# Declarations

    -- fn1()
    print("I am in stdout")
    "Wipes it"

    -- fn2()
    1 + 2 + 3

    -- fn3(n)
    #n .. " " .. #n

    -- fn4(a, b)
    #a * #b

# Recursive Declarations

    -- fn5(x)
    #fn2() * x

    -- fn6(y, z)
    #y + #fn2($action: "quote") + #z

    -- fn7(a) 
    #a + #fn4(#a, #fn2())

# Calls

Valid calls:

* fn1($stdout: true) gets stdout instead of evaluation result. 
* fn1($action: "wipe") wipes calls and declarations of this function from source document after all calls.
* fn2($action: "return") returns result after call.
* fn2($action: "hide") hides call from source document after call.
* fn2($action: "quote") quotes it without call.
* fn2($eval: "fn2.txt", $code: "fn2.fnl", $lua: "fn2.lua") writes evaluation results, Fennel code and Lua code.
* fn3(4, $action: "return") has arg and rkwarg.
* fn3($action: "return", 5) has rkwarg and arg.
* fn3($eval: "fn3-4.txt", $code: "fn3-4.fnl", $lua: "fn3-4.lua") writes in same files than below.
* fn4(a: 1, b: 2, $action: "return") has kwargs and rkwarg.
* fn4($action: "return", a: 1, b: 2) has rkwarg and kwargs.
* fn4(a: 1, $action: "return", b: 2) has kwarg, rkwarg and kwarg.
* fn4($eval: "fn3-4.txt", $code: "fn3-4.fnl", $lua: "fn3-4.lua") writes in same files than above.
* fn5(10) calls another function inside.
* fn6(9, 8) calls another quoted function inside.
* fn7(fn7(1)) calls several functions.