Brummel
d5f63bc3e5
Lift 16b.1's no-capture restriction. The desugar pass's `scope` becomes a `BTreeMap<String, ScopeEntry>` carrying `KnownType` for fn/Lam-params, sentinels for Let-/Match-bindings. LetRec captures of `KnownType` names are lifted: the synthetic top-level fn's signature gets the capture types appended, and every call site of the LetRec name is rewritten via `subst_call_with_extras` to pass the captures positionally. Captures from let-bindings, match-arm patterns, polymorphic enclosing fns, and name-as-value uses are rejected at desugar with panics pointing at 16b.3-16b.7. Demo: `sum_below(n)` recurses via `(let-rec loop (params i) ... (body ... uses n ...) (in (app loop 1)))`. Lifts to `loop$lr_0(i: Int, n: Int) -> Int` with `(app loop X)` rewritten to `(app loop$lr_0 X n)`. Outputs 0, 10, 45. Tests: 103 -> 106 (+1 e2e local_rec_capture_demo, +2 desugar unit; the 16b.1 capture-panic test was repurposed into the positive fn-param-capture test). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2 lines
1.6 KiB
JSON
2 lines
1.6 KiB
JSON
{"defs":[{"body":{"body":{"cond":{"args":[{"name":"i","t":"var"},{"name":"n","t":"var"}],"fn":{"name":">=","t":"var"},"t":"app"},"else":{"args":[{"name":"i","t":"var"},{"args":[{"args":[{"name":"i","t":"var"},{"lit":{"kind":"int","value":1},"t":"lit"}],"fn":{"name":"+","t":"var"},"t":"app"}],"fn":{"name":"loop","t":"var"},"t":"app"}],"fn":{"name":"+","t":"var"},"t":"app"},"t":"if","then":{"lit":{"kind":"int","value":0},"t":"lit"}},"in":{"args":[{"lit":{"kind":"int","value":1},"t":"lit"}],"fn":{"name":"loop","t":"var"},"t":"app"},"name":"loop","params":["i"],"t":"letrec","type":{"effects":[],"k":"fn","params":[{"k":"con","name":"Int"}],"ret":{"k":"con","name":"Int"}}},"doc":"Sum 1 + 2 + ... + (n-1). Helper captures n from the enclosing scope.","kind":"fn","name":"sum_below","params":["n"],"type":{"effects":[],"k":"fn","params":[{"k":"con","name":"Int"}],"ret":{"k":"con","name":"Int"}}},{"body":{"lhs":{"args":[{"args":[{"lit":{"kind":"int","value":1},"t":"lit"}],"fn":{"name":"sum_below","t":"var"},"t":"app"}],"op":"io/print_int","t":"do"},"rhs":{"lhs":{"args":[{"args":[{"lit":{"kind":"int","value":5},"t":"lit"}],"fn":{"name":"sum_below","t":"var"},"t":"app"}],"op":"io/print_int","t":"do"},"rhs":{"args":[{"args":[{"lit":{"kind":"int","value":10},"t":"lit"}],"fn":{"name":"sum_below","t":"var"},"t":"app"}],"op":"io/print_int","t":"do"},"t":"seq"},"t":"seq"},"doc":"Drive sum_below at 1, 5, 10. Expected (per line): 0, 10, 45.","kind":"fn","name":"main","params":[],"type":{"effects":["IO"],"k":"fn","params":[],"ret":{"k":"con","name":"Unit"}}}],"imports":[],"name":"local_rec_capture","schema":"ailang/v0"}
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