Change the return type of the main function
#865
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Since Rust 1.61.0, the `main` function can return a type that implements the `Termination` trait. By this, the `main` function can return custom exit codes, so use this.
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Since Rust 1.61.0, the
mainfunction can return a type that implements theTerminationtrait. By this, themainfunction can return custom exit codes, so use this.This replaces
std::process::exit(). Also, usingstd::process::ExitCodefor the return type, considering the possibility of using the own exit code.Also, I am replacing
exitcodewithsysexitsfor return the system exit code constants as defined by<sysexits.h>from themainfunction.ref: Announcing Rust 1.61.0