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4.2.3 ‘-2’: Turn on verbose debugging mode (Fweave)

This option tells Fweave to display detailed reductions of the scraps as it does the pretty-printing. (For a discussion of scraps, see -1.) Sometimes Fweave fails spectacularly at pretty-printing a section, either because of a syntax error on the part of the user or because of a bug in Fweave's logic. This option helps one (usually the system developer!) to figure out why.

This feature can be turned on more locally by means of the ‘@2’ command. See AT2.