cobc-oracle-rs vs gnucobol-rs vs test-lang

Drives the GnuCOBOL cobc compiler as an oracle: builds/runs COBOL fixtures and captures deterministic, canonical-JSON receipts (oracle identity, stdout/stderr/exit, source/generated-C/binary sha256). GPL-3.0+ tooling for the gnucobol-rs compatibility court.

Faithful Rust port of GnuCOBOL packed-decimal (COMP-3), zoned, and display numeric byte semantics and the MOVE conversions between them, proven byte-identical against the GnuCOBOL 3.2 libcob oracle. Plus a PIC->field-model parser , DATA DIVISION record-layout engine, , COPY+REPLACING copybook expander, pure-Rust decimal arithmetic, VALUE initial-record images, PIC P-scaling, OCCURS DEPENDING ON physical-max layout, LEVEL-88 condition-name predicates, and SET-TO-TRUE byte construction. Not a compiler; not arithmetic.

Compiler snapshot test harness for tokens, ASTs, and errors.