Incorrect Result return type in test incorrectly mentions main

[estebank]

When having an incorrect return type in a #[test], do not complain about main:

rust/src/test/ui/rfc-1937-termination-trait/termination-trait-test-wrong-type.stderr

Lines 1 to 10 in c21fbfe

	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`