fix mononoke build

[ahornby]

fix mononoke build

Makes usage of anyhow::Error::backtrace() conditional on fbcode_build. This is necessary because the cargo build of anyhow disables its backtrace features when using RUSTC_BOOTSTRAP=1

For oss cargo build to work on current rustc stable 1.73+ I hid the #![feature(provide_any)] usage by making it condition on fbcode_build.

Test plan:

local build with ./build/fbcode_builder/getdeps.py --allow-system-packages build --src-dir=. mononoke

github CI, done by regenerating the mononoke github actions with: ./build/fbcode_builder/getdeps.py --allow-system-packages generate-github-actions --free-up-disk --src-dir=. --output-dir=.github/workflows --job-name="Mononoke " --job-file-prefix=mononoke_ mononoke

Before, broken

After, works

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[xavierd]

For build to work on current rustc stable 1.73+ I had to remove the #![feature(provide_any)] usage. You may need to be on rustc 1.73+ internally to import this successfully

It looks like our internal build is unfortunately failing to build. The compiler is sending us to rust-lang/rust#96024 which appears to still be open. Can you re-send this PR while keeping the feature?

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[ahornby]

It looks like our internal build is unfortunately failing to build. The compiler is sending us to rust-lang/rust#96024 which appears to still be open. Can you re-send this PR while keeping the feature?

done, added in cfg_attr usage to keep it off in oss build but on otherwise

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This pull request has been merged in 41e6e88.