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Phase 4 cont. Adds runtime support for Go's slice type.
Slice representation: (list :go-slice ELEMS) — a simple wrapper around
a list of element values. v0 deferring the full
(length, capacity, backing-vector) triple from the Go spec until
programs need it.
go-eval-composite → for (:composite TYPE-OR-EXPR ELEMS) where
TYPE is :ty-slice / :ty-array, eval each
element (handling :kv index-keyed
shorthand by taking only the value) and
wrap in :go-slice.
go-eval-index → (:index OBJ IDX). Bounds-checked; out-of-
range returns (:eval-error :index-out-of-range).
go-eval-slice → (:slice OBJ LOW HIGH MAX). Two-index slice
with omitted low → 0, omitted high → len.
Returns a new :go-slice.
go-list-slice → primitive list-slicing helper.
Builtins live in a new starter env go-env-builtins:
len(slice|string) → count
append(slice, ...x) → new slice with x appended
print(...) → no-op in v0
Builtins are bound as (:go-builtin NAME); go-eval-call recognises the
shape and routes to go-eval-builtin instead of go-eval-fn.
**Summing a slice via the canonical Go for-loop works end-to-end:**
a := []int{1, 2, 3, 4, 5}
sum := 0
for i := 0; i < len(a); i++ {
sum = sum + a[i]
}
// sum == 15
eval 50/50, total 427/427.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
16 lines
322 B
Markdown
16 lines
322 B
Markdown
# Go-on-SX Scoreboard
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**Total: 427 / 427 tests passing**
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| | Suite | Pass | Total |
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|---|---|---|---|
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| ✅ | lex | 129 | 129 |
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| ✅ | parse | 176 | 176 |
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| ✅ | types | 72 | 72 |
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| ✅ | eval | 50 | 50 |
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| ⬜ | runtime | 0 | 0 |
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| ⬜ | stdlib | 0 | 0 |
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| ⬜ | e2e | 0 | 0 |
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Generated by `lib/go/conformance.sh`.
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