v/cmd/tools/vdoc/testdata/run_examples_bad/main.v

// abc just prints 'xyz'. The important thing however is the next line, that does an assertion,
// that should FAIL to be executed with `v doc -run-examples good.v`:
// Example: assert 5 * 5 == 77
pub fn abc() {
	println('xyz')
}

fn main() {
	abc()
}