Methods
The receiver comes first. It borrows or it consumes.
main (print)
<counter: hits int>
# A method is a function with its receiver first. A borrowed receiver
# (&) reads; an owned receiver consumes and usually returns the next value.
(c &counter) show() none
print.line("{c.hits}")
(c counter) bump() counter
<*c, hits int: hits + 1>
main()
c = <counter: hits = 0>
c = c.bump().bump()
c.show()2