// different comment groups when they are concatenated into a single group
var separator = &Comment{token.NoPos, "//"}

// MergePackageFiles creates a file AST by merging the ASTs of the
// files belonging to a package. The mode flags control merging behavior.
func MergePackageFiles(pkg *Package, mode MergeMode) *File {
	// Count the number of package docs, comments and declarations across

		{"LabeledStmt.Stmt", Field, 0},
		{"Lbl", Const, 0},
		{"MapType", Type, 0},
		{"MapType.Key", Field, 0},
		{"MapType.Map", Field, 0},
		{"MapType.Value", Field, 0},
		{"MergeMode", Type, 0},
		{"MergePackageFiles", Func, 0},
		{"NewCommentMap", Func, 1},
		{"NewIdent", Func, 0},
		{"NewObj", Func, 0},
		{"NewPackage", Func, 0},
		{"NewScope", Func, 0},
		{"Node", Type, 0},
		{"NotNilFilter", Func, 0},