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Jakub Piasecki
abe5ff3c56
`when` is the only directive with a sibling `steps:` list, and four runner sites asked `kind === "when"` directly to decide whether a step has authored children to expand as skip lines. A second block directive would have had to remember all four, and a forgotten one silently drops a whole block from the report — exactly the invariant `reportBlockSkipped` exists to hold. This introduces `blockSteps(step)` as the single runtime predicate and `BLOCK_DIRECTIVE_KEYS` as its parse-time counterpart, and extracts the parse-side block plumbing (`assertBlockDepth`, `parseBlockSteps`) that a second directive must share — notably the depth cap, renamed `MAX_BLOCK_DEPTH`, which has to be ONE counter across directives or an alternating nesting chain evades it and reopens the cyclic-YAML-alias hole it was added to close. No behavior change, with one deliberate exception: the depth-cap message now reads `block directives nest deeper than 20 levels` where it said `when blocks nest deeper than 20 levels` — the cap stopped being `when`'s the moment it became shared, and a message naming only `when` would misdirect an author who hit it through a different directive. Every other error message, their ordering, and the report shapes are untouched. 559 flow tests pass unchanged. --- **Stack** 1. **#748 — you are here** · `refactor(flow)`: generalize when's block machinery → `main` 2. #749 · `feat(flow)`: add `repeat:` blocks → #748