Constructor call syntax
=======================

Option 1: Some kind of function-like call:

    list <- new List
    str <- fromInt String i
    # special handling for "new...", "make...", ... ?
    # or just accept that there's an ambigiuity of
    # constructors vs local variables vs constants?
    List list <- new
    String str <- fromInt i
    # How about parametric types
    List of int list <- new
    List int list <- new
    List Int list <- new
    list: List of int = new
    list: List Int = new
    # Or name-based typing
    itemList <- new
    # (Maybe have some more compact syntax for common types
    #  such as lists and maps?)
    Int+ list <- new
    Int* list <- new
    Int: list <- new
    [Int] list <- new
    Int[] list <- new
    []Int list <- new
    Int>String map <- new
    Int=String map <- new
    Int:String map <- new
    Int+String map <- new
    [Int]String map <- new
    Int[String] map <- new
    Int[]String map <- new
    String[]Int map <- new

Option 2:

    # Without a constructor name, it calls `new`
    list <- List
    # Calling a specific constructor
    str <- String fromInt i
    # Calling a constructor with args would then require the constructor name:
    list <- List new 16

Option 3:

    List list +
    String str + fromInt i
    List list + new 16

Option 4:

    # Infer what happens from name of function (and variable):
    # new/from is a constructors, other prefixes are normal functions
    list new
    str fromInt i
    list new 16
    # Or with <-
    list <- new
    str <- fromInt i
    list <- new 16

Option 5: (must be combined with another option)

    # Implicitly call constructors before the first time a variable
    # is used. In that case, the default constructor could be called.
    add list 123
    # Implicit calls can only be inserted when ALL code paths would
    # lead to an implicit constructing; mixing implicit and explicit
    # constructions is not allowed!
    if should_add_number
        # Not allowed! Explicitly constructed in the `else` block.
        add list 123
    else
        list <- new
        add list "abc"
    end