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Cargo / Check With Features

Check With Features

Checks the current package with specified features enabled to test conditional code paths.

Terminal

cargo c -F <feature1,feature2>

cargo c -F <feature1,feature2>

#!/bin/bash

# Check With Features
cargo {{[c|check]}} {{[-F|--features]}} {{feature1,feature2}}

import subprocess

# Check With Features
# Make sure to replace <placeholders> with actual values
def run_command():
    cmd = [
        "cargo",
        "c",
        "-F",
        "<feature1,feature2>"
    ]
    
    try:
        print(f"Executing: {' '.join(cmd)}")
        subprocess.run(cmd, check=True)
    except subprocess.CalledProcessError as e:
        print(f"Error: {e}")
    except FileNotFoundError:
        print("Error: cargo not found. Please install it first.")

if __name__ == "__main__":
    run_command()

When To Use

When developing features that conditionally change application logic, ensuring all paths compile when all specified features are enabled.

Pro Tip

Consider adding `--all-features` for a comprehensive check of the package’s capabilities when multiple features are involved.

Terminal Output

Expected runtime feedback

Simulated preview

Output

Checking for the following features:

 feature1      : enabled
 feature2      : enabled

 Finished dev [unoptimized + debuginfo] target(s) in 0.20s

Anatomy of Output

Understanding the result

Checking `my_package` with features `feature1, feature2`... INFO

Shows which features are activated for the check.

Finished dev [unoptimized + debuginfo] target(s) in 0.30s BUILD STATUS

Status and duration of the check.

error: unresolved import `std::non_existent` ERROR

Points out issues attributed to at least one of the activated features.

Power User Variants

Optimized versions

cargo check --features feature1

Check with a single feature enabled.

cargo check --features feature1,feature2 --release

Check with multiple features enabled in release mode.

Troubleshooting

Common pitfalls

error: missing feature `non_existent_feature`

Solution: Check `Cargo.toml` for the correct spelling of the features.

error: feature `feature1` cannot be disabled at this point

Solution: Ensure you only enable features that are compatible with each other.

warning: type errors due to generic constraints in feature activation

Solution: Adjust type parameters to align with active features.

Command Breakdown

What each part is doing

cargo: Base Command; The executable that performs this operation. Here it runs Cargo before the shell applies any redirect operators.
c: c|check; The value supplied for c|check.
-F: F| features; The value supplied for F| features.
<feature1,feature2>: feature1,feature2; The value supplied for feature1,feature2.
-F: Command Option; Tool-specific option used by this command invocation.

How To Run

Execution path

Step 1
Run: cargo check --features feature1,feature2
Step 2
Verify: Ensure Cargo displays enabled features in the output.

Alternative Approaches

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Alternative programming tools for the same job.

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