Defining the function (>>) does not yield a helpful error

[j14159]

Given:

module m

let (>>) f g x =
  g (f x)

The Alpaca compiler will crash in alpaca_scanner:infer_breaks/1 with a bad match here because inferring breaks tracks whether or not the procedure is inside a binary expression.

Expected: at minimum, a syntax error as we see when defining the function (<<) though perhaps the ideal is to say "this is not legal for use outside a binary expression" or something like that. Maybe we need a set of "symbols" like <<, >>, | that are not permitted as function names?