Start tx holder with gen

_gen.go

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+package main
+
+import (
+	_ "github.com/tendermint/go-wire/gen"
+	_ "github.com/clipperhouse/stringer"
+)

tx.go

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+package basecoin
+
+// TODO: add some common functionality here...
+// +gen wrapper:"Tx"
+type TxInner interface {
+}

txinner_wrapper.go

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+// Generated by: main
+// TypeWriter: wrapper
+// Directive: +gen on TxInner
+
+package basecoin
+
+import (
+	"github.com/tendermint/go-wire/data"
+)
+
+// Auto-generated adapters for happily unmarshaling interfaces
+// Apache License 2.0
+// Copyright (c) 2017 Ethan Frey (ethan.frey@tendermint.com)
+
+type Tx struct {
+	TxInner "json:\"unwrap\""
+}
+
+var TxMapper = data.NewMapper(Tx{})
+
+func (h Tx) MarshalJSON() ([]byte, error) {
+	return TxMapper.ToJSON(h.TxInner)
+}
+
+func (h *Tx) UnmarshalJSON(data []byte) (err error) {
+	parsed, err := TxMapper.FromJSON(data)
+	if err == nil && parsed != nil {
+		h.TxInner = parsed.(TxInner)
+	}
+	return err
+}
+
+// Unwrap recovers the concrete interface safely (regardless of levels of embeds)
+func (h Tx) Unwrap() TxInner {
+	hi := h.TxInner
+	for wrap, ok := hi.(Tx); ok; wrap, ok = hi.(Tx) {
+		hi = wrap.TxInner
+	}
+	return hi
+}
+
+func (h Tx) Empty() bool {
+	return h.TxInner == nil
+}
+
+/*** below are bindings for each implementation ***/