mlua/CHANGELOG.md

[0.14.0]

• Lots of performance improvements, with one major one: Lua handles no longer necessarily point into the registry, they now can instead point into a preallocated stack area. All together, you can expect (VERY rough estimate) somewhere on the order of 30%-60% CPU time reduction in the cost of bindings, depending on usage patterns, but the handle behavior change comes with API breakage.
• API incompatible change: Lua handles now must ONLY be used with the Lua instance from which they were derived. Before, this would work if both instances were from the same base state, but are now restricted to ONLY the matching Lua instance itself. This was previously only possible through unsafe code, Lua::scope, and things like the rental crate which allow self borrowing. For Lua::scope functions, you can use Function::bind, and for everything else you can use the RegistryKey API.
• Several stack size bugfixes that could have lead to unsafety in release mode.
• Another API incompatible change: Lua (and associated handle values) are no longer UnwindSafe / RefUnwindSafe. They should not have been marked as such before, because they are extremely internally mutable, so this can be considered a bugfix. All rlua types should actually be perfectly panic safe as far as internal invariants are concerned, but (afaict) they should not be marked as UnwindSafe due to internal mutability and user invariants.
• Addition of some simple criterion.rs based benchmarking.
• rlua now depends on failure 1.0 and cc 1.0

[0.13.0]

• Small API incompatible change which fixes unsafety: Scope and scope created handle lifetimes have been changed to disallow them from escaping the scope callback. Otherwise, this could lead to dangling registry handles, which can be used to cause UB. This is the only API change for 0.13.
• Small fixes for potential panics / longjmps around the embedded traceback function.
• Temporary fix for #71 that works on stable rust without dirty tricks, while waiting for the larger fix for rust #48251 to make its way to stable.

[0.12.2]

• Some minor documentation fixes.
• Fix for some rare panics which might result in an abort from panicking across a C API boundary.

[0.12.1]

• Fix a stupid bug where AnyUserData::set_user_value / AnyUserData::get_user_value could panic if the ToLua / FromLua type conversion failed.
• Add UserDataMethods::add_function_mut and UserDataMethods::add_meta_function_mut for symmetry.
• Add some more documentation for changes in 0.12, and fix some minor problems.

[0.12.0]

• Changed how userdata values are garbage collected, both to fix potential panics and to simplify it. Now, when userdata is garbage collected, it will be given a special "destructed userdata" metatable, and all interactions with it will error with CallbackDestructed. From the rust side, an expired userdata AnyUserData will not appear to be any rust type.
• Changed the RegistryKey API to be more useful and general. Now, it is not 100% necessary to manually remove RegistryKeys in order to clean up the registry, instead you can periodically call Lua::expire_registry_values to remove registry values with RegistryKeys that have all been dropped. Also, it is no longer a panic to use a RegistryKey from a mismatched Lua instance, it is simply an error.
• Lua is now Send, and all userdata / callback functions have a Send requirement. This is a potentially annoying breaking change, but there is a new way to pass !Send types to Lua in a limited way.
• HUGE change, there is now a Lua::scope method, which allows passing non-'static functions to Lua in a controlled way. It also allows passing !Send functions and !Send userdata to Lua, with the same limitations. In order to make this safe, the scope method behaves similarly to the crossbeam crate's crossbeam::scope method, which ensures that types created within the scope are destructed at the end of the scope. When using callbacks / userdata created within the scope, the callbacks / userdata are guaranteed to be destructed at the end of the scope, and inside Lua references to them are in an invalidated "destructed" state. This destructed state was already possible to observe through __gc methods, so it doesn't introduce anything new, but it has been fixed so that it cannot cause panics, and has a specific error type.
• Correctly error on passing too many arguments to an rlua::Function, and correctly error when returning too many results from a callback. Previously, this was a panic.
• Lua::create_function is now split into Lua::create_function and Lua::create_function_mut, where the first takes a Fn and the second takes a FnMut. This allows for recursion into rust functions if the function is not FnMut. There is a similar change for UserDataMethods, where the mut variants of the functions now take FnMut, and the non-mut variants take Fn. There is not a way to make a non-mut UserDataMethods method with a FnMut function.

[0.11.0]

• rlua::Error now implements failure::Fail and not std::error::Error, and external errors now require failure::Fail. This is the only API incompatible change for 0.11, and my hope is that it is relatively minor. There are no additional bounds on external errors, since there is a blanket impl for T: std::error::Error + Send + Sync of failure::Fail, but rlua::Error no longer implements std::error::Error and there is an additional dependency, and that is more likely to cause breakage.
• protect a call to luaL_ref when creating new userdata types.
• Some documentation improvements for Error, Lua::create_function, and MetaMethod, and a rustdoc warning fix (thanks @jonas-schievink!)
• Expose the RegistryKey type in the API properly, which makes the API around it vastly easier to use! Also fixes a safety hole around using the RegistryKey API with the wrong Lua instance.
• Add an API for "user values", which are arbitrary Lua values that can be attached to userdata.

[0.10.2]

• Registry API for storing values inside the Lua instance, either by string or by automatically generated keys.
• Important memory safety fix for luaL_ref.

[0.10.1]

• Documentation spelling fix

[0.10.0]

• Handle all 'm' functions in the Lua C API correctly, remove LUA_ERRGCMM hacks.
• Lots and lots of internal changes to support handling all 'm' errors
• Change the API in a lot of places due to functions that can trigger the gc now potentially causing Error::GarbageCollectorError errors.

[0.9.7]

• Add unsafe function to load the debug Lua module (thanks @Timidger!)
• Fix setmetatable wrapper with nil metatable (thanks again to @Timidger!)

[0.9.6]

• Fix an annoying bug that made external errors appear to have no further cause errors in the cause chain.

[0.9.5]

• Fix incorrect xpcall behavior
• Change FromLua / ToLua impls for HashMap to be generic over the hasher. This may be technically a backwards incompatible change, but this would be really unusual though, and I don't think it deserves an API bump.

[0.9.4]

• Fix quadratic behavior in Function::bind
• lua_checkstack fixes, particularly fixing a crash bug due to luaL_ref using a single extra stack space.

[0.9.3]

• Soundness fix for recursive function calls, now causes a panic. This is temporary while I work on a more major update that prevents panics / aborts from scripts.

[0.9.2]

• Bugfix, don't load the "base" library into the "base" global variable @jonas-schievink
• Additional documentation work, a link fix for Variadic docs, new crate documentation @jonas-schievink
• Metatable access on Table
• gcc crate warning fix for 0.3.52 and up
• Bugfix for Table::raw_get, now actually calls raw_get and is sound.

[0.9.1]

• Add travis badge

[0.9.0]

• Huge API change, removed the Lua prefix on all types, changes to callback signature that remove the need for manual wrapping and unwrapping in most cases.
• Tons of soundness bugfixes, very few soundness problems remain.
• Tons of documentation and bugifx work @jonas-schievink

[0.8.0]

• Major API change, out of stack space is no longer an Err, you should not be able to run out of stack space by using this API, except through bugs.
• Simplification of error types

[0.7.0]

• API change to remove dependency on error_chain, major changes to error handling strategy to allow Lua to catch and rethrow rust errors sanely.