cmse: test returning MaybeUninit<T>#155522
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The `MaybeUninit` type is `repr(transparent)`, so returning a `MaybeUninit<u64>` should work. The same is not true when using C or rust union types.
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Rollup merge of #155522 - folkertdev:cmse-test-maybe-uninit, r=WaffleLapkin cmse: test returning `MaybeUninit<T>` tracking issue: #81391 tracking issue: #75835 Some tests from #147697 that already work and are useful. Extracting them shrinks that (currently blocked) PR. The code in `tests/ui/cmse-nonsecure/cmse-nonsecure-call/return-via-stack.rs` checks that `MaybeUninit<T>` is considered abi-compatible with `T`. The code in `tests/ui/cmse-nonsecure/cmse-nonsecure-entry/params-via-stack.rs` really only tests that no errors/warnings are emitted. r? davidtwco
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tracking issue: #81391
tracking issue: #75835
Some tests from #147697 that already work and are useful. Extracting them shrinks that (currently blocked) PR.
The code in
tests/ui/cmse-nonsecure/cmse-nonsecure-call/return-via-stack.rschecks thatMaybeUninit<T>is considered abi-compatible withT. The code intests/ui/cmse-nonsecure/cmse-nonsecure-entry/params-via-stack.rsreally only tests that no errors/warnings are emitted.r? davidtwco