const go/types.UntypedNil

16 uses

	go/types (current package)
		api.go#L352: 	return tv.mode == value && tv.Type == Typ[UntypedNil]
		assignments.go#L42: 			if T == nil && x.typ == Typ[UntypedNil] {
		assignments.go#L149: 			if typ == Typ[UntypedNil] {
		basic.go#L40: 	UntypedNil
		expr.go#L680: 		case UntypedNil:
		expr.go#L686: 			return Typ[UntypedNil], nil, 0
		expr.go#L703: 				return Typ[UntypedNil], nil, 0
		expr.go#L712: 			return Typ[UntypedNil], nil, 0
		expr.go#L724: 		return Typ[UntypedNil], nil, 0
		operand.go#L108: 	if x.mode == value && x.typ == Typ[UntypedNil] {
		operand.go#L225: 	return x.mode == value && x.typ == Typ[UntypedNil]
		predicates.go#L125: 		return t.kind != UntypedNil
		universe.go#L66: 	UntypedNil:     {UntypedNil, IsUntyped, "untyped nil"},
		universe.go#L139: 	def(&Nil{object{name: "nil", typ: Typ[UntypedNil], color_: black}})

	golang.org/x/tools/internal/gcimporter
		bimport.go#L1034: 			types.Typ[types.UntypedNil],

The pages are generated with Golds v0.4.9. (GOOS=linux GOARCH=amd64)