compile fail with lua5.1.2

[linsim]

github.com/aarzilli/golua/lua

C:\Users\lingsan\go\pkg\mod\github.com\aarzilli\golua@v0.0.0-20210507130708-11106aa57765\lua\golua_c_lua51.go:114:105: cannot use (func literal)() (type _Ctype_longlong) as type _Ctype_long in return argument

[Alessandro Arzilli]

Can not reproduce, also there is no function literal at that line.