error[E0277]: `main` has invalid return type `std::result::Result<f32, std::num::ParseIntError>`
  --> $DIR/termination-trait-test-wrong-type.rs:6:1
   |
LL | / fn can_parse_zero_as_f32() -> Result<f32, ParseIntError> {
LL | |     "0".parse()
LL | | }
   | |_^ `main` can only return types that implement `std::process::Termination`
   |
   = help: the trait `std::process::Termination` is not implemented for `std::result::Result<f32, std::num::ParseIntError>`
   = note: required by `test::assert_test_result`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.