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lang: require ':' before a for-loop range cursor

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The cursor clause now matches the collection form's ': (capture)' — 'for 0..N: (i)' instead of 'for 0..N (i)'. The colon is required when a cursor is present; the no-cursor form 'for 0..N { }' is unchanged. Updated examples/200, the pack-index doc comment, and the spec.
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agra
2026-05-31 10:57:21 +03:00
parent c08433b345
commit 6b5edc77b4
4 changed files with 17 additions and 12 deletions
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10
specs.md
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@@ -1540,15 +1540,17 @@ while i < 10 {
#### Range form
```sx
for start..end (i) { } // counting loop, cursor `i` (s64), `end` exclusive
for start..end: (i) { } // counting loop, cursor `i` (s64), `end` exclusive
for start..end { } // no cursor — body runs `end - start` times
inline for start..end (i) { } // comptime-unrolled; `i` is a comptime constant per iteration
inline for start..end: (i) { } // comptime-unrolled; `i` is a comptime constant per iteration
```
`start` and `end` are `s64` expressions; the loop counts `start, start+1, …, end-1`.
The cursor parens are optional — omit them when the body doesn't need the index.
The cursor is optional — omit `: (i)` entirely when the body doesn't need the index
(`for 0..n { … }`). When present it is introduced by `:`, matching the collection
form (`for xs: (x)`).
The `inline` variant requires comptime-known bounds and unrolls the body once per
value, binding the cursor as a compile-time constant (so it can index a pack:
`inline for 0..xs.len (i) { xs[i].m() }`). `break;` / `continue;` work in the
`inline for 0..xs.len: (i) { xs[i].m() }`). `break;` / `continue;` work in the
runtime form.
#### Collection form