Crate cerm 

cerm — C Inspired Error Reporting Macros

Cerm (/sɜːm/) provides a few handy macros in the style of BSD C’s <err.h> for error-reporting to the user. These macros just remove some of the boilerplate of having to prefix your diagnostic messages with progname: everytime you want to exit the program.

Macros

err

The same thing as err_code!, but the exit code is always 1.

err_code

Print a diagnostic message to the standard error and exit with a given code.

require

Require that an expression returns Result::Ok or Option::Some.

warn

Print a diagnostic message to the standard error.