Crash on empty source

[xNxExOx]

moinimal example:

let file = ""; // loaded from actual file, but that file can by empty
// ...
        lua.context(|state|{
            state.load(file.as_bytes())
                .exec()
        })?;

produces this error:

thread 'main' panicked at 'rlua internal error: 1 too many stack values popped (this is a bug, please file an issue)', .cargo\registry\src\index.crates.io-6f17d22bba15001f\rlua-0.19.5\src\util.rs:59:17
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library\std\src\panicking.rs:593
   1: core::panicking::panic_fmt
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library\core\src\panicking.rs:67
   2: rlua::util::impl$1::drop
             at .cargo\registry\src\index.crates.io-6f17d22bba15001f\rlua-0.19.5\src\util.rs:59
   3: core::ptr::drop_in_place
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be\library\core\src\ptr\mod.rs:497
   4: rlua::context::Context::load_chunk
             at .cargo\registry\src\index.crates.io-6f17d22bba15001f\rlua-0.19.5\src\context.rs:902
   5: rlua::context::Chunk::into_function
             at .cargo\registry\src\index.crates.io-6f17d22bba15001f\rlua-0.19.5\src\context.rs:988
   6: rlua::context::Chunk::call
             at .cargo\registry\src\index.crates.io-6f17d22bba15001f\rlua-0.19.5\src\context.rs:981
   7: rlua::context::Chunk::exec
             at .cargo\registry\src\index.crates.io-6f17d22bba15001f\rlua-0.19.5\src\context.rs:950
   8: script_validator::validate_with_lua::closure$0

Easy workaround for me is just wrap it with if !file.is_empty(), so not an critical issue for me.

[jugglerchris]

Thanks for the report.
This seems to work on Lua 5.4 (the default) but does indeed panic with Lua 5.1 as above. I'll look into it, thanks!

[jugglerchris]

I believe I've got a fix for the issue: #284