error[E0423]: expected function, found macro `println`
 --> examples_tests/rustc_basic/hello.rs:2:5
  |
2 |     println("hello world")
  |     ^^^^^^^ not a function
  |
help: use `!` to invoke the macro
  |
2 |     println!("hello world")
  |            +

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0423`.