FAILURE MAP
← Case archive

FA-3604 / Lexical grammars / Member archive

An ISBN-13-shaped token admits an unrelated prefix · case 04

An ISBN-13-shaped token admits an unrelated prefix.

Member previewVariant 4 · 3 implementations · 4 checks per implementation

Case contract

Accept exactly thirteen ASCII digits beginning 978 or 979, without checksum validation.

Why this case matters

A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixtureActualExpectedOutcome
boundary 1truefalseFailed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.

Sign in to the archive ↗