accounts/abi/bind: use anonymous ephemeral call result structs

accounts/abi/bind/template.go

@@ -147,22 +147,17 @@ package {{.Package}}
 	}
 
 	{{range .Calls}}
-		{{if .Structured}}
-			// {{$contract.Type}}{{.Normalized.Name}}Result is the result of the {{.Normalized.Name}} invocation.
-			type {{$contract.Type}}{{.Normalized.Name}}Result struct {
-					{{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type}}
-					{{end}}
-			}
-		{{end}}
-
 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.Id}}.
 		//
 		// Solidity: {{.Original.String}}
-		func (_{{$contract.Type}} *{{$contract.Type}}Caller) {{.Normalized.Name}}(opts *bind.CallOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}{{$contract.Type}}{{.Normalized.Name}}Result,{{else}}{{range .Normalized.Outputs}}{{bindtype .Type}},{{end}}{{end}} error) {
-			var (
-				{{if .Structured}}ret = new({{$contract.Type}}{{.Normalized.Name}}Result){{else}}{{range $i, $_ := .Normalized.Outputs}}ret{{$i}} = new({{bindtype .Type}})
-				{{end}}{{end}}
-			)
+		func (_{{$contract.Type}} *{{$contract.Type}}Caller) {{.Normalized.Name}}(opts *bind.CallOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type}};{{end}} },{{else}}{{range .Normalized.Outputs}}{{bindtype .Type}},{{end}}{{end}} error) {
+			{{if .Structured}}ret := new(struct{
+				{{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type}}
+				{{end}}
+			}){{else}}var (
+				{{range $i, $_ := .Normalized.Outputs}}ret{{$i}} = new({{bindtype .Type}})
+				{{end}}
+			){{end}}
 			out := {{if .Structured}}ret{{else}}{{if eq (len .Normalized.Outputs) 1}}ret0{{else}}[]interface{}{
 				{{range $i, $_ := .Normalized.Outputs}}ret{{$i}},
 				{{end}}
@@ -174,14 +169,14 @@ package {{.Package}}
 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.Id}}.
 		//
 		// Solidity: {{.Original.String}}
-		func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}{{$contract.Type}}{{.Normalized.Name}}Result, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type}},{{end}} {{end}} error) {
+		func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type}};{{end}} }, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type}},{{end}} {{end}} error) {
 		  return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.CallOpts {{range .Normalized.Inputs}}, {{.Name}}{{end}})
 		}
 
 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.Id}}.
 		//
 		// Solidity: {{.Original.String}}
-		func (_{{$contract.Type}} *{{$contract.Type}}CallerSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}{{$contract.Type}}{{.Normalized.Name}}Result, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type}},{{end}} {{end}} error) {
+		func (_{{$contract.Type}} *{{$contract.Type}}CallerSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type}};{{end}} }, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type}},{{end}} {{end}} error) {
 		  return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.CallOpts {{range .Normalized.Inputs}}, {{.Name}}{{end}})
 		}
 	{{end}}