fix(stdlib): Iterator collect uses list not nonexistent Vec (#135 slice 4-traits)#169
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…e 4-traits)
traits.affine:124 was the last parse blocker. Root cause is NOT a
compiler grammar gap: `while let` already parses. It is broken stdlib
code — `Iterator::collect` returned `Vec[Item]` and used `Vec::new()` /
`.push()`, but **`Vec` is not defined anywhere in the stdlib** (the
whole stdlib builds lists with `[]` + `++`, never `Vec`; `Vec::new()`
also exercised an unsupported `Type::lower_fn()` associated-call form).
Resolve-at-source: rewrite `collect` in the stdlib's own list idiom
(`let mut result = []; while let Some(item) = self.next() { result =
result ++ [item]; } return result`) rather than add speculative `Vec`
+ associated-function grammar to prop up code that never had a `Vec`.
Effect: traits.affine clears its last parse wall (PARSE 124 ->
TYPECHECK; the remaining `ref 't ~ Int` is a distinct deeper defect in
the `impl Eq for Int` blocks). Pure stdlib change — suite unaffected.
Advances #135. Refs #128, #135.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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traits.affine:124 was the last parse blocker. Not a compiler gap —
while letalready parses. Broken stdlib code:Iterator::collectreturnedVec[Item]/ usedVec::new()/.push()but Vec is not defined anywhere in the stdlib (it uses[]+++everywhere else). Rewrotecollectin the stdlib's own list idiom instead of adding speculative Vec + associated-fn grammar. traits.affine PARSE 124 -> TYPECHECK (remaining ref-vs-Int is a distinct deeper defect). Pure stdlib, suite unaffected. Refs #128, #135.🤖 Generated with Claude Code