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LDC-E1376 — Test case name not registered

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# LDC-E1376 — Test case name not registered

## What it means

Not triggerable in a hermetic recipe.

A test file that names a case the package never registered gets this diagnostic with the nearest registered names as hints (`case_reference_diagnostics` in the language server). This diagnostic is emitted by the editor surface only — no command-line tool reports it — so no command-line recipe reproduces it. If you meet the code in the editor, read it as "no such case; did you mean one of these" and take one of the suggested names or register the new one.