case *ast.StructType:
		f.walk(n.Fields, ctxField, visit)
	case *ast.FuncType:
		if tparams := funcTypeTypeParams(n); tparams != nil {
			f.walk(tparams, ctxParam, visit)
		}
		f.walk(n.Params, ctxParam, visit)
		if n.Results != nil {
			f.walk(n.Results, ctxParam, visit)
		}
	case *ast.InterfaceType:
		f.walk(n.Methods, ctxField, visit)
	case *ast.MapType:
		f.walk(&n.Key, ctxType, visit)

pkg go/types, method (*Selection) Obj() Object
pkg go/types, method (*Selection) Recv() Type
pkg go/types, method (*Selection) String() string
pkg go/types, method (*Selection) Type() Type
pkg go/types, method (*Signature) Params() *Tuple
pkg go/types, method (*Signature) Recv() *Var
pkg go/types, method (*Signature) Results() *Tuple
pkg go/types, method (*Signature) String() string
pkg go/types, method (*Signature) Underlying() Type

pkg syscall (netbsd-arm64-cgo), const F_OK = 0
pkg syscall (netbsd-arm64-cgo), const F_OK ideal-int
pkg syscall (netbsd-arm64-cgo), const F_PARAM_MASK = 4095
pkg syscall (netbsd-arm64-cgo), const F_PARAM_MASK ideal-int
pkg syscall (netbsd-arm64-cgo), const F_PARAM_MAX = 4095
pkg syscall (netbsd-arm64-cgo), const F_PARAM_MAX ideal-int
pkg syscall (netbsd-arm64-cgo), const F_RDLCK = 1
pkg syscall (netbsd-arm64-cgo), const F_RDLCK ideal-int

America/Montevideo America/Montreal America/Montserrat America/Nassau America/New_York America/Nipigon America/Nome America/Noronha America/North_Dakota/Beulah America/North_Dakota/Center America/North_Dakota/New_Salem America/Nuuk America/Ojinaga America/Panama America/Pangnirtung America/Paramaribo America/Phoenix America/Port-au-Prince America/Port_of_Spain America/Porto_Acre America/Porto_Velho America/Puerto_Rico America/Punta_Arenas America/Rainy_River America/Rankin_Inlet America/Recife America/Regina...

	}
}

func (w *Walker) writeSignature(buf *bytes.Buffer, sig *types.Signature) {
	if tparams := sig.TypeParams(); tparams != nil {
		w.writeTypeParams(buf, tparams, true)
	}
	w.writeParams(buf, sig.Params(), sig.Variadic())
	switch res := sig.Results(); res.Len() {
	case 0:
		// nothing to do
	case 1:
		buf.WriteByte(' ')
		w.writeType(buf, res.At(0).Type())
	default:
		buf.WriteByte(' ')