Project Zephyr — Implementation Plan

Completed Waves

Wave	Contents	Status
A	Flat Closure, Constant Folding, Write Barrier, int fast-path	✅
B	File splitting, stats CLI	✅
C	Bitmap Card Table, Lazy Sweep, Adaptive Nursery, String Concat	✅
D	NaN-boxing, Shape IC, Instruction Compression	✅
E1	f"..." interpolation, ?. chaining, ZephyrClassBinder, Profiler API	✅
E2	Pattern Matching expansion, Traits/impl, DAP server, VM Snapshot	✅
F	Superinstruction fusion, GC trace, module bytecode caching, PGO	✅
G	Diagnostic messages, stack traces, corpus tests, separate test files	✅
H	String interning, std/math/string/collections, package.toml, CMake	✅
H.0	Register VM (R_* opcodes, RegisterAllocator, coroutine integration)	✅
K	Generic type parameters	✅
L	Result<T>, ? operator, enhanced patterns	✅
M	Module system (named imports, re-exports)	✅
N	Lowercase primitive types (int/float/bool/string/void/any)	✅
O	2-pass semacheck (hoisting, trait impl completeness)	✅
P	String interning + trait where clauses	✅
Q	std/json + std/collections	✅
R	Associated functions (TypeName::fn)	✅
S	Error messages + iterator protocol	✅
T	std/io, std/gc, std/profiler, --profile CLI	✅
Spill	R_SPILL_LOAD/STORE, >256 locals, format v2	✅

Post-Wave Improvements (2026-03-30)

Task	Status
CMake migration complete (bench/sample/dap targets)	✅
LSP v0.2.0 (signatureHelp, rename, workspace/symbol, hover type inference)	✅
.inl → .cpp conversion (5 files, independent TUs)	✅
Eliminate all build warnings (/utf-8, C4458 fix)	✅
Remove unnecessary docs (63 files including copilot_scripts)	✅
Remove empty zephyr_gc.cpp file	✅

Next Tasks

#	Task	Priority
1	AOT compilation (LLVM/QBE backend)	Medium
2	LSP inlay hints	Low
3	Package manager (fetch/lock)	Medium
4	std/net, std/async	Low
5	Enhanced REPL	Low