*Jump to [source](keyvalue-derive.rs)*
**This requires enabling the `derive` feature flag.**
```bash
$ keyvalue-derive --help
clap
USAGE:
keyvalue-derive[EXE] [OPTIONS]
OPTIONS:
-D <DEFINES>
-h, --help Print help information
$ keyvalue-derive -D Foo=10 -D Alice=30
Args { defines: [("Foo", 10), ("Alice", 30)] }
$ keyvalue-derive -D Foo
? failed
error: Invalid value for '-D <DEFINES>': invalid KEY=value: no `=` found in `Foo`
For more information try --help
$ keyvalue-derive -D Foo=Bar
? failed
error: Invalid value for '-D <DEFINES>': invalid digit found in string
For more information try --help
```