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flow: try-catch combinator — reify raised exceptions + 6 tests
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(try-catch node handler) runs node; on a raised exception calls (handler error)
with the reified error via Scheme guard, returns the handler value.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-06-06 16:37:26 +00:00
parent 1731476dc6
commit f3da3b975a
5 changed files with 42 additions and 9 deletions
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6
lib/flow/scoreboard.md
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@@ -1,6 +1,6 @@
# flow-on-sx Scoreboard
**All tests pass: 30 / 30 across 2 suites.**
**All tests pass: 36 / 36 across 2 suites.**
`bash lib/flow/conformance.sh`
@@ -9,7 +9,7 @@
| Suite | Passing | Covers |
|-------|--------:|--------|
| basic | 18 | Phase 1: single nodes, linear sequence, data-flow threading, defflow, parallel fan/join, nested composition, publish-shaped flow |
| control | 12 | Phase 2: `branch` conditional (6); error model `fail`/`failed?`/`fail-reason` failure values that flow as data (6) |
| control | 18 | Phase 2: `branch` (6); error model `fail`/`failed?`/`fail-reason` (6); `try-catch` reifying raised exceptions (6) |
## Architecture
@@ -36,6 +36,6 @@ capture the flow continuation directly.
## Phases
- [x] Phase 1 — Declarative DAG + sequential execution (combinators + 18 tests, `flow/start`)
- [~] Phase 2 — Control flow + error handling (`branch`, error model done)
- [~] Phase 2 — Control flow + error handling (`branch`, error model, `try-catch` done)
- [ ] Phase 3 — Suspend / resume (the showcase)
- [ ] Phase 4 — Distributed nodes via fed-sx