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This requires enabling the derive feature flag.
$ 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