mem::uninitialized/zeroed regressions

• synattra-0.1.1 test passed build faulty deps

uninit panic running auto_enum derive macro (auto_enums v0.4.1)

• ackintosh test oom build ICE
  Looks like it's probably unrelated

rustc_codegen_ssa/src/traits/type_.rs:95:18: unexpected unsized tail

• typ-0.1.1 test failed build compiler error
  Looks unrelated

error[E0275]: overflow evaluating the requirement `UInt<UInt<UInt<UInt<UInt<UTerm, typenum::B1>, typenum::B0>, typenum::B0>, typenum::B1>

• Bravo555/simple-auth-server test passed build failed
  Seems like UB in crossbeam_queue, no unsafe in this repository

attempted to zero-initialize type crossbeam_queue::seg_queue::Block<job::JobRef>, which is invalid

• SerhoLiu/eakio test passed build failed
  Contains one unsafe which looks unrelated to the UB panics. Likely UB in coco, used by rayon_core 1.3.0

attempted to zero-initialize type [std::cell::UnsafeCell<(unsafe fn(*mut u8, usize), *mut u8, usize)>; 64], which is invalid
coco::epoch::garbage::Bag:

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:h543afd6da80860c1
epoch/garbage.rs:70:31

• badboy/signify-rs test passed build failed
  Likely UB in coco, used by rayon_core 1.3.0

attempted to zero-initialize type [std::cell::UnsafeCell<(unsafe fn(*mut u8, usize), *mut u8, usize)>; 64], which is invalid
coco::epoch::garbage::Bag:

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:h543afd6da80860c1
epoch/garbage.rs:70:31