# flag needs an argument: -v

- **ID:** `go/flag-requires-an-argument`
- **Domain:** go
- **Category:** build_error
- **Verification:** ai_generated
- **Fix Rate:** 90%

## Root Cause

A command-line flag that requires an argument was provided without one, causing the flag package to abort.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| go1.21 | active | — | — |
| go1.22 | active | — | — |
| go1.23 | active | — | — |

## Workarounds

1. **Provide the required argument immediately after the flag, either as the next word or with an equals sign, e.g., -v=3 or -v 3.** (95% success)
   ```
   Provide the required argument immediately after the flag, either as the next word or with an equals sign, e.g., -v=3 or -v 3.
   ```
2. **Check the flag definition in the source code to confirm if the flag expects an argument (e.g., using flag.IntVar vs flag.BoolVar).** (80% success)
   ```
   Check the flag definition in the source code to confirm if the flag expects an argument (e.g., using flag.IntVar vs flag.BoolVar).
   ```

## Dead Ends

- **Removing the flag entirely from the command line.** — The flag may be required for the program to function correctly; removing it could lead to different errors. (50% fail)
- **Using a double dash (--) before the flag to stop option parsing.** — The double dash only stops parsing of subsequent arguments; it does not provide the missing argument. (90% fail)