section

type Change struct {
	// Position at which the first @ of the header occurs.
	HeaderPos token.Pos

	// Changes can optionally have a name.
	//
	// If any, it is specified between the first pair of @@s in the change.
	Name string

	// Metavariables section of the change.
	Meta Section

	// Position of the second "@@".
	AtPos token.Pos

	// Patch is the patch section of the change. This is the code after the
	// second @@.
	Patch Section

	// Comments in the patch
	Comments []string
}

type Line struct {
	// Position at which this line begins.
	StartPos token.Pos

	// Contents of the line.
	Text []byte
}

type LinePos struct {
	// Offset of the first character of this line.
	Offset int

	// Original position from which this line was extracted.
	Pos token.Pos
}

type Program []*Change

type Section []*Line