Use the "nice E0277 errors"[1] for `!Send` `impl Future` from foreign...
source link: https://github.com/rust-lang/rust/pull/89889
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Partly address #78543 by making the error quieter.
We don't have access to the typeck tables from foreign crates, so we
used to completely skip the new code when checking foreign crates. Now,
we carry on and don't provide as nice output (we don't clarify what is
making the Future: !Send), but at least we no longer emit a sea of
derived obligations in the output.
r? @tmandry
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