Macro bin_version 

macro_rules! bin_version {
    () => { ... };
}

Define constants that hold the git revision and package versions.

Defines two global consts: GIT_REVISION: The git revision as specified by the GIT_REVISION env variable provided at compile time, or the current git revision as discovered by running git describe.

VERSION: The value of the CARGO_PKG_VERSION environment variable concatenated with the value of GIT_REVISION.

Note: This macro must only be used from a binary, if used inside a library this will fail to compile.