clippy 0.0.149

A bunch of helpful lints to avoid common pitfalls in Rust
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error: useless lint attribute
 --> $DIR/useless_attribute.rs:5:1
  |
5 | #[allow(dead_code)]
  | ^^^^^^^^^^^^^^^^^^^ help: if you just forgot a `!`, use: `#![allow(dead_code)]`
  |
  = note: `-D useless-attribute` implied by `-D warnings`

error: aborting due to previous error