Format the binary expression: decide the cutoff and then format. Let's call depth == 1 Normal mode, and depth > 1 Compact mode. (Algorithm suggestion by Russ Cox.) The precedences are: 5 * / % << >> & &^ 4 + - | ^ 3 == != < <= > >= 2
(x *ast.BinaryExpr, prec1, cutoff, depth int)
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