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    "result": "This postcondition quantifies universally over two independently selected sets of operations drawn from `output.operations`, so it inspects the subject's output program at every nesting depth and never consults `input`. The first selection, `definitions`, is every operation whose name is exactly `\"dataflow.thread\"` or `\"dataflow.graph\"`; the second, `symbol_users`, is every operation that carries an attribute or property keyed `\"callee\"`, regardless of that attribute's kind or the operation's name or dialect. For each member of `definitions` it accepts only operations that have a parent operation whose name is `\"builtin.module\"` (a root module with no parent fails the match, and a definition nested inside anything else fails), that have a key `\"sym_name\"` present in their attribute map, and that have a key `\"function_type\"` present whose attribute projects to a type with `kind == \"function\"`; a `\"function_type\"` attribute that is not type-valued produces an evaluation error rather than a clean rejection. For each member of `symbol_users` it resolves the `\"callee\"` attribute against the output program and rejects the program if any resolved target operation is named `\"dataflow.thread\"` while the using operation is not named `\"dataflow.thread.launch\"`, or is named `\"dataflow.graph\"` while the user is not named `\"dataflow.graph.launch\"`; resolved targets with any other name are unconstrained, and users are otherwise free to be any operation. The only value sources are operation names, the `parent_operation` option, attribute-key presence, the `function_type` attribute's type kind, and the result sequence of `mlir::resolve_symbol_reference` over the same output program \u2014 no operands, results, regions, blocks, types of values, segments, or counts are read. Both `forall` blocks are vacuously satisfied when their selections are empty: an output with no `dataflow.thread` or `dataflow.graph` operations imposes no structural requirements, and an output with no `\"callee\"`-bearing operations imposes no launch requirement. The launch assertion is also vacuously true for any user whose `\"callee\"` resolves to an empty sequence of targets, since `none` over an empty sequence holds. Non-vacuous behavior therefore requires at least one thread or graph operation present, or at least one `\"callee\"` user that resolves to at least one thread or graph definition.",
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