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Language reference / fail_fast

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Meaning and placement

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task → for_each

Whether the fan-out abandons the batch on the first failure · default true. False finishes every item and yields null at a failed index, so the batch reports what it could. In the same object: items · max_items · max_parallel Schema source (use the pointer above)

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In a source template

Excerpt from templates/bounded-batch.nika, source lines 48–57. This is a fragment, not a runnable workflow.
illustration

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Templates containing this field

These are literal key occurrences in the source files, not an execution or conformance claim. How to instantiate a template.

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Contract and implementation

This page projects the named specification revision. Check released engine status and the validation workflow before running a file. An optional field is not evidence that every engine supports every value. Canonical identity: language:word:fail_fast. Spec revision: 5c40ba456c53. How documentation stays connected.