| commit | 8289475b7a545dcfae7aa07a54a3a022fdd648fe | |
| author | Douglas Katzman <dougk@google.com> | |
| Tue, 16 Jun 2015 22:44:55 +0000 (16 18:44 -0400) | ||
| committer | Douglas Katzman <dougk@google.com> | |
| Tue, 16 Jun 2015 22:44:55 +0000 (16 18:44 -0400) | ||
| tree | 730b1e59a2721158db9a7beb5e3052096eea8e7e | treesnapshot (tar.gz zip) |
| parent | 9741c6058a8b09e9cb564486324e540bb402d75b | commitdiff |
Some forward-looking changes for destructuring-bind.
- &OPTIONAL with no variables when unparsing a ds-lambda-list matters.
Otherwise the lambda list (A &OPTIONAL ((&OPTIONAL))) - which is merely "weird"
turns into (A &OPTIONAL (())) which is not only weird, but illegal,
because () is another spelling for NIL, and NIL is a constant.
The former lambda list takes 1 or 2 arguments. The 2nd argument, if supplied,
must be NIL, because it binds to a lambda that accepts zero things.
- Add DS-LAMBDA-LIST-SYMBOLS which extracts all bound symbols.
- &OPTIONAL with no variables when unparsing a ds-lambda-list matters.
Otherwise the lambda list (A &OPTIONAL ((&OPTIONAL))) - which is merely "weird"
turns into (A &OPTIONAL (())) which is not only weird, but illegal,
because () is another spelling for NIL, and NIL is a constant.
The former lambda list takes 1 or 2 arguments. The 2nd argument, if supplied,
must be NIL, because it binds to a lambda that accepts zero things.
- Add DS-LAMBDA-LIST-SYMBOLS which extracts all bound symbols.