feat: capability system Layers 1-4 — effect signatures, fine-grained capabilities, affine types, effect handlers#130
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Implements all 4 layers of the capability system design (issue vercel-labs#84): - Layer 1: Effect signatures (raises<io, fs, net>) - Layer 2: Fine-grained capabilities (world.fs(), world.net(), etc.) - Layer 3: Affine capabilities (no duplication, CAP001 diagnostic) - Layer 4: Effect handlers (effect decl + with handledBy expr) Plus declaration-based capabilities for extensibility. Rebased cleanly on v0.1.3 (origin/main).
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Summary
Implements all 4 layers of the capability system design (issue #84), rebased cleanly on latest main (v0.1.3 + TypeScript migration).
Layer 1 — Effect Signatures:
raises<io, fs, net>syntax for static effect information.Layer 2 — Fine-Grained Capabilities:
world.fs(),world.net(), etc. derive capability types from World. Removed ambient authority (std.fs.host(),std.net.host()).Layer 3 — Affine Capabilities: Capability types are affine — no duplication, no global storage. CAP001 diagnostic.
Layer 4 — Effect Handlers:
effect Http { fun fetch(...) -> T }declarations andwith Http handledBy { ... }handler expressions. EFF001 diagnostic.Elegance Improvements:
capability Fs,capability Net, etc.)type_is_capability()z_free_program()Changes
40 files changed across compiler (zero.h, checker.c, ir.c, main.c, parser.c, lexer.c), conformance tests, examples, docs, and scripts.
Testing
world.fs()instead ofstd.fs.host()Replaces
This PR replaces the previous separate PRs (#86, #90, #94, #99, #117) which had merge conflicts.