The common-extensions module contains a variety of useful basic extensions to the Dylan language.
The Common Dylan extensions are:
<stretchy-sequence>, <string-table>, difference, fill-table!, find-element, position, remove-all-keys!, and define table.
<format-string-condition>, <simple-condition>, and condition-to-string.
iterate and when.
iterate, debug-message, ignore, ignorable, profiling, timing, $unsupplied, unsupplied?, unsupplied, when, $unfound, one-of, unfound?, and found?.
integer-to-string, string-to-integer, and float-to-string.
See "The COMMON-EXTENSIONS module" on page 19 for reference descriptions of these items.