inancgumus/learngo · error

wrong input: %q (line #%d)

Error message

wrong input: %q (line #%d)

What it means

Pointer-based parse(): fires when the visits token cannot be converted by strconv.Atoi or is negative. The error is stored in p.lerr, which stops all subsequent parsing and aggregation; the quoted token and line number identify the exact bad input.

Source

Thrown at 26-pointers/05-log-parser-pointers-vs-values/parser.go:58

	r.domain = fields[0]
	r.visits, err = strconv.Atoi(fields[1])

	if r.visits < 0 || err != nil {
		p.lerr = fmt.Errorf("wrong input: %q (line #%d)", fields[1], p.lines)
	}
	return

View on GitHub (pinned to 3c475a78e5)

Solutions

  1. After parsing, check p.lerr in main and report the invalid line.
  2. Skip lines whose visits column is not a non-negative integer.
  3. Correct the log data at the reported line.
Defensive patterns

Strategy: validation

When it happens

Trigger: Thrown at 26-pointers/05-log-parser-pointers-vs-values/parser.go:58 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/5aa5cbc767e2c14e. Report an issue: GitHub.