error: the function has a cyclomatic complexity of 3
  --> $DIR/cyclomatic_complexity_attr_used.rs:11:1
   |
11 |   fn kaboom() {  //~ ERROR: the function has a cyclomatic complexity of 3
   |  _^ starting here...
12 | |     if 42 == 43 {
13 | |         panic!();
14 | |     } else if "cake" == "lie" {
15 | |         println!("what?");
16 | |     }
17 | | }
   | |_^ ...ending here
   |
note: lint level defined here
  --> $DIR/cyclomatic_complexity_attr_used.rs:3:9
   |
3  | #![deny(cyclomatic_complexity)]
   |         ^^^^^^^^^^^^^^^^^^^^^
   = help: you could split it up into multiple smaller functions

error: aborting due to previous error