message: Replace an unimplemented! with a bug!
diff: @@ -676,7 +676,7 @@ fn codegen_intrinsic_call<'a, 'tcx: 'a>(
  fx.bcx.ins().imul_imm(len, elem_size as i64)
  }
  ty::Dynamic(..) => crate::vtable::size_of_obj(fx, args[0]),
  - ty => unimplemented!("size_of_val for {:?}", ty),
  + ty => bug!("size_of_val for unknown unsized type {:?}", ty),
  };
  ret.write_cvalue(fx, CValue::ByVal(size, usize_layout));
  }
  