clippy 0.0.157

A bunch of helpful lints to avoid common pitfalls in Rust
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error: This expression evaluates to the Unit type ()
  --> $DIR/is_unit_expr.rs:8:13
   |
8  |       let x = {
   |  _____________^
9  | |         "foo";
10 | |         "baz";
11 | |     };
   | |_____^
   |
   = note: `-D unit-expr` implied by `-D warnings`
note: Consider removing the trailing semicolon
  --> $DIR/is_unit_expr.rs:10:9
   |
10 |         "baz";
   |         ^^^^^^

error: This expression evaluates to the Unit type ()
  --> $DIR/is_unit_expr.rs:22:13
   |
22 |       let z = if true {
   |  _____________^
23 | |         "foo";
24 | |     } else {
25 | |         "bar";
26 | |     };
   | |_____^
   |
note: Consider removing the trailing semicolon
  --> $DIR/is_unit_expr.rs:25:9
   |
25 |         "bar";
   |         ^^^^^^

error: This expression evaluates to the Unit type ()
  --> $DIR/is_unit_expr.rs:40:14
   |
40 |       let a3 = match a1 {
   |  ______________^
41 | |         Some(x) => {
42 | |             x;
43 | |         },
...  |
46 | |         },
47 | |     };
   | |_____^
   |
note: Consider removing the trailing semicolon
  --> $DIR/is_unit_expr.rs:42:13
   |
42 |             x;
   |             ^^

error: aborting due to 3 previous errors