Understand the failure.
Verify the repair.
Small, reproducible software failures. The broken implementation, the fix that didn’t work, and the one that passed—preserved together.
Explore the cases ↓How results are verified ↗WHAT THE ARCHIVE CONTAINS
100840 executable cases. 20168 are open.
Every case records the implementation that fails, the fix that did not work, and the repair that passed its checks—with recorded outputs and source hashes. This release adds 100840 cases across 20168 failure mechanisms and 254 domains.
The open tier gives you the failure and the unsuccessful fix for one case in every mechanism. The remaining 80672 cases, 5 variants per mechanism, are member-only: the verified repair, its recorded checks, and the full fixture suite are held in the member archive. Read the methodology ↗
A RECORD OF WHAT WENT WRONG
Browse the archive / 100840
Metadata parsing retains its control introducer · case 01
A structured table violates the declared record or column contract.
Metadata parsing retains its control introducer · case 02
A structured table violates the declared record or column contract.
Metadata parsing retains its control introducer · case 03
A structured table violates the declared record or column contract.
Metadata parsing retains its control introducer · case 04
A structured table violates the declared record or column contract.
Metadata parsing retains its control introducer · case 05
A structured table violates the declared record or column contract.
Ditto expansion copies the previous first column into every cell · case 01
A structured table violates the declared record or column contract.
Ditto expansion copies the previous first column into every cell · case 02
A structured table violates the declared record or column contract.
Ditto expansion copies the previous first column into every cell · case 03
A structured table violates the declared record or column contract.
Ditto expansion copies the previous first column into every cell · case 04
A structured table violates the declared record or column contract.
Ditto expansion copies the previous first column into every cell · case 05
A structured table violates the declared record or column contract.
Ditto expansion reads the first row forever · case 01
A structured table violates the declared record or column contract.
Ditto expansion reads the first row forever · case 02
A structured table violates the declared record or column contract.
Ditto expansion reads the first row forever · case 03
A structured table violates the declared record or column contract.
Ditto expansion reads the first row forever · case 04
A structured table violates the declared record or column contract.
Ditto expansion reads the first row forever · case 05
A structured table violates the declared record or column contract.
An explicit empty cell is interpreted as another ditto marker · case 01
A structured table violates the declared record or column contract.
An explicit empty cell is interpreted as another ditto marker · case 02
A structured table violates the declared record or column contract.
An explicit empty cell is interpreted as another ditto marker · case 03
A structured table violates the declared record or column contract.
An explicit empty cell is interpreted as another ditto marker · case 04
A structured table violates the declared record or column contract.
An explicit empty cell is interpreted as another ditto marker · case 05
A structured table violates the declared record or column contract.
A doubled ditto marker is emitted without unescaping · case 01
A structured table violates the declared record or column contract.
A doubled ditto marker is emitted without unescaping · case 02
A structured table violates the declared record or column contract.
A doubled ditto marker is emitted without unescaping · case 03
A structured table violates the declared record or column contract.
A doubled ditto marker is emitted without unescaping · case 04
A structured table violates the declared record or column contract.
A doubled ditto marker is emitted without unescaping · case 05
A structured table violates the declared record or column contract.
A reset marker clears the current cell but not future inheritance · case 01
A structured table violates the declared record or column contract.
A reset marker clears the current cell but not future inheritance · case 02
A structured table violates the declared record or column contract.
A reset marker clears the current cell but not future inheritance · case 03
A structured table violates the declared record or column contract.
A reset marker clears the current cell but not future inheritance · case 04
A structured table violates the declared record or column contract.
A reset marker clears the current cell but not future inheritance · case 05
A structured table violates the declared record or column contract.
Blank lines vote against a valid delimiter · case 01
A structured table violates the declared record or column contract.
Blank lines vote against a valid delimiter · case 02
A structured table violates the declared record or column contract.
Blank lines vote against a valid delimiter · case 03
A structured table violates the declared record or column contract.
Blank lines vote against a valid delimiter · case 04
A structured table violates the declared record or column contract.
Blank lines vote against a valid delimiter · case 05
A structured table violates the declared record or column contract.
A delimiter absent from some records remains eligible · case 01
A structured table violates the declared record or column contract.
A delimiter absent from some records remains eligible · case 02
A structured table violates the declared record or column contract.
A delimiter absent from some records remains eligible · case 03
A structured table violates the declared record or column contract.
A delimiter absent from some records remains eligible · case 04
A structured table violates the declared record or column contract.
A delimiter absent from some records remains eligible · case 05
A structured table violates the declared record or column contract.
A ragged delimiter candidate defeats a stable dialect · case 01
A structured table violates the declared record or column contract.
A ragged delimiter candidate defeats a stable dialect · case 02
A structured table violates the declared record or column contract.
A ragged delimiter candidate defeats a stable dialect · case 03
A structured table violates the declared record or column contract.
A ragged delimiter candidate defeats a stable dialect · case 04
A structured table violates the declared record or column contract.
A ragged delimiter candidate defeats a stable dialect · case 05
A structured table violates the declared record or column contract.
Dialect ranking ignores the number of supporting records · case 01
A structured table violates the declared record or column contract.
