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feat(errors): recoverable failures as values — try/else over ok/err results (#46)
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A fallible function returns a `result` value, built with ok(payload) on success
or err(message) on failure. The caller recovers a value with `try EXPR else {
… }`: on ok the whole expression is the payload; on err the else block runs —
with the failure message bound to `error` — and its trailing expression supplies
the fallback. It is a plain branch on the result's tag: no exceptions, no hidden
control flow, nothing unwinds. is_ok(r) / is_err(r) classify without unwrapping.

Payloads are any i32-width scalar (int/fixed/bool/entity). The feature is
additive and only kicks in when ok/err/try are used, so untouched programs
compile byte-identically (verified) and the C-free bootstrap fixpoint holds.
Complements panic/assert from #8 (the unrecoverable half). The optional
top-level frame `recover` stays deferred (needs a frame-abort mechanism); the
full tagged-union/any generalization is tracked in #1.

Adds the `try` keyword and ok/err/is_ok/is_err builtins across the compiler,
the vocabulary header, JetBrains + TextMate/VSCode grammars, the docs inventory
and pages, examples/library/recover.ludic, and a regression case.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-08-31 15:04:14 +03:00
parent 498593311f
commit 0d1b09e4f0
21 changed files with 16590 additions and 15566 deletions
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1
tools/x/test.ludic
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@ -203,6 +203,7 @@ function cmd_test() -> int {
spec_case("library/testing", "== 6 passed, 0 failed ==")
spec_case("library/coverage", "== 3 passed, 0 failed ==")
feat_case("library/errors", "", "5 10 0 7 1", "errors.ludic (assert guards an invariant, holds -> runs to the end; issue #8 success path)")
feat_case("library/recover", "", "2600 100 1 1 42 7", "recover.ludic (try/else recovers a result value + fallback, error binding, is_ok/is_err; issue #46)")
panic_case()
feat_case("library/logging", "", "0 5 2 1", "logging.ludic (Log levels, set_level/level threshold, structured fields)")
# Os known-folders/arch and Fs.list read the BSD utsname/dirent layout, so