Provided by: cargo_0.62.0ubuntu1-0ubuntu2_amd64 bug

NAME

       cargo-fix - Automatically fix lint warnings reported by rustc

SYNOPSIS

       cargo fix [options]

DESCRIPTION

       This Cargo subcommand will automatically take rustc's suggestions from diagnostics like
       warnings and apply them to your source code. This is intended to help automate tasks that
       rustc itself already knows how to tell you to fix!

       Executing cargo fix will under the hood execute cargo-check(1). Any warnings applicable to
       your crate will be automatically fixed (if possible) and all remaining warnings will be
       displayed when the check process is finished. For example if you'd like to apply all fixes
       to the current package, you can run:

           cargo fix

       which behaves the same as cargo check --all-targets.

       cargo fix is only capable of fixing code that is normally compiled with cargo check. If
       code is conditionally enabled with optional features, you will need to enable those
       features for that code to be analyzed:

           cargo fix --features foo

       Similarly, other cfg expressions like platform-specific code will need to pass --target to
       fix code for the given target.

           cargo fix --target x86_64-pc-windows-gnu

       If you encounter any problems with cargo fix or otherwise have any questions or feature
       requests please don't hesitate to file an issue at <https://github.com/rust-lang/cargo>.

   Edition migration
       The cargo fix subcommand can also be used to migrate a package from one edition
       <https://doc.rust-lang.org/edition-guide/editions/transitioning-an-existing-project-to-a-new-edition.html>
       to the next. The general procedure is:

        1. Run cargo fix --edition. Consider also using the --all-features flag if your project
           has multiple features. You may also want to run cargo fix --edition multiple times
           with different --target flags if your project has platform-specific code gated by cfg
           attributes.

        2. Modify Cargo.toml to set the edition field
           <https://doc.rust-lang.org/cargo/reference/manifest.html#the-edition-field> to the new
           edition.

        3. Run your project tests to verify that everything still works. If new warnings are
           issued, you may want to consider running cargo fix again (without the --edition flag)
           to apply any suggestions given by the compiler.

       And hopefully that's it! Just keep in mind of the caveats mentioned above that cargo fix
       cannot update code for inactive features or cfg expressions. Also, in some rare cases the
       compiler is unable to automatically migrate all code to the new edition, and this may
       require manual changes after building with the new edition.

OPTIONS

   Fix options
       --broken-code
           Fix code even if it already has compiler errors. This is useful if cargo fix fails to
           apply the changes. It will apply the changes and leave the broken code in the working
           directory for you to inspect and manually fix.

       --edition
           Apply changes that will update the code to the next edition. This will not update the
           edition in the Cargo.toml manifest, which must be updated manually after cargo fix
           --edition has finished.

       --edition-idioms
           Apply suggestions that will update code to the preferred style for the current
           edition.

       --allow-no-vcs
           Fix code even if a VCS was not detected.

       --allow-dirty
           Fix code even if the working directory has changes.

       --allow-staged
           Fix code even if the working directory has staged changes.

   Package Selection
       By default, when no package selection options are given, the packages selected depend on
       the selected manifest file (based on the current working directory if --manifest-path is
       not given). If the manifest is the root of a workspace then the workspaces default members
       are selected, otherwise only the package defined by the manifest will be selected.

       The default members of a workspace can be set explicitly with the
       workspace.default-members key in the root manifest. If this is not set, a virtual
       workspace will include all workspace members (equivalent to passing --workspace), and a
       non-virtual workspace will include only the root crate itself.

       -p spec..., --package spec...
           Fix only the specified packages. See cargo-pkgid(1) for the SPEC format. This flag may
           be specified multiple times and supports common Unix glob patterns like *, ? and [].
           However, to avoid your shell accidentally expanding glob patterns before Cargo handles
           them, you must use single quotes or double quotes around each pattern.

       --workspace
           Fix all members in the workspace.

       --all
           Deprecated alias for --workspace.

       --exclude SPEC...
           Exclude the specified packages. Must be used in conjunction with the --workspace flag.
           This flag may be specified multiple times and supports common Unix glob patterns like
           *, ? and []. However, to avoid your shell accidentally expanding glob patterns before
           Cargo handles them, you must use single quotes or double quotes around each pattern.

   Target Selection
       When no target selection options are given, cargo fix will fix all targets (--all-targets
       implied). Binaries are skipped if they have required-features that are missing.

