do-symbols

(do-symbols (var [package [result]]) body...)

Evaluates the body once per symbol ACCESSIBLE in package -- the current package when omitted -- with var bound to the symbol, then evaluates result with var bound to nil and returns its value (nil when no result form is given). Accessible means the symbols the package owns, internal and external alike, plus the exports it inherits through its use list; each is spelled against the package that owns it, so a package using cl yields the bare cl names. The symbols come in sorted order.

This is an interpreter-only operator, like do-external-symbols: the compiled backends carry no package registry at run time, so a call reaching them is a compile error. Inside a #. read-time form it works everywhere, because the macro-time evaluator resolves it before compilation.