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error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
  --> tests/ui-nightly/transmute-ref-size-increase.rs:17:33
   |
17 | const INCREASE_SIZE: &[u8; 2] = transmute_ref!(&0u8);
   |                                 ^^^^^^^^^^^^^^^^^^^^
   |
   = note: source type: `u8` (8 bits)
   = note: target type: `[u8; 2]` (16 bits)
   = note: this error originates in the macro `$crate::assert_size_eq` which comes from the expansion of the macro `transmute_ref` (in Nightly builds, run with -Z macro-backtrace for more info)