       Passing target selection flags will fix only the specified targets.

       Note that --bin, --example, --test and --bench flags also support common Unix glob
       patterns like *, ? and []. However, to avoid your shell accidentally expanding glob
       patterns before Cargo handles them, you must use single quotes or double quotes around
       each glob pattern.

       --lib
           Fix the package's library.

       --bin name...
           Fix the specified binary. This flag may be specified multiple times and supports
           common Unix glob patterns.

       --bins
           Fix all binary targets.

       --example name...
           Fix the specified example. This flag may be specified multiple times and supports
           common Unix glob patterns.

       --examples
           Fix all example targets.

       --test name...
           Fix the specified integration test. This flag may be specified multiple times and
           supports common Unix glob patterns.

       --tests
           Fix all targets in test mode that have the test = true manifest flag set. By default
           this includes the library and binaries built as unittests, and integration tests. Be
           aware that this will also build any required dependencies, so the lib target may be
           built twice (once as a unittest, and once as a dependency for binaries, integration
           tests, etc.). Targets may be enabled or disabled by setting the test flag in the
           manifest settings for the target.

       --bench name...
           Fix the specified benchmark. This flag may be specified multiple times and supports
           common Unix glob patterns.

       --benches
           Fix all targets in benchmark mode that have the bench = true manifest flag set. By
           default this includes the library and binaries built as benchmarks, and bench targets.
           Be aware that this will also build any required dependencies, so the lib target may be
           built twice (once as a benchmark, and once as a dependency for binaries, benchmarks,
           etc.). Targets may be enabled or disabled by setting the bench flag in the manifest
           settings for the target.

       --all-targets
           Fix all targets. This is equivalent to specifying --lib --bins --tests --benches
           --examples.

   Feature Selection
       The feature flags allow you to control which features are enabled. When no feature options
       are given, the default feature is activated for every selected package.

       See the features documentation
       <https://doc.rust-lang.org/cargo/reference/features.html#command-line-feature-options> for
       more details.

       --features features
           Space or comma separated list of features to activate. Features of workspace members
           may be enabled with package-name/feature-name syntax. This flag may be specified
           multiple times, which enables all specified features.

       --all-features
           Activate all available features of all selected packages.

       --no-default-features
           Do not activate the default feature of the selected packages.

   Compilation Options
       --target triple
           Fix for the given architecture. The default is the host architecture. The general
           format of the triple is <arch><sub>-<vendor>-<sys>-<abi>. Run rustc --print
           target-list for a list of supported targets.

           This may also be specified with the build.target config value
           <https://doc.rust-lang.org/cargo/reference/config.html>.

           Note that specifying this flag makes Cargo run in a different mode where the target
           artifacts are placed in a separate directory. See the build cache
           <https://doc.rust-lang.org/cargo/guide/build-cache.html> documentation for more
           details.

       -r, --release
           Fix optimized artifacts with the release profile. See also the --profile option for
           choosing a specific profile by name.

       --profile name
           Fix with the given profile.

           As a special case, specifying the test profile will also enable checking in test mode
           which will enable checking tests and enable the test cfg option. See rustc tests
           <https://doc.rust-lang.org/rustc/tests/index.html> for more detail.

           See the the reference <https://doc.rust-lang.org/cargo/reference/profiles.html> for
           more details on profiles.

       --ignore-rust-version
           Fix the target even if the selected Rust compiler is older than the required Rust
           version as configured in the project's rust-version field.

       --timings=fmts
           Output information how long each compilation takes, and track concurrency information
           over time. Accepts an optional comma-separated list of output formats; --timings
           without an argument will default to --timings=html. Specifying an output format
           (rather than the default) is unstable and requires -Zunstable-options. Valid output
           formats:

           •  html: Write a human-readable file cargo-timing.html to the target/cargo-timings
               directory with a report of the compilation. Also write a report to the same
               directory with a timestamp in the filename if you want to look at older runs. HTML
               output is suitable for human consumption only, and does not provide
               machine-readable timing data.

           •  json (unstable, requires -Zunstable-options): Emit machine-readable JSON
               information about timing information.

   Output Options
       --target-dir directory
           Directory for all generated artifacts and intermediate files. May also be specified
           with the CARGO_TARGET_DIR environment variable, or the build.target-dir config value
           <https://doc.rust-lang.org/cargo/reference/config.html>. Defaults to target in the
           root of the workspace.

