Help optimize out backtraces when disabled #92992
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…askrgr Rollup of 13 pull requests Successful merges: - rust-lang#89747 (Add MaybeUninit::(slice_)as_bytes(_mut)) - rust-lang#89764 (Fix variant index / discriminant confusion in uninhabited enum branching) - rust-lang#91606 (Stabilize `-Z print-link-args` as `--print link-args`) - rust-lang#91694 (rustdoc: decouple stability and const-stability) - rust-lang#92183 (Point at correct argument when async fn output type lifetime disagrees with signature) - rust-lang#92582 (improve `_` constants in item signature handling) - rust-lang#92680 (intra-doc: Use the impl's assoc item where possible) - rust-lang#92704 (Change lint message to be stronger for &T -> &mut T transmute) - rust-lang#92861 (Rustdoc mobile: put out-of-band info on its own line) - rust-lang#92992 (Help optimize out backtraces when disabled) - rust-lang#93038 (Fix star handling in block doc comments) - rust-lang#93108 (:arrow_up: rust-analyzer) - rust-lang#93112 (Fix CVE-2022-21658) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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The comment in
rust_backtrace_envsays:but this optimization has regressed, because the only caller of this function had an alternative path that unconditionally (and pointlessly) asked for a full backtrace, so the disabled state couldn't propagate.
I've added a getter for the full format that respects the feature flag, so that the caller will now be able to really optimize out the disabled backtrace path. I've also made
rust_backtrace_envtrivially inlineable when backtraces are disabled.