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Arg::default_missing_value_os

since 0.1.0

Value for the argument when the flag is present but no value is specified.

name = "prog"
[args]
color = { long = "color", value-name = "COLOR", value-parser = ["always", "auto", "never"], default-value = "auto", num-args = "optional", require-equals = true, default-missing-value-os = "always", help = "Specify WHEN to colorize output." }
Terminal window
prog --color
Terminal window
claptrap_color='always'