cl-debugger-hook global (nil = default), cl-invoke-debugger walks the hook,
cl-error-with-debugger routes unhandled errors through the hook, and
make-policy-debugger builds a hook from a (fn (condition restarts) name)
policy function. Tests: hook receives condition, policy selects use-zero/abort
restarts, compute-restarts visible inside hook, handler wins before hook fires,
infinite-recursion guard. Wired into test.sh program suite runner.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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>
Type predicates, arithmetic, chars (inline α/digit/case),
format, gensym, values, sets, radix, list utilities.
cl-empty? guards all list traversal against () vs nil in sx_server.
Load spec/stdlib.sx in test.sh to expose format.
Fix lib/r7rs.sx number->string to use (= (len r) 0) not (nil? r).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
