# Declarations

    -- fn1(x)
    #x + 2 + 3

# Invalid Declarations

    -- fn0 not declared: fn3(x)
    #fn0 * #x

    -- infinite loop: fn3(x)
    #fn3(1) * #x

# Invalid Calls

-   fn1(1, $action: "foo") has invalid rkwarg value
-   fn1(1, $act: "shift") has invalid rkwarg
-   fn1(fn4()); \fn4() is not declared

Invalid calls and declarations generate and collects errors.