Is there a way to find out if a given Lua snippet is a simple expression or a block?

[jqnatividad]

The reason I'm asking is so that I can prepend a return if its just a simple expression, otherwise no. Right now, I have a simple heuristic in the project I maintain that's not that sophisticated...

See dathere/qsv#2526 (reply in thread)

[khvzak]

At the moment this capability is provided in mlua through Chunk::eval function. It automatically detect presence of return statement:

assert_eq!(lua.load("return 1 + 1").eval::<i64>().unwrap(), 2);
assert_eq!(lua.load("1 + 1").eval::<i64>().unwrap(), 2);