Add TYPECASE type-based pattern matching with narrowing#102
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Implements TYPECASE/CASE/CASE ELSE/END TYPECASE control structure for branching on runtime class type with ISA semantics (walks parent chain). Inside each CASE block, the variable is narrowed to the matched type so subclass members become accessible via ->. - Add _isa_check runtime function (isa.s) for parent-chain type check - Add typecasesym keyword, typecase_statement() parser (~120 lines) - Add error messages 98-101 for TYPECASE diagnostics - Add tests: typecase.b (ISA dispatch), typecase_narrow.b (narrowing) - Update IDE autocase/syntax/quickinfo and docs/quickref.txt Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Implements TYPECASE/CASE/CASE ELSE/END TYPECASE control structure for branching on runtime class type with ISA semantics (walks parent chain). Inside each CASE block, the variable is narrowed to the matched type so subclass members become accessible via ->.