C64-dev/newLang/planning/claims/E00-S02.md

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story: E00-S02 owner: e00-grammar-fixtures status: done started: 2026-11-07 depends-on: [E00-S01]

E00-S02 Claim

Intended change

Create accepted and rejected Nova128 grammar fixtures plus a coverage manifest and structural validator. This story adds no parser or compiler implementation.

File area

• tests/grammar/
• planning/claims/E00-S02.md

Acceptance evidence

• At least one accepted fixture covers every declaration and statement form.
• Rejected fixtures cover missing terminators, invalid line continuation, duplicate declarations, and malformed interface/class headers.
• Fixtures remain within the editor source profile.
• Expected symbolic diagnostic IDs are named.

Coordination notes

• E01-S01 is active in another file area.
• Diagnostic IDs are symbolic placeholders for E02-S04; this story does not assign numeric values.

Work log

• Read canonical documents and compiler-design guidance.
• Confirmed E00-S01 is complete and no grammar claim exists.
• Added seven accepted fixtures and eleven rejected fixtures with diagnostic sidecars.
• Added a production/statement coverage matrix and structural validator.

Completion

• Tests run: powershell -NoProfile -ExecutionPolicy Bypass -File tests/grammar/validate.ps1
• Results: grammar fixtures ok: 7 accepted, 11 rejected; longest source line is 59 bytes and every fixture is below all editor-profile limits.
• Files changed: tests/grammar/**, planning/claims/E00-S02.md
• Remaining risks: numeric diagnostic assignments belong to E02-S04; these fixtures intentionally specify symbolic IDs only. Parser execution evidence cannot exist until the parser stories are implemented.