[NLL] issue-29844.rs test overflows while adding drop-check rules

[spastorino]

$ RUST_BACKTRACE=full rustc +stage1 src/test/run-pass/issue-29844.rs -Znll -Zborrowck=mir -Ztwo-phase-borrows
error[E0320]: overflow while adding drop-check rules for std::vec::Vec<AttachInfo<'_, Resources>>
  |
  = note: overflowed on DescriptorSet<'_>

error[E0320]: overflow while adding drop-check rules for std::vec::Vec<AttachInfo<'_, Resources>>
  |
  = note: overflowed on *const alloc::arc::ArcInner<DescriptorSet<'_>>

error[E0320]: overflow while adding drop-check rules for DescriptorSet<'_>
  |
  = note: overflowed on DescriptorSet<'_>

error[E0320]: overflow while adding drop-check rules for DescriptorSet<'_>
  |
  = note: overflowed on *const alloc::arc::ArcInner<DescriptorSet<'_>>

error: aborting due to 4 previous errors

[Aaron1011]

I'd like to work on this.

[Aaron1011]

@nikomatsakis: This appears to be a regular error, not an ICE.