Dialect ranking ignores the number of supporting records · case 02
A structured table violates the declared record or column contract.
Dialect ranking ignores the number of supporting records · case 03
A structured table violates the declared record or column contract.
Dialect ranking ignores the number of supporting records · case 04
A structured table violates the declared record or column contract.
Dialect ranking ignores the number of supporting records · case 05
A structured table violates the declared record or column contract.
A later delimiter replaces an equally supported earlier candidate · case 01
A structured table violates the declared record or column contract.
A later delimiter replaces an equally supported earlier candidate · case 02
A structured table violates the declared record or column contract.
A later delimiter replaces an equally supported earlier candidate · case 03
A structured table violates the declared record or column contract.
A later delimiter replaces an equally supported earlier candidate · case 04
A structured table violates the declared record or column contract.
A later delimiter replaces an equally supported earlier candidate · case 05
A structured table violates the declared record or column contract.
Delimiter scoring does not retain the winning score · case 01
A structured table violates the declared record or column contract.
Delimiter scoring does not retain the winning score · case 02
A structured table violates the declared record or column contract.
Delimiter scoring does not retain the winning score · case 03
A structured table violates the declared record or column contract.
Delimiter scoring does not retain the winning score · case 04
A structured table violates the declared record or column contract.
Delimiter scoring does not retain the winning score · case 05
A structured table violates the declared record or column contract.
Missing cells force otherwise numeric columns to text · case 01
A structured table violates the declared record or column contract.
Missing cells force otherwise numeric columns to text · case 02
A structured table violates the declared record or column contract.
Missing cells force otherwise numeric columns to text · case 03
A structured table violates the declared record or column contract.
Missing cells force otherwise numeric columns to text · case 04
A structured table violates the declared record or column contract.
Missing cells force otherwise numeric columns to text · case 05
A structured table violates the declared record or column contract.
A quoted number drives numeric schema inference · case 01
A structured table violates the declared record or column contract.
A quoted number drives numeric schema inference · case 02
A structured table violates the declared record or column contract.
A quoted number drives numeric schema inference · case 03
A structured table violates the declared record or column contract.
A quoted number drives numeric schema inference · case 04
A structured table violates the declared record or column contract.
A quoted number drives numeric schema inference · case 05
A structured table violates the declared record or column contract.
Identifier-looking zero-padded cells infer an integer column · case 01
A structured table violates the declared record or column contract.
Identifier-looking zero-padded cells infer an integer column · case 02
A structured table violates the declared record or column contract.
Identifier-looking zero-padded cells infer an integer column · case 03
A structured table violates the declared record or column contract.
Identifier-looking zero-padded cells infer an integer column · case 04
A structured table violates the declared record or column contract.
Identifier-looking zero-padded cells infer an integer column · case 05
A structured table violates the declared record or column contract.
Type evidence leaks across physical columns · case 01
A structured table violates the declared record or column contract.
Type evidence leaks across physical columns · case 02
A structured table violates the declared record or column contract.
Type evidence leaks across physical columns · case 03
A structured table violates the declared record or column contract.
Type evidence leaks across physical columns · case 04
A structured table violates the declared record or column contract.
Type evidence leaks across physical columns · case 05
A structured table violates the declared record or column contract.
Column inference uses only the last non-null value · case 01
A structured table violates the declared record or column contract.
Column inference uses only the last non-null value · case 02
A structured table violates the declared record or column contract.
Column inference uses only the last non-null value · case 03
A structured table violates the declared record or column contract.
Column inference uses only the last non-null value · case 04
A structured table violates the declared record or column contract.
Column inference uses only the last non-null value · case 05
A structured table violates the declared record or column contract.
An all-null column is reported as a text column · case 01
A structured table violates the declared record or column contract.
An all-null column is reported as a text column · case 02
A structured table violates the declared record or column contract.
An all-null column is reported as a text column · case 03
A structured table violates the declared record or column contract.
An all-null column is reported as a text column · case 04
A structured table violates the declared record or column contract.
An all-null column is reported as a text column · case 05
A structured table violates the declared record or column contract.
A renamed column resolves only one alias hop · case 01
A structured table violates the declared record or column contract.
A renamed column resolves only one alias hop · case 02
A structured table violates the declared record or column contract.
A renamed column resolves only one alias hop · case 03
A structured table violates the declared record or column contract.
A renamed column resolves only one alias hop · case 04
A structured table violates the declared record or column contract.
A renamed column resolves only one alias hop · case 05
A structured table violates the declared record or column contract.
A cyclic column alias is accepted as a physical column · case 01
A structured table violates the declared record or column contract.
A cyclic column alias is accepted as a physical column · case 02
A structured table violates the declared record or column contract.
A cyclic column alias is accepted as a physical column · case 03
A structured table violates the declared record or column contract.
A cyclic column alias is accepted as a physical column · case 04
A structured table violates the declared record or column contract.
A cyclic column alias is accepted as a physical column · case 05
A structured table violates the declared record or column contract.
INSPECTABLE BY DESIGN
Every result has a runnable source.
Runnable implementations with recorded outputs, source hashes, and explicit contracts. Related variants share a failure mechanism and belong together in evaluation splits.
Read the methodology ↗