error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
 --> ../../../rust/test/diagnostics/inc/cta_ptr_same_size_fail.rs:8:3
  |
8 |   cta_ptr_same_size!( &ins1, &ins2 );
  |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: source type: `i32` (32 bits)
  = note: target type: `Int` (16 bits)
  = note: this error originates in the macro `cta_ptr_same_size` (in Nightly builds, run with -Z macro-backtrace for more info)