Auto merge of #159516 - JonathanBrouwer:rollup-XY9SezB, r=JonathanBrouwer Rollup of 8 pull requests Successful merges: - rust-lang/rust#159425 (Windows: add context when opening NUL for child stdio fails) - rust-lang/rust#159467 (Add explicit `Iterator::count` impl for `str::EncodeUtf16`) - rust-lang/rust#157860 (Move rustdoc run-make tests into new `tests/run-make/rustdoc/`) - rust-lang/rust#158545 (Move `std::io::read_to_string` to `alloc::io`) - rust-lang/rust#159328 (tests/assembly-llvm: pin frame pointer in issue-141649 aarch64 test) - rust-lang/rust#159459 (Detect when trait bound requires closure to return itself) - rust-lang/rust#159470 (Fix string indexing in diagnostic format strings) - rust-lang/rust#159500 (Move compiletest CLI parsing to `cli.rs`)
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