This is documentation for Mathematica 4, which was
based on an earlier version of the Wolfram Language.
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FilledSmallSquare$MessagePrePrint is a global variable whose value, if set, is applied to expressions before they are included in the text of messages.

FilledSmallSquare The default value of $MessagePrePrint is Short.

FilledSmallSquare$MessagePrePrint is applied after each expression is wrapped with HoldForm.

FilledSmallSquare See The Mathematica Book: Section 2.8.21 and Section 2.13.1.

FilledSmallSquare See also: $PrePrint.