Previously Expr::BinOp(String, ...) accepted any string as an operator.
Invalid operators (e.g. "diagonal") would compile fine and silently
return CellValue::Empty at eval time.
Now BinOp is an enum with variants Add/Sub/Mul/Div/Pow/Eq/Ne/Lt/Gt/Le/Ge.
The parser produces enum variants directly; the evaluator pattern-matches
exhaustively with no fallback branch. An invalid operator is now a
compile error at the call site, and the compiler ensures every variant
is handled in both eval_expr and eval_bool.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- model.rs: division by zero now returns Empty instead of 0 so the cell
visually signals the error rather than silently showing a wrong value.
Updated the test to assert Empty.
- parser.rs: missing closing ')' in aggregate functions (SUM, AVG, etc.)
and IF(...) now returns a parse error instead of silently succeeding,
preventing malformed formulas from evaluating with unexpected results.
- dispatch.rs: SetCell validates that every category in the coords
exists before mutating anything; previously a typo in a category name
silently wrote an orphaned cell (stored but never visible in any grid)
and returned ok. Now returns an error immediately.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Removes dead use statements across dispatch, formula, import, model, and
UI modules. Prefixes intentionally unused variables with _ in app.rs,
analyzer.rs, and grid.rs.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
