commits on Jul 28, 2021

  1. Make const panic!("..") work in Rust 2021. 

    During const eval, this replaces calls to core::panicking::panic_fmt and
std::panicking::being_panic_fmt with a call to a new const fn:
core::panicking::const_panic_fmt. That function uses
fmt::Arguments::as_str() to get the str and calls panic_str with that
instead.

panic!() invocations with formatting arguments are still not accepted,
as the creation of such a fmt::Arguments cannot be done in constant
functions right now.
    @m-ou-se
    m-ou-se committed Jul 28, 2021
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  2. Update test output for const fmt::Arguments constructor.

    @m-ou-se
    m-ou-se committed Jul 28, 2021
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  3. Add test for const panic in Rust 2021.

    @m-ou-se
    m-ou-se committed Jul 28, 2021
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  4. Add new const_format_args!() macro and use it in panics.

    @m-ou-se
    m-ou-se committed Jul 28, 2021
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  5. Use unreachable_unchecked in const_panic_fmt.

    @m-ou-se
    m-ou-se committed Jul 28, 2021
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  6. Make const_fmt_args!() work during bootstrap.

    @m-ou-se
    m-ou-se committed Jul 28, 2021
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  7. Check that const_panic_fmt is const too.

    @m-ou-se
    m-ou-se committed Jul 28, 2021
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  8. Improve comments about const panic handling 

    Co-authored-by: Ralf Jung <post@ralfj.de>
    @m-ou-se @RalfJung
    m-ou-se and RalfJung committed Jul 28, 2021
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  9. Extend documentation of const_format_args!().

    @m-ou-se
    m-ou-se committed Jul 28, 2021
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