closure_indirect_dispatch.affine

// SPDX-License-Identifier: PMPL-1.0-or-later
// issue #235 — the #199 closure-pointer ABI exercised in a real wasm
// engine INDEPENDENT of the async / CPS transform.
//
// Until #225 PR2 the #199 ABI ([fnId@0,envPtr@4] dispatched via the
// exported __indirect_function_table) had only ever been STATICALLY
// compiled across the estate — the two defects PR2 found had hidden in
// that blind spot. The async tests now exercise it, but only *through*
// the CPS transform. tests/codegen/test_closure_capture.affine (and
// the other test_closure_*.affine) have NO `.mjs` host — they are
// compile-only. This fixture closes that gap: a captured-closure
// callback handed to a plain `extern fn`, dispatched by the host via
// __indirect_function_table, with NO `thenableThen` / Async effect, so
// the async transform is provably not involved.

extern fn invokeCallback(cb: fn(Unit) -> Int) -> Int;

pub fn launch() -> Int {
  let base = 7;
  invokeCallback(fn(u: Unit) => base + 35)   // host-dispatched -> 42
}