vsapsai added inline comments.

================
Comment at: 
libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp:196
   test_ctor_under_alloc();
+  test_ctor_with_different_value_type();
 }
----------------
Quuxplusone wrote:
> I suggest that interesting test cases include "array of `int` to vector of 
> `unsigned int`" (trivial, but unimplemented in this patch) and "array of 
> `iostream*` to vector of `ostream*`" (non-trivial because each pointer must 
> be adjusted).
What is that supposed to test? My `float/int` test is to make sure we have 
`is_same<_RawSourceTp, _RawDestTp>::value` and don't try to `memcpy` unrelated 
types. I've chosen `float` and `int` because it is easier for a human to reason 
about them.

`int` and `unsigned int` are interested for testing for values that are outside 
of common range. But in this case you pay more attention to conversion between 
ints, not to the behaviour of the constructor. That's my interpretation but 
maybe I've missed some of your intentions.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D48342/new/

https://reviews.llvm.org/D48342



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