Currently when you compile a teal program it adds the code to load the compatibility library in the first line. Pushing whatever you wrote there way to the left.
This makes it pretty easy to miss that bit of code when looking at the compiled output. As such, maybe it isn't a bad idea for the compiler to emit a warning when this line is used?
In addition, Lua has support for a file to start with #!. This makes it possible to make a lua file that can just be executed from the terminal without invoking Lua yourself.
Teal has no way to emit this line nor a way to have it be inside the teal file as a way to invoke the teal compiler automatically.