Fuzz targets (cargo +nightly fuzz):
- fuzz_lexer: lexer must never panic on arbitrary input
- fuzz_parser: parser must never panic on arbitrary input
- fuzz_compile: full pipeline (parse → analyze → IR → optimize →
codegen → assemble → link) must never panic
Results: 3.3M iterations across all targets, zero crashes.
Seed corpus from all 7 examples + crafted edge cases.
11 new parser edge case tests:
- draw_followed_by_statement: regression for keyword-arg lookahead bug
- draw_with_frame_followed_by_statement: same with frame: arg
- nested_if_else_chain: 3-deep else-if chain
- deeply_nested_blocks: 4-deep nested if blocks
- empty_function_body: fun noop() {}
- empty_state_handlers: on enter/exit/frame {}
- button_start_in_condition: "start" keyword as button name
- button_select_in_condition: "select" keyword as button name
- multiple_draws_in_sequence: 3 draws followed by assignment
- parser_no_panic_on_garbage: 25 malformed inputs
- lexer_no_panic_on_garbage: 10 malformed inputs
221 tests total, all pre-commit checks pass.
https://claude.ai/code/session_01W6eQFStA66EuMKHUFo2rx3
README: project overview, quick start, feature list, example table
LICENSE: MIT
4 new examples covering all language features:
- arrays_and_functions: arrays, while loops, inline/regular functions
- state_machine: multi-state flow with on enter/exit handlers
- sprites_and_palettes: inline CHR data, palette switching, scroll, cast
- mmc1_banked: MMC1 mapper, bank declarations, software multiply
Parser fix: draw statement keyword-arg parsing now checks for ':'
lookahead before consuming an identifier, preventing it from eating
the next statement as a keyword argument (e.g., `i += 1` after a draw).
https://claude.ai/code/session_01W6eQFStA66EuMKHUFo2rx3
Pipeline:
- main.rs now runs IR lowering and optimization before codegen
- IR is built and optimized but output still uses AST-based codegen
(IR-based codegen is a future improvement)
Coin Cavern example (examples/coin_cavern.ne):
- 3-state game: Title → Playing → GameOver
- Functions (clamp_x), constants, gravity physics, coin collection
- Demonstrates most M2 language features
Integration tests (14 total, 7 new):
- program_with_functions: functions with params and return values
- program_with_while_loop: while loops compile correctly
- program_with_fast_slow_vars: placement hints accepted
- program_with_multi_state_transitions: 3-state cycle
- coin_cavern_compiles: full Coin Cavern example
- ir_pipeline_produces_ir: validates IR lowering + optimizer
- error_test_recursion_detected: E0402 for recursive functions
https://claude.ai/code/session_01W6eQFStA66EuMKHUFo2rx3
Analyzer extensions:
- Call graph construction from function bodies and state handlers
- DFS-based recursion detection (direct and mutual) with E0402 errors
- Max call depth computation per entry point with E0401 enforcement
- Function declarations registered as symbols (E0503 for undefined calls)
- Collects calls from all statement/expression types recursively
Optimizer (new module):
- Constant folding: evaluate known-constant arithmetic at compile time
- Dead code elimination: remove ops with unused destination temps
- Both operate per-basic-block in a single pass
171 tests total (22 new: 6 analyzer + 11 IR lowering + 5 optimizer)
https://claude.ai/code/session_01W6eQFStA66EuMKHUFo2rx3
- CI: new "Build Examples" job compiles all .ne files and validates
the output ROMs have correct iNES headers
- Examples: add notes explaining that sprite names (Smiley, Ball) are
parsed but not yet resolved — all draws use the built-in CHR tile 0.
Custom sprite declarations come in M3.
- Codegen: explicit `let _ = &draw.sprite_name` to document the
intentional skip, with comment about M2/M3 scope
https://claude.ai/code/session_01W6eQFStA66EuMKHUFo2rx3
Two example .ne programs with compiled .nes ROMs:
- hello_sprite: d-pad controlled sprite movement
- bouncing_ball: auto-bouncing sprite with edge detection
Includes README with build instructions and emulator setup.
https://claude.ai/code/session_01W6eQFStA66EuMKHUFo2rx3
