Ignoring functions returning functions.

Author: nishant-rudderstack

_examples/multireturn/multireturn.go

@@ -100,3 +100,11 @@ func TripleWithInterfaceWithoutErrorFunc() (IntInterFace, IntStrUct, *IntStrUct)
 
 	return &i1700, s1800, &s1900
 }
+
+//// Function returning function /////
+type FunctionType func(input int) int
+func FunctionReturningFunction() FunctionType {
+    return func(input int) int{
+        return input
+    }
+}

_examples/multireturn/test.py

@@ -72,3 +72,6 @@
 ############### Triple Interface Return Without Error ##############
 (interface1700, struct1800, ptr1900) = multireturn.TripleWithInterfaceWithoutErrorFunc()
 print("Triple WithoutError() Return (%r, %r, %r)" % (interface1700.Number(), struct1800.P, ptr1900.P))
+
+############## Function Returning Functions ignored ##############
+assert("FunctionReturningFunction" not in dir(multireturn))

bind/symbols.go

@@ -184,6 +184,10 @@ func isPyCompatFunc(sig *types.Signature) (haserr, hasfun bool, err error) {
 			if isErrorType(result.Type()) {
 				haserr = true
 			}
+			if isFuncType(result.Type()) {
+				err = fmt.Errorf("gopy: Result values of type function are not supported: %s", sig.String())
+				return
+			}
 		}
 	}
 

bind/utils.go

@@ -24,6 +24,11 @@ func isErrorType(typ types.Type) bool {
 	return typ == types.Universe.Lookup("error").Type()
 }
 
+func isFuncType(typ types.Type) bool {
+	_, ok := typ.Underlying().(*types.Signature)
+	return ok
+}
+
 func isStringer(obj types.Object) bool {
 	switch obj := obj.(type) {
 	case *types.Func: