ignore

ignore -- function mapping any value to unit

This can be used to ignore the result of an expression, e.g. the
instance returned by a constructor or the value returned by a fuction.

Ex. with these features

hello is
say "Hello!"

say_and_inc(x i32) i32 =>
say x
x+1

the results can be ignored as follows

hello |> ignore
(say_and_inc 42) |> ignore
ignore hello
ignore (say_and_inc 42)
_ := hello
_ := say_and_inc 42