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$ cargo build
   Compiling libc v0.2.86
   Compiling getrandom v0.2.2
   Compiling cfg-if v1.0.0
   Compiling ppv-lite86 v0.2.10
   Compiling rand_core v0.6.2
   Compiling rand_chacha v0.3.0
   Compiling rand v0.8.3
   Compiling guessing_game v0.1.0 (file:///projects/guessing_game)
error[E0308]: mismatched types
  --> src/main.rs:22:21
   |
22 |     match guess.cmp(&secret_number) {
   |                     ^^^^^^^^^^^^^^ expected struct `String`, found integer
   |
   = note: expected reference `&String`
              found reference `&{integer}`

For more information about this error, try `rustc --explain E0308`.
error: could not compile `guessing_game` due to previous error