Linking Errors with Specific Optimization Levels When Running Test Cases about ahash

[tkaitchuck]

This is intentional. (And is a link error not a panic)

The tests are using the crate no-panic to assert that it is impossible for the hasher to cause a panic. This works by writing a test where a macro injects a call to a non-existent library inside of a panic catch block. Then if the optimizer is able to prove this code is unreachable it will be deleted and no link error will occur. For this to work the optimizer usually needs to be turned up to at least O2.