check_function_bodies not doing much

I was trying to get postgres to warn me that I'm referencing a table that
it doesn't exists inside a function so I was told on the IRC to check the
setting "check_function_bodies", however when I use it in a plpgsql
function it doesn't actually check if the tables in the body exist. Is this
the correct behavior?

Example:
http://paste.debian.net/1037080/