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Brummel 8b7e683cc9 experiment(cma): SMA probe run 3 — full grammar+spec+lib makes Qwen degenerate (refs #68 )

Third run of the SMA authoring probe, this time with Qwen fully equipped: a
distilled complete Form-A construct grammar (with explicit arity/paren rules),
the mini-spec, and the verbatim Series library source. Hypothesis: the formal
grammar clears the bracket failures of runs 1-2. It did the opposite.

With ~80k prompt tokens the model degenerated into an identical pathological
(seq (seq (seq ...))) tower every turn (321 open parens vs 10 close,
byte-identical across all 6 turns, indentation exploding). Doubling max_tokens
to confirm it was not mere truncation produced HTTP 413 (request too large) —
more budget yields an even larger degenerate output, confirming degeneration.

Verdict (n=1 model): Qwen3-Coder-Next wrote no working SMA in any of three
configurations; more reference material made it WORSE, not better (the lean
run 2 got the algorithm right, the fully-equipped run 3 looped); it never
converged from ail-check feedback in any run; all failures are Form-A
bracket-shape errors, never semantics. Driver + raw logs updated.

2026-06-02 17:49:23 +02:00

578 KiB

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SMA authoring probe — Qwen3-Coder-Next via IONOS

Model: Qwen/Qwen3-Coder-Next
Max turns: 6
Task: write the Series SMA worked example in AILang Form-A, given the Form-A mini-spec + Series API only (not the reference).

Expected stdout: '3.0\n5.33333\n5.66667\n5.33333\n'

Turn 1 — `check` ❌

Tokens this turn: prompt=8060, completion=2000

(module sma
  (fn main
    (doc "Compute a 3-point simple moving average over a stream of 6 floats, printing the average after each push once the window is full.")
    (type (fn-type (params) (ret (own (con Unit))) (effects IO)))
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ail check feedback:

error: [surface-parse-error] parse error: unexpected end of input, expected term

Turn 2 — `check` ❌

Tokens this turn: prompt=10111, completion=2000

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ail check feedback:

error: [surface-parse-error] parse error: unexpected end of input, expected term

Turn 3 — `check` ❌

Tokens this turn: prompt=12162, completion=2000

(module sma
  (fn main
    (doc "Compute a 3-point simple moving average over a stream of 6 floats, printing the average after each push once the window is full.")
    (type (fn-type (params) (ret (own (con Unit))) (effects IO)))
    (params)
    (body
      (let s (app Series/new 3)
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ail check feedback:

error: [surface-parse-error] parse error: unexpected end of input, expected term

Turn 4 — `check` ❌

Tokens this turn: prompt=14213, completion=2000

(module sma
  (fn main
    (doc "Compute a 3-point simple moving average over a stream of 6 floats, printing the average after each push once the window is full.")
    (type (fn-type (params) (ret (own (con Unit))) (effects IO)))
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ail check feedback:

error: [surface-parse-error] parse error: unexpected end of input, expected term

Turn 5 — `check` ❌

Tokens this turn: prompt=16264, completion=2000

(module sma
  (fn main
    (doc "Compute a 3-point simple moving average over a stream of 6 floats, printing the average after each push once the window is full.")
    (type (fn-type (params) (ret (own (con Unit))) (effects IO)))
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ail check feedback:

error: [surface-parse-error] parse error: unexpected end of input, expected term

Turn 6 — `check` ❌

Tokens this turn: prompt=18315, completion=2000

(module sma
  (fn main
    (doc "Compute a 3-point simple moving average over a stream of 6 floats, printing the average after each push once the window is full.")
    (type (fn-type (params) (ret (own (con Unit))) (effects IO)))
    (params)
    (body
      (let s (app Series/new 3)
        (seq
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error: [surface-parse-error] parse error: unexpected end of input, expected term

Outcome: did NOT reach green after 6 turn(s).
Total tokens: prompt=79125, completion=12000.

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