Hi, all:
in src/cmd/compile/internal/syntax/nodes.go, why need the aNode() function
in the interface?
type Node interface {
// Pos() returns the position associated with the node as follows:
// 1) The position of a node representing a terminal syntax production
// (Name, BasicLit, etc.) is the position of the respective production
// in the source.
// 2) The position of a node representing a non-terminal production
// (IndexExpr, IfStmt, etc.) is the position of a token uniquely
// associated with that production; usually the left-most one
// ('[' for IndexExpr, 'if' for IfStmt, etc.)
Pos() Pos
aNode()
}
type node struct {
// commented out for now since not yet used
// doc *Comment // nil means no comment(s) attached
pos Pos
}
func (n *node) Pos() Pos { return n.pos }
func (*node) aNode() {}
Thanks!
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