   Display Options
       -v, --verbose
           Use verbose output. May be specified twice for "very verbose" output which includes
           extra output such as dependency warnings and build script output. May also be
           specified with the term.verbose config value
           <https://doc.rust-lang.org/cargo/reference/config.html>.

       -q, --quiet
           Do not print cargo log messages. May also be specified with the term.quiet config
           value <https://doc.rust-lang.org/cargo/reference/config.html>.

       --color when
           Control when colored output is used. Valid values:

           •  auto (default): Automatically detect if color support is available on the terminal.

           •  always: Always display colors.

           •  never: Never display colors.

           May also be specified with the term.color config value
           <https://doc.rust-lang.org/cargo/reference/config.html>.

       --message-format fmt
           The output format for diagnostic messages. Can be specified multiple times and
           consists of comma-separated values. Valid values:

           •  human (default): Display in a human-readable text format. Conflicts with short and
               json.

           •  short: Emit shorter, human-readable text messages. Conflicts with human and json.

           •  json: Emit JSON messages to stdout. See the reference
               <https://doc.rust-lang.org/cargo/reference/external-tools.html#json-messages> for
               more details. Conflicts with human and short.

           •  json-diagnostic-short: Ensure the rendered field of JSON messages contains the
               "short" rendering from rustc. Cannot be used with human or short.

           •  json-diagnostic-rendered-ansi: Ensure the rendered field of JSON messages contains
               embedded ANSI color codes for respecting rustc's default color scheme. Cannot be
               used with human or short.

           •  json-render-diagnostics: Instruct Cargo to not include rustc diagnostics in in JSON
               messages printed, but instead Cargo itself should render the JSON diagnostics
               coming from rustc. Cargo's own JSON diagnostics and others coming from rustc are
               still emitted. Cannot be used with human or short.

   Manifest Options
       --manifest-path path
           Path to the Cargo.toml file. By default, Cargo searches for the Cargo.toml file in the
           current directory or any parent directory.

       --frozen, --locked
           Either of these flags requires that the Cargo.lock file is up-to-date. If the lock
           file is missing, or it needs to be updated, Cargo will exit with an error. The
           --frozen flag also prevents Cargo from attempting to access the network to determine
           if it is out-of-date.

           These may be used in environments where you want to assert that the Cargo.lock file is
           up-to-date (such as a CI build) or want to avoid network access.

       --offline
           Prevents Cargo from accessing the network for any reason. Without this flag, Cargo
           will stop with an error if it needs to access the network and the network is not
           available. With this flag, Cargo will attempt to proceed without the network if
           possible.

           Beware that this may result in different dependency resolution than online mode. Cargo
           will restrict itself to crates that are downloaded locally, even if there might be a
           newer version as indicated in the local copy of the index. See the cargo-fetch(1)
           command to download dependencies before going offline.

           May also be specified with the net.offline config value
           <https://doc.rust-lang.org/cargo/reference/config.html>.

   Common Options
       +toolchain
           If Cargo has been installed with rustup, and the first argument to cargo begins with
           +, it will be interpreted as a rustup toolchain name (such as +stable or +nightly).
           See the rustup documentation <https://rust-lang.github.io/rustup/overrides.html> for
           more information about how toolchain overrides work.

       -h, --help
           Prints help information.

       -Z flag
           Unstable (nightly-only) flags to Cargo. Run cargo -Z help for details.

   Miscellaneous Options
       -j N, --jobs N
           Number of parallel jobs to run. May also be specified with the build.jobs config value
           <https://doc.rust-lang.org/cargo/reference/config.html>. Defaults to the number of
           CPUs.

       --keep-going
           Build as many crates in the dependency graph as possible, rather than aborting the
           build on the first one that fails to build. Unstable, requires -Zunstable-options.

ENVIRONMENT

       See the reference <https://doc.rust-lang.org/cargo/reference/environment-variables.html>
       for details on environment variables that Cargo reads.

EXIT STATUS

0: Cargo succeeded.

       •  101: Cargo failed to complete.

EXAMPLES

        1. Apply compiler suggestions to the local package:

               cargo fix

        2. Update a package to prepare it for the next edition:

               cargo fix --edition

        3. Apply suggested idioms for the current edition:

               cargo fix --edition-idioms

SEE ALSO

       cargo(1), cargo-check(1)

                                                                                     CARGO-FIX(1)