multiple generic types in one interface

fixtures/genericinterface/genericinterface.go

@@ -2,20 +2,36 @@ package genericinterface
 
 //go:generate go run github.com/maxbrunsfeld/counterfeiter/v6 -generate
 
-type CustomType any
+type CustomTypeT any
+type CustomTypeU any
 
 //counterfeiter:generate . GenericInterface[T CustomType]
-type GenericInterface[T CustomType] interface {
+type GenericInterface[T CustomTypeT] interface {
 	ReturnT() T
 	TakeT(T)
 	TakeAndReturnT(T) T
 	DoSomething()
 }
 
 //counterfeiter:generate . GenericInterface2
-type GenericInterface2[T CustomType] interface {
+type GenericInterface2[T CustomTypeT] interface {
 	ReturnT() T
 	TakeT(T)
 	TakeAndReturnT(T) T
 	DoSomething()
 }
+
+//counterfeiter:generate . GenericInterfaceMultipleTypes
+type GenericInterfaceMultipleTypes[T CustomTypeT, U CustomTypeU] interface {
+	ReturnT() T
+	ReturnU() U
+	ReturnTAndU() (T, U)
+	TakeT(T)
+	TakeU(U)
+	TakeTAndU(T, U)
+	TakeAndReturnT(T) T
+	TakeAndReturnU(U) U
+	TakeAndReturnTAndU(T, U) (T, U)
+	TakeTAndReturnU(T) U
+	DoSomething()
+}