error[E0277]: `main` has invalid return type `std::result::Result<f32, std::num::ParseFloatError>`
  --> $DIR/termination-trait-test-wrong-type.rs:7:1
   |
LL | / fn can_parse_zero_as_f32() -> Result<f32, ParseFloatError> {
LL | |     "0".parse()
LL | | }
   | |_^ `main` can only return types that implement `std::process::Termination`
   | 
  ::: $SRC_DIR/libtest/lib.rs:LL:COL
   |
LL |   pub fn assert_test_result<T: Termination>(result: T) {
   |                                ----------- required by this bound in `test::assert_test_result`
   |
   = help: the trait `std::process::Termination` is not implemented for `std::result::Result<f32, std::num::ParseFloatError>`

error: aborting due to previous error

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