Completion of fallback list implementation.

* lib.c (find_symbol): New function.
(symbol_present): Search the fallback list also to
determine whether the symbol is visible.

* lib.h (find_symbol): Declared.

* parser.y (sym_helper): Implement a new behavior for
qualified symbols. Interning new symbols is only allowed
for packages that have an empty fallback list.

* parser.c (get_visible_syms): New static function.
(find_matching_syms): Use get_visible_syms to get
the list of eligible symbols. This way the fallback list
of the package is included if it is the current package.

* share/txr/stdlib/package.tl (defpackage): Do not insert
a default (:use usr) if there is no :usr clause. Since
defpackage is very new, no need for backward compatibility;
the amount of code depending on this is likely zero.

* txr.1: Documented fallback list feature.

0 files changed, 0 insertions, 0 deletions