Struct CliUnstable 

pub struct CliUnstable {

    pub print_im_a_teapot: bool,
    pub unstable_options: bool,
    pub no_index_update: bool,
    pub avoid_dev_deps: bool,
    pub minimal_versions: bool,
    pub package_features: bool,
    pub advanced_env: bool,
    pub config_include: bool,
    pub dual_proc_macros: bool,
    pub mtime_on_use: bool,
    pub named_profiles: bool,
    pub binary_dep_depinfo: bool,
    pub build_std: Option<Vec<String>>,
    pub timings: Option<Vec<String>>,
    pub doctest_xcompile: bool,
    pub panic_abort_tests: bool,
    pub jobserver_per_rustc: bool,
    pub features: Option<Vec<String>>,
    pub crate_versions: bool,
}

A parsed representation of all unstable flags that Cargo accepts.

Cargo, like rustc, accepts a suite of -Z flags which are intended for gating unstable functionality to Cargo. These flags are only available on the nightly channel of Cargo.

This struct doesn’t have quite the same convenience macro that the features have above, but the procedure should still be relatively stable for adding a new unstable flag:

1. First, add a field to this CliUnstable structure. All flags are allowed to have a value as the -Z flags are either of the form -Z foo or -Z foo=bar, and it’s up to you how to parse bar.

2. Add an arm to the match statement in CliUnstable::add below to match on your new flag. The key (k) is what you’re matching on and the value is in v.

3. (optional) Add a new parsing function to parse your datatype. As of now there’s an example for bool, but more can be added!

4. In Cargo use config.cli_unstable() to get a reference to this structure and then test for your flag or your value and act accordingly.

If you have any trouble with this, please let us know!

Fields

print_im_a_teapot: bool

unstable_options: bool

no_index_update: bool

avoid_dev_deps: bool

minimal_versions: bool

package_features: bool

advanced_env: bool

config_include: bool

dual_proc_macros: bool

mtime_on_use: bool

named_profiles: bool

binary_dep_depinfo: bool

build_std: Option<Vec<String>>

timings: Option<Vec<String>>

doctest_xcompile: bool

panic_abort_tests: bool

jobserver_per_rustc: bool

features: Option<Vec<String>>

crate_versions: bool

Implementations

impl CliUnstable

pub fn parse(&mut self, flags: &[String]) -> CargoResult<()>

pub fn fail_if_stable_opt(&self, flag: &str, issue: u32) -> CargoResult<()>

Generates an error if -Z unstable-options was not used. Intended to be used when a user passes a command-line flag that requires -Z unstable-options.

Trait Implementations

impl Debug for CliUnstable

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for CliUnstable

fn default() -> CliUnstable

Returns the “default value” for a type.