inancgumus/learngo · error

wrong input: %v (line #%d)

Error message

wrong input: %v (line #%d)

What it means

Exercise variant of parse(): rejects a log line that does not contain exactly two whitespace-separated fields. The error carries the offending fields slice and p.lines so main can report which line of the log is malformed.

Source

Thrown at 26-pointers/exercises/05-log-parser/parser.go:41

// parse parses a log line and returns the parsed result with an error
func parse(p parser, line string) (parsed result, err error) {
	fields := strings.Fields(line)
	if len(fields) != 2 {
		err = fmt.Errorf("wrong input: %v (line #%d)", fields, p.lines)
		return
	}

	parsed.domain = fields[0]

View on GitHub (pinned to 3c475a78e5)

Solutions

1. Skip malformed lines and continue with the rest of the file.
2. Fix the log line to have exactly domain and visits columns.
3. Stop and surface the line number to the user.

When it happens

Trigger: Thrown at 26-pointers/exercises/05-log-parser/parser.go:41 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of inancgumus/learngo@3c475a78e5 (2026-09-02). Data as JSON: /api/errors/1efffcce060ddf63. Report an issue: GitHub.