When running ./test/GoTest.sh I get the following errors:
# MyGame/Example
go_gen/src/MyGame/Example/Monster.go:519:66: undefined: InParentNamespace
go_gen/src/MyGame/Example/Monster.go:524:14: undefined: InParentNamespace
FAIL flatbuffers_test [build failed]
This is because InParentNamespace type is defined in another package (MyGame) and go source code generator doesn't generate correct code in this case.