Spec #38.3: Implement 1D array access (read)

[treytomes]

Description

Access array elements in expressions for reading values. Parse array subscript syntax A(i) and distinguish from function calls FNA(i).

ECMA-55 References

• ECMA55-ARR-005: Array subscript syntax
• ECMA55-VAR-012: Subscript bounds checking
• ECMA55-ARR-006: Uninitialized elements are 0

Acceptance Criteria

• Parse A(i) in expressions
• Access returns value at subscript
• Uninitialized elements return 0
• Bounds checking: valid subscripts succeed
• Out-of-bounds access throws error
• Distinguish A(5) array from FNA(5) function
• Works in all expression contexts
• All tests pass
• Test coverage ≥ 80%

Parent Issue

Part of #38 - Implement DIM and OPTION BASE for array support

Estimated Effort

4-5 hours

Dependencies

Depends on Spec #38.2 (DIM statement)