Rust - Error Handling - Unrecoverable

panic! is how to raise an unrecoverable error.

By default, when a panic occurs, the program starts unwinding by walking up the stack and cleaning up the data for each function. Alternatively, you can abort, which ends the program without cleaning up. Aborting leads to a smaller binary.

In order to make panics abort instead of unwind in production code (to create smaller binaries), you must add the following to your Cargo.toml file:

[profile.release]
panic = 'abort'

Backtrace

Rust provides backtracing. To use do:

$ RUST_BACKTRACE=1 cargo run