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core: edn :readers/:default opts; uncaught throws no longer leak the callee's ns

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clojure.edn was nearly complete (sets, #uuid/#inst, :eof all landed earlier);
the :readers opt was ignored and :default missing. Both work now — the
reader stores a tag as a :#name keyword, so the lookup normalizes it to the
symbol Clojure keys :readers with; :default gets (tag value); built-in data
readers stay the fallback. 8 new edn spec rows. This was the last open item
of jolt-0mb (the vendored walk/zip/data/edn battery has been green for a
while: 34/33/61/50, all clean).

Chasing the probe cascade ('Unable to resolve symbol: edn/...' after one
error) found a real evaluator bug: an interpreted fn body runs with
current-ns rebound to its DEFINING ns and restores it with a plain trailing
call — an UNCAUGHT throw skips every restore on the way out, leaving the ctx
stuck in the deepest callee's ns, where alias-qualified lookups then fail
(the same cascade previously seen via sci). The repair lives at the
TOP-LEVEL boundary (loader/eval-toplevel saves the entry ns and restores it
on error before re-raising) — NOT per-call defer/try, which builds a fiber
per frame and blew the C stack on deep interpreted recursion (file-seq)
when tried first. Regression tests cover the cross-eval leak and that
aliases keep resolving.
This commit is contained in:
Yogthos 2026-06-10 18:16:06 -04:00
parent fef99db6d8
commit 6260230231
6 changed files with 87 additions and 9 deletions
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11
test/spec/namespaces-spec.janet
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@ -42,3 +42,14 @@
"(do (require (quote clojure.string)) (alias (quote st2) (quote clojure.string)) (ns-unalias (quote user) (quote st2)) (nil? (get (ns-aliases (quote user)) (quote st2))))"]
["ns-publics has var" "true" "(do (def npv 1) (some? (get (ns-publics (quote user)) (quote npv))))"]
["newline returns nil" "nil" "(newline)"])
# A throw inside an interpreted fn body (or macro expander) must restore the
# caller's current-ns: the body runs with current-ns rebound to the fn's
# DEFINING ns, and an unwind that skipped the restore left the ctx stuck
# there — every later alias-qualified lookup in the REPL ns then failed
# ("Unable to resolve symbol: alias/...", seen via sci + clojure.edn).
(defspec "namespaces / error inside a fn must not leak its defining ns"
["alias survives a throwing stdlib call" "\"A\""
"(do (require (quote [clojure.string :as s9])) (try (s9/join nil nil nil) (catch Exception e nil)) (s9/upper-case \"a\"))"]
["*ns* restored after throw" "\"user\""
"(do (require (quote [clojure.walk :as w9])) (try (w9/postwalk nil nil nil) (catch Exception e nil)) (str *ns*))"])