clarify that debug_assert does not completely omits the code #62527
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TIL that debug_assert is implemented using `if cfg!(debug_assertions)` rather than `#[cfg(debug_assertions)]`. This means one can not use API gated with `#[cfg(debug_assertions)]` in `debug_assert` family of macros.
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r? @Centril r=me with changes ^--- |
Co-Authored-By: Mazdak Farrokhzad <[email protected]>
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clarify that debug_assert does not completely omits the code TIL that debug_assert is implemented using `if cfg!(debug_assertions)` rather than `#[cfg(debug_assertions)]`. This means one can not use API gated with `#[cfg(debug_assertions)]` in `debug_assert` family of macros.
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clarify that debug_assert does not completely omits the code TIL that debug_assert is implemented using `if cfg!(debug_assertions)` rather than `#[cfg(debug_assertions)]`. This means one can not use API gated with `#[cfg(debug_assertions)]` in `debug_assert` family of macros.
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Rollup of 9 pull requests Successful merges: - #62417 (Fix ICEs when `Self` is used in type aliases) - #62450 (Raise the default recursion limit to 128) - #62470 (Prevent shrinking of "crate select" element on Firefox) - #62515 (cli: make help output for -l and -L consistent) - #62520 (Regression test for issue 42574.) - #62526 (normalize use of backticks in compiler messages for libsyntax/feature_gate.rs) - #62527 (clarify that debug_assert does not completely omits the code) - #62535 (ci: Configure $CI_JOB_NAME correctly) - #62541 (Add spastorino for rustc-guide toolstate) Failed merges: r? @ghost
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☔ The latest upstream changes (presumably #62542) made this pull request unmergeable. Please resolve the merge conflicts. |
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The `debug_assert!` family of macros are guarded by an `if cfg!(debug_assertions)`, _not_ a `#[cfg(debug_assertions)]` attribute. This means that the code in the assertion is still type checked in release mode, and using code that only exists in debug mode will thus fail in release mode. See rust-lang/rust#62527. Therefore, since the `shard.tid` field has a `#[cfg(debug_assertions)]` attribute on it, it's necessary to also put that attribute on the assertions that use that field. cc @kleimkuhler, since you had previously asked why putting the cfg attribute on these assertions was necessary (#1625 (comment)). I thought you might nbe interested in seeing the answer. :) Signed-off-by: Eliza Weisman <[email protected]>
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TIL that debug_assert is implemented using
if cfg!(debug_assertions)rather than
#[cfg(debug_assertions)]. This means one can not use APIgated with
#[cfg(debug_assertions)]indebug_assertfamily ofmacros.