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@span .cmt {-#!/bin/sh}

tmp@span .op {-=$(}@span .fn {-mktemp}@span .op {-)}
@span .fn {-trap} @span .str {-"rm -f $tmp"} EXIT
@span .fn {-cmd2} @span .op {->}$tmp
@span .fn {-cmd1} @span .op {-|} @span .fn {-diff} - $tmp