D7796: rust-nodemap: input/output primitives

[kevincox (Kevin Cox)]

kevincox added a comment.


  Ah yes. So my test would be ineffective.
  
  The problem that IIUC padding is not guaranteed to be initialized, and in rust all values need to be initialized. So if you cast a type with padding to a `u8` it is undefined behaviour.
  
  So we would need a test that shows that the type is the same size as the sum of the contained `i32`s.

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To: gracinet, #hg-reviewers, kevincox
Cc: durin42, kevincox, mercurial-devel