WriteExpr(buf, x.Elt)

	case *ast.StructType:
		buf.WriteString("struct{")
		writeFieldList(buf, x.Fields.List, "; ", false)
		buf.WriteByte('}')

	case *ast.FuncType:
		buf.WriteString("func")
		writeSigExpr(buf, x)

	case *ast.InterfaceType:
		buf.WriteString("interface{")
		writeFieldList(buf, x.Methods.List, "; ", true)
		buf.WriteByte('}')

	case *ast.MapType: