Update panic message to include the name of the undefined, important …

google / subcommands

Go subcommand library.

Apache License 2.0

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Update panic message to include the name of the undefined, important … #12

Closed slewiskelly closed 6 years ago

slewiskelly commented 6 years ago

…flag

Adds additional context to the panic; maintainers of CLI tools will be able to (more) quickly determine which important flag has been yet to be defined.