Generated void * function not returning anything

[oprypin]

When generating qt5.cr I get the following code generated:

extern "C" void * bg_QWidget_qt_metacast_const_char_X(QWidget * _self_, const char * unnamed_arg_0) {
  _self_->qt_metacast(unnamed_arg_0);
}

Meanwhile, the pre-generated branch has the following:

extern "C" void* bg_QWidget_qt_metacast_const_char_X(QWidget *_self_, const char* unnamed_arg_0) {
  return _self_->qt_metacast(unnamed_arg_0);
}

$ llvm-config --version
5.0.0
$ clang --version
clang version 5.0.0 (tags/RELEASE_500/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
$ crystal --version
Crystal 0.23.1 (2017-09-10) LLVM 5.0.0

bindgen$ git status
HEAD detached at 8c946eb
nothing to commit, working tree clean

crystal-qt$ git status
HEAD detached at a570e69
nothing to commit, working tree clean

Code used to generate:

(cd ../crystal-qt && ../bindgen/tool.sh qt.yml && egrep -A2 "bg_QWidget_qt_metacast_const_char_X\(Q" ext/qt_binding.cpp)