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Help:
```console
$ typed-derive fn-parser --help
Usage: typed-derive fn-parser [OPTIONS]
Options:
-D <KEY=VALUE> Hand-written parser for tuples
-h, --help Print help
```
Defines (key-value pairs)
```console
$ typed-derive fn-parser -D Foo=10 -D Alice=30
FnParser(FnParser { defines: [("Foo", 10), ("Alice", 30)] })
$ typed-derive fn-parser -D Foo
? failed
error: invalid value 'Foo' for '-D <KEY=VALUE>': invalid KEY=value: no `=` found in `Foo`
For more information, try '--help'.
$ typed-derive fn-parser -D Foo=Bar
? failed
error: invalid value 'Foo=Bar' for '-D <KEY=VALUE>': invalid digit found in string
For more information, try '--help'.
```
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