go build_error ai_generated true

flag needs an argument: -v

ID: go/flag-requires-an-argument

Also available as: JSON · Markdown · 中文
90%Fix Rate
85%Confidence
1Evidence
2023-03-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
go1.21 active — — —
go1.22 active — — —
go1.23 active — — —

Root Cause

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

generic

中文

提供了需要参数的命令行标志但未提供参数，导致 flag 包中止。

Official Documentation

https://pkg.go.dev/flag

Workarounds

  1. 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. 
    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. 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). 
    Check the flag definition in the source code to confirm if the flag expects an argument (e.g., using flag.IntVar vs flag.BoolVar).

中文步骤

  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.
  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).

Dead Ends

Common approaches that don't work:

  1. Removing the flag entirely from the command line. 50% fail

    The flag may be required for the program to function correctly; removing it could lead to different errors.

  2. Using a double dash (--) before the flag to stop option parsing. 90% fail

    The double dash only stops parsing of subsequent arguments; it does not provide the missing argument.