Crate features / log
Feature flags · log 0.4.34 · from crates.io 2026-10-24
log features: what each one does, and the line to copy
Short answerlog 0.4.34 has 23 features. Nothing is on by default: turn on what you use. It needs Rust 1.71.0 or newer.
Pick features
Every feature
| Feature | In default | Turns on |
|---|---|---|
alloc | nothing else (a switch the code checks) | |
kv | nothing else (a switch the code checks) | |
kv_serde | kv_std, value-bag/serde, serde | |
kv_std | std, kv, value-bag/error | |
kv_sval | kv, value-bag/sval, sval, sval_ref | |
kv_unstable | kv, value-bag | |
kv_unstable_serde | kv_serde, kv_unstable_std | |
kv_unstable_std | kv_std, kv_unstable | |
kv_unstable_sval | kv_sval, kv_unstable | |
max_level_debug | nothing else (a switch the code checks) | |
max_level_error | nothing else (a switch the code checks) | |
max_level_info | nothing else (a switch the code checks) | |
max_level_off | nothing else (a switch the code checks) | |
max_level_trace | nothing else (a switch the code checks) | |
max_level_warn | nothing else (a switch the code checks) | |
release_max_level_debug | nothing else (a switch the code checks) | |
release_max_level_error | nothing else (a switch the code checks) | |
release_max_level_info | nothing else (a switch the code checks) | |
release_max_level_off | nothing else (a switch the code checks) | |
release_max_level_trace | nothing else (a switch the code checks) | |
release_max_level_warn | nothing else (a switch the code checks) | |
serde | serde_core | |
std | alloc |
dep:x turns on the optional dependency x; x/y turns on feature y of dependency x (with ?, only if x is already on).
MSRV history
The minimum Rust version log declares (rust-version), and the release that changed it:
- 0.4.19 (2023-06-11): Rust 1.60.0
- 0.4.28 (2025-09-03): Rust 1.61.0
- 0.4.29 (2025-12-02): Rust 1.68.0
- 0.4.30 (2026-05-25): Rust 1.71.0
Stuck on an older compiler? Pin the last version that supports it, for example cargo update -p log --precise <version>, or use resolver 3, which picks compatible versions for you.
More on log
Real downloads, dependents and alternatives: log crate data (3.9M real downloads a day, 31,897 dependents).
docs.rs feature list · crates.io · license MIT OR Apache-2.0 · edition 2021
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