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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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bump: minor
type: feat
Recoverable failures as values (#46) — a fallible function returns a `result` (a new value type), built with `ok(payload)` on success or `err(message)` on failure, and 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 the stack. `is_ok(r)` / `is_err(r)` classify a result without unwrapping it. Payloads are any i32-width scalar (int/fixed/bool/entity); the whole feature is additive and only kicks in when `ok`/`err`/`try` are used, so programs that don't touch it compile byte-identically. Complements `panic`/`assert` from #8, which handle the unrecoverable programmer-bug half. The optional top-level frame `recover` remains deferred (it needs a frame-abort/unwind mechanism); the full tagged-union/`any` generalization is tracked in #1.