5

Accommodate yield points in the format_args expansion by dtolnay · Pull Request...

 2 years ago
source link: https://github.com/rust-lang/rust/pull/93461
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dtolnay commented 19 days ago

Fixes #93274.

For the case println!("{} {:?}", "", async {}.await) in the issue, the expansion before:

::std::io::_print(
    ::core::fmt::Arguments::new_v1(
        &["", " ", "\n"],
        &[
            ::core::fmt::ArgumentV1::new(&"", ::core::fmt::Display::fmt),
            ::core::fmt::ArgumentV1::new(&async {}.await, ::core::fmt::Debug::fmt),
        ],
    ),
);

After:

::std::io::_print(
    ::core::fmt::Arguments::new_v1(
        &["", " ", "\n"],
        &match (&"", &async {}.await) {
            _args => [
                ::core::fmt::ArgumentV1::new(_args.0, ::core::fmt::Display::fmt),
                ::core::fmt::ArgumentV1::new(_args.1, ::core::fmt::Debug::fmt),
            ],
        },
    ),
);

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