Function can read and modify variables in outside scope

[sjoqvist]

Possibly related to #38.

The 1.2 specification says

Currently, functions do not have access to the outer/calling code block's variables.

Nevertheless, on master, the following code

HAI 1.2
  I HAS A var ITZ "foo"

  HOW IZ I func
    VISIBLE var
    var R "bar"
  IF U SAY SO

  I IZ func MKAY
  VISIBLE var
KTHXBYE

prints

foo
bar

I would have expected an error message about undefined variables.

If a function can in fact modify variables in the outside scope while the specification says that it can't, then it gets harder to track down bugs.