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Document mirror desync at infer_method_args_with_fold (DESIGN §4c) #8613

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Document mirror desync at infer_method_args_with_fold (DESIGN §4c) #8613

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7 changes: 7 additions & 0 deletions src/v1/04_infer.dag
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Original file line number Diff line number Diff line change
Expand Up @@ -3090,6 +3090,13 @@ fn derive_element_provenance(coll_expr: Node, elem_type: Node, scope: InferScope
}
}

// MIRROR DESYNC, measured 2026-08-20 against origin/main 9b29509e5c9: the committed stage0
// projection (src/v1/stage0/src/v1_compiler_infer.rs::infer_method_args_with_fold) has 6
// parameters, missing this signature's 7th, `arg_contract: DeclaredArgContract` (dag:
// arg_contract x5, mirror: x0), and the mirror body still calls
// scalar_shaped_builtin_method_arg_type, an identifier absent from this authority (dag: x0,
// mirror: x2). `claim_executor --required-regen` at that same commit reported the two-file
// required-regen population mismatch but did not flag this fn as generated-surface drift.
fn infer_method_args_with_fold(method_name: String?, method_args: List<Node>, fold_info: ArgInferResult?, fold_acc_type: Node, element_type: Node, elem_provenance: SubValueRelation, arg_contract: DeclaredArgContract, scope: InferScope) -> List<ArgInferResult> {
let is_fold = method_name_is(opt: method_name, expected: "fold")
method_args |> enumerate |> map(idx_pair =>
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