Macro hex 

macro_rules! hex {
    ($hex:expr) => { ... };
}

Parses hex strings in const contexts.

This is primarily useful for testing, panics on all error paths.

Returns

[u8; N] array containing the parsed data if valid.

Panics

Panics on all error paths:

• If input string is not even length.
• If input string contains non-hex characters.