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What changed
Adds the C++ WAM
is_list/1builtin to the extracted runtime template. It accepts[]and finite proper[|]/2spines, rejects open/improper/non-list/unbound values, and rejects cyclic spines with a pointer-identity Floyd walk. Success advances the program counter; failure preserves normal WAM backtracking behavior.Adds generator and focused C++ regression coverage for proper, improper, open, cyclic, non-list, unbound, continuation, and CLI argument cases.
Validation
swipl --on-error=halt -q -g run_tests -t halt tests/test_wam_cpp_is_list.plswipl --on-error=halt -q -g "run_tests(wam_cpp_generator:cpp_e2e_builtin_is_list)" -t halt tests/test_wam_cpp_generator.plswipl --on-error=halt -q -g run_tests -t halt tests/test_wam_cpp_generator.pl(408/408)