   Compiling my-app v0.1.0 (/home/user/my-app)
error[E0425]: cannot find value `foo` in this scope
  --> src/main.rs:10:9
   |
10 |     let x = foo;
   |         ^^^ not found in this scope

error[E0425]: cannot find value `bar` in this scope
  --> src/main.rs:20:9
   |
20 |     let y = bar;
   |         ^^^ not found in this scope

warning: unused variable `x`
  --> src/main.rs:15:5

error: could not compile `my-app` due to previous error
