inancgumus/learngo · error

wrong input: %v (line #%d)

Error message

wrong input: %v (line #%d)

What it means

Pointer-based parse() returning *parser from newParser(): rejects lines whose field count is not exactly two; the error is recorded in p.lerr, freezing the parser so later lines are ignored. The line counter p.lines reflects the current (offending) line.

Source

Thrown at 26-pointers/05-log-parser-pointers-vs-values/parser.go:48

	p.lines++

	fields := strings.Fields(line)
	if len(fields) != 2 {
		p.lerr = fmt.Errorf("wrong input: %v (line #%d)", fields, p.lines)
		return
	}

	var err error

	r.domain = fields[0]

View on GitHub (pinned to 3c475a78e5)

Solutions

1. Inspect p.lerr after the parse loop and report the bad line.
2. Pre-filter the log to remove lines lacking exactly two columns.
3. Fix the offending line in the input file.

When it happens

Trigger: Thrown at 26-pointers/05-log-parser-pointers-vs-values/parser.go:48 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/65cd71440e183f83. Report an issue: GitHub.