`entries.map((entry) => async () => …)` (package-manager's concurrency task
lists, `(() => Promise<…>)[]`) was refused: `.map` rejected a `func` return
with the same badType as a `void` return.
A closure is a supported array element. The closure array literal `[() => 1]`
already lowers to a `func`-element array, where the value is one ScrClosure
for its whole life, stored by reference with the element kind's `_v` adapter
and `scr_closure_trace_v`. The map helper builds the same array, so the
`func` half of the fence goes at both `.map` sites (plain receiver and
union-of-arrays receiver).
The `void` fence stays: `void[]` has no element, because a void return value
is erased before it could be written.
Corpus 8415-map-closure-elements pins the `.map`-produced arrays of closures:
`Array<() => Promise<string>>` and `Array<() => string>`, closure identity
through `indexOf`/`includes`, an inline `.map`, and
`Promise.all(tasks.map((task) => task()))`.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Chris Tate