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Adjusting help message (rust-lang#4865)
On stable, running with `--help|-h` shows information about `file-lines` which is a nightly-only option. This commit removes all mention of `file-lines` from the help message on stable. There is room for improvement here; perhaps a new struct called, e.g., `StableOptions` could be added to complement the existing `GetOptsOptions` struct. `StableOptions` could have a field for each field in `GetOptsOptions`, with each field's value being a `bool` that specifies whether or not the option exists on stable. Or is this adding too much complexity?
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