Function identifier lookup
==========================

Types of functions:

* constructors / typeident-based functions
* object functions / methods
* bare functions

Syntax decisions:

* whether to have an explicit or implicit this parameter?
* typed function definitions
* simplified / variant-typed function definitions
* function calls

Syntax with implicit `this` parameter
-------------------------------------

Possible function definition syntax for typed definitions:

    constructor new
        bool shiny
    ...

    func get_item
    returns
        Item
    ...

    static compare_items
        Item a
        Item b
    returns
        bool equal
    ...

Possible function definition syntax for simplified / variant-typed defs:

    constructor new shiny
    ...

    func get_item -> item
    ...

    static compare_items a b -> equal
    ...

Possible function call syntax:

    func item_exists
    func get_item -> item
        # Implicit `this`-parameter
        # See call_vs_field_syntax.txt
        # (but maybe fields can be accessed by first "importing" them
        #  via `modifies`/`accesses` block in the function decl)
        if item_exists
            return retrieve_item
        end
    end

This syntax probably prevents usage of `f obj p1 p2 `... syntax for calls
on other objects due to ambiguities. It probably has to to `obj.f p1 p2`...
instead.