giles 7d6df6fd5f cl: Phase 3 conditions + restarts — handler-bind, handler-case, restart-case, 55 tests (123 total runtime) ...

define-condition with 15-type ANSI hierarchy (condition/error/warning/
simple-error/simple-warning/type-error/arithmetic-error/division-by-zero/
cell-error/unbound-variable/undefined-function/program-error/storage-condition).

cl-condition-of-type? walks the hierarchy; cl-make-condition builds tagged
dicts {:cl-type "cl-condition" :class name :slots {...}}. cl-signal-obj
walks cl-handler-stack for non-unwinding dispatch. cl-handler-case and
cl-restart-case use call/cc escape continuations for unwinding. All stacks
are mutable SX globals (the built-in handler-bind/restart-case only accept
literal AST specs — not computed lists). Key fix: cl-condition-of-type?
captures cl-condition-classes at define-time via let-closure to avoid
free-variable failure through env_merge parent chain.

55 tests in lib/common-lisp/tests/conditions.sx, wired into test.sh.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-05 11:14:04 +00:00

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