0.505

Changes

• Improve error recovery during type checking
• Initial (not fully complete) implementation for singleton types (RFC #37)
• Implement a C-friendly interface for compiler (luacode.h)
• Remove C++ features from lua.h (removed default arguments from luau_load and lua_pushcfunction)
• Fix lua_breakpoint behavior when enabled=false
• Implement coroutine.close (RFC #88)

Community Contributions

• fix unable to find library -lpthread by @leleliu008 in #203

Breaking changes

This release introduces small breaking changes in lua.h (only relevant for embedders):

• luau_load env argument is now required, pass an extra 0
• lua_pushcfunction now must be called with 3 arguments; if you were calling it with 2 arguments, pass an extra NULL; if you were calling it with 4, use lua_pushcclosure.

These changes are necessary to make sure lua.h can be used from pure C - the future release will make it possible by adding an option to luaconf.h to change function name mangling to be C-compatible. We don't anticipate breaking the FFI interface in the future, but this change was necessary to restore C compatibility.