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Allegro CL |
ANSI Common Lisp  22 Printer 22.3 Formatted Output
22.3.12 Notes about FORMATFormatted output is performed not only by format, but by certain other functions that accept a format control the way format does. For example, error-signaling functions such as cerror accept format controls.Note that the meaning of nil and t as destinations to format are different than those of nil and t as stream designators. The ~^ should appear only at the beginning of a ~< clause, because it aborts the entire clause in which it appears (as well as all following clauses).
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