Front end
Lexer, parser, semantic checks, and deterministic diagnostics.
Backend architecture
Compiler reliability before target expansion.
Native backend work should be gated by deterministic IR checks, platform smoke tests, and clear unsupported-target errors.
IR
Control flow, loads, stores, conversions, calls, and verifier coverage.
Native targets
x86_64 Windows and Linux are the primary hardening lanes.
Runtime
IO, networking, GUI, TLS, database, and experimental accelerators are separated by stability labels.