Cargo Features

lazy-panic has no features set by default.

[dependencies]
lazy-panic = { version = "1.0.0", features = ["backtrace-on"] }
backtrace-on = backtrace

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

backtrace backtrace-on?