clippy 0.0.208

A bunch of helpful lints to avoid common pitfalls in Rust
error: transmute from a `f64` to a pointer
 --> $DIR/transmute_64bit.rs:9:31
  |
9 |         let _: *const usize = std::mem::transmute(6.0f64);
  |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `-D wrong-transmute` implied by `-D warnings`

error: transmute from a `f64` to a pointer
  --> $DIR/transmute_64bit.rs:11:29
   |
11 |         let _: *mut usize = std::mem::transmute(6.0f64);
   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors