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doslang-mirror/fec/tests/m8/README.md
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coolguy d5ba699744 dev: require the pinned toolchain, and clear the QEMU-era leftovers
The host gate accepted a WATCOM environment override and skipped when nothing
was found. Both are wrong for what it is: a system-wide Open Watcom is a
different version reporting different diagnostics, and a gate that skips is a
gate that is not running, which is the exact shape of the problem this file was
added to close. It now uses .dosboxx/watcom only and fails with the setup
command when that is absent, matching how dosboxx.py already behaves.

Nothing else in the project reaches for a system install: the DOS session sets
WATCOM=W: before calling BUILD.BAT, so the C:\DEVEL\WATCOMC fallback inside it
is unreachable.

fec/test-dos.bat was tracked but dead -- the runner generates RUN.BAT and only
copies build-dos.bat -- so it goes, along with the comment claiming it drives
the build and the three fixture READMEs that still pointed at it. The registry
decides what runs now.

(.qemu/ is untracked local debris from the same era and is left alone.)
2026-08-17 02:26:02 +09:00

2.0 KiB

M8 fixtures

M8 is the first multi-unit milestone, so cases live in subdirectories. Each case is compiled separately with that directory on the import path.

Pass cases:

  • basic: public function across units.
  • pubfld: public type and public field across units.
  • dotted and alias: canonical dotted unit paths, last-segment binding, and explicit import aliases.
  • dotpriv: a dotted unit prefix does not grant access to another unit's private declarations.
  • errsame: two units use the same anonymous error.Name; the driver must assign one deterministic core.Error code.
  • errdet: the same anonymous error-name set appears in a different source/import order; generated fe_errors.h must be byte-identical to errsame modulo the intentionally different unit graph.

Fail cases:

  • privfn: private declaration access.
  • privfld: private field access.
  • missing: unresolved import.
  • cycle: cyclic imports.
  • unitbad: filename/unit-name mismatch.
  • badupper and badlong: DOS-safe lowercase, eight-character unit-segment limit.
  • bindconf: two imports with the same last-segment binding require an alias.
  • pubpriv: a public signature cannot expose a private nominal type.
  • errnom: nominal error cannot flow into core.Error via try.

They are not registered in src/ferrolang_vm/registry.py yet. M8 should add procedural checks for .fei creation/hash invalidation and deterministic fe_errors.h using these fixtures.

The M8 DOS gate must additionally construct two separate -I roots containing the same canonical unit and require an ambiguity error; repeat the case with two paths to the same canonical file and require deduplication. It must also verify that std.* resolves only from the built-in std root, ordinary user units never do, and that changing a private non-generic implementation preserves the dependent interface-cache hit. Those checks need temporary roots/cache inspection and deliberately remain procedural rather than encoding host paths in fixtures.