partially formed union types panic

[jdhenke]

#45 illustrates a test case that should error but currently panics because the generated code dereferences a pointer it assumes is present but may not be at line 97:

conjure-go/integration_test/testgenerated/objects/api/unions.conjure.go

Lines 89 to 107 in 3102e63

	func (u *ExampleUnion) Accept(v ExampleUnionVisitor) error {
	switch u.typ {
	default:
	if u.typ == "" {
	return fmt.Errorf("invalid value in union type")
	}
	return v.VisitUnknown(u.typ)
	case "str":
	return v.VisitStr(*u.str)
	case "strOptional":
	var strOptional *string
	if u.strOptional != nil {
	strOptional = *u.strOptional
	}
	return v.VisitStrOptional(strOptional)
	case "other":
	return v.VisitOther(*u.other)
	}
	}