Tomoaki 7c2b09c647 grammar: add '<<' shift-left safely (Phase 1); map to AST/MIR/VM; keep '>>' as legacy ARROW ...

- Tokenizer: add SHIFT_LEFT for '<<' (before <= detection)
- Parser: introduce parse_shift() layer; left-associative; only '<<' handled in Phase 1
- AST: add BinaryOperator::Shl and display
- MIR builder: map Shl -> BinaryOp::Shl
- Interpreter: implement Shl in both execution paths (integer-only, type error otherwise)

No change to '>>' (legacy ARROW remains). No runtime gate yet for SHL as it does not collide with existing syntax.

2025-09-08 03:44:55 +09:00

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