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type Position struct {
	Filename     string // filename, if any
	Offset       int    // byte offset, starting at 0. It's set to -1 if not provided.
	LineNumber   int    // line number, starting at 1
	ColumnNumber int    // column number, starting at 1 (character count per line)
}

type Positioner interface {
	// Position returns the current position.
	// Useful in error logging, e.g. {{ errorf "error in code block: %s" .Position }}.
	Position() Position
}