error: constant expression depends on a generic parameter
  --> $DIR/const-expr-generic-err2.rs:4:19
   |
LL |     let _ = [0u8; const { std::mem::size_of::<T>() }];
   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this may fail depending on what value the parameter takes

error: aborting due to previous error