Function lint 

pub fn lint(
    lua: &Lua,
    code: &str,
    chunk_name: &str,
) -> Result<LintResult, Error>

Lint code against an existing VM’s environment.

Convenience wrapper that calls register and then LintEngine::lint.

use mlua::prelude::*;

let lua = Lua::new();
lua.globals().set("custom_fn",
    lua.create_function(|_, ()| Ok(42)).unwrap()
).unwrap();

let result = mlua_check::lint(&lua, "custom_fn()", "@test.lua").unwrap();
assert_eq!(result.diagnostics.len(), 0);