What exit code does a Rust program return if main returns an Err

Question

In the current version of Rust (1.43) what exit code does a program produce if you return an Err from main()?

Masklinn · Accepted Answer · 2020-05-07 09:36:20Z

3

The Termination trait is used to get an exit code from whatever main returns. The existing implementations wrap libc's EXIT_SUCCESS or EXIT_FAILURE which... are implementation-defined. But on unix-like systems they're probably 0 and 1.

answered May 7, 2020 at 9:36

Masklinn

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2 Comments

Timmmm Over a year ago

Ah I did find that but figured it wasn't available yet since anyhow::Result doesn't implement it. But seems like there is a default implementation which returns EXIT_SUCCESS/EXIT_FAILURE. Thanks!

Masklinn Over a year ago

@Timmmm there's an implenentation of Termination specifically for Result<(), E> and Result<!, E> in the stdlib. Since anyhow::Result is just a typedef for Result<T, anyhow::Error> it inherits these implementations as long as T is either () or !.

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