clippy 0.0.208

A bunch of helpful lints to avoid common pitfalls in Rust
error: assignment to temporary
  --> $DIR/temporary_assignment.rs:29:5
   |
29 |     Struct { field: 0 }.field = 1;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D temporary-assignment` implied by `-D warnings`

error: assignment to temporary
  --> $DIR/temporary_assignment.rs:30:5
   |
30 |     (0, 0).0 = 1;
   |     ^^^^^^^^^^^^

error: aborting due to 2 previous errors