directly call handle_alloc_error - #3480
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Also test more codepaths. There's like 5 different things that can happen on allocation failure! Between
-Zoom,#[alloc_error_handler], andset_alloc_error_hook, we have 3 layers of behavior overrides. It's all a bit messy.rust-lang/rust#112331 seems intended to clean this up, but has not yet reached consensus.