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flow: railway attempt combinator — fail-value short-circuit + 10 tests (Phase 6)
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(attempt n1 n2 ...) threads like sequence but stops at the first node returning a
(fail ...) value, returning that failure. Makes the fail/recover error model
compose into validation/ETL pipelines (railway-oriented). 132/132 across 8 suites.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-06-06 18:09:21 +00:00
parent 0a1b89c975
commit d9b9da3843
6 changed files with 95 additions and 7 deletions
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lib/flow/scoreboard.md
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@@ -1,6 +1,6 @@
# flow-on-sx Scoreboard
**All tests pass: 122 / 122 across 7 suites. Phases 1-5 complete.**
**All tests pass: 132 / 132 across 8 suites. Phases 1-6 complete.**
`bash lib/flow/conformance.sh`
@@ -15,6 +15,7 @@
| distributed | 19 | Phase 4: `remote-node` (7); `remote-failover` (6); replication + handoff across instances (6) |
| api | 12 | Phase 5: introspection — `flow/status`, `flow/result`, `flow/list`, `flow/pending` |
| combinators | 17 | Phase 5: `tap`, `recover` (fail-value), `map-flow` fan-over-list, `flow-while`/`flow-until` bounded iteration |
| railway | 10 | Phase 6: `attempt` — fail-value short-circuiting sequence + recover rejoin |
## Architecture