A small platformer scaffold that exercises every recent language
feature in one place:
- \`struct Player { ... }\` with u8 and bool fields
- \`enum Direction { Up, Down, Left, Right }\`
- \`enum AnimFrame { Idle, Run1, Run2 }\`
- \`for i in 0..4 { ... }\` looping over a fixed-size array
- Struct field assignment and reads
- Enum variant assignment
Compiles through the default IR codegen and links cleanly.
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
- 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
