Destructuring bind failures in compiler on syntactically defective code

[Paul F. Dietz]

(compile nil '(lambda (&key ((x) 1)) x))

==>

error while parsing arguments to DESTRUCTURING-BIND:
  too few elements in
    (X)
  to satisfy lambda list
    (SB-C::KEYWORD-NAME SB-C::VAR):
  exactly 2 expected, but got 1
   [Condition of type SB-KERNEL::ARG-COUNT-ERROR]

[Paul F. Dietz (paul-f-dietz)]

This is just one example of how that can failure. Very easy to generate other defective lambda lists that cause unhandled errors to be thrown.

[Paul F. Dietz (paul-f-dietz)]

There are also problems with malformed MACROLET. If those are not fixed with this ticket I'll open another one.

[Douglas Katzman (dougk)]

fixed in https://sourceforge.net/p/sbcl/sbcl/ci/77038b9a9d068db532224f32c408ed8b65ae8a92/