treat_err_as_bug - The Rust Unstable Book

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# `treat-err-as-bug`

This feature is perma-unstable and has no tracking issue.

This flag converts the selected error to a `bug!` call, exiting the compiler immediately and allowing you to generate a backtrace of where the error occurred. For full documentation, see the rustc-dev-guide.

Note that the compiler automatically sets `RUST_BACKTRACE=1` for itself, and so you do not need to set it yourself when using this flag.