How to use `&` in match expression?

Question

In Symbol and Operator Reference, the symbol & is used for:

Links: Match Expressions

• Computes the address of a mutable value, for use when interoperating with other languages.

• Used in AND patterns.

I've looked at the Match Expressions page but I didn't see any AND patterns. How can I use the & patterns?

Answer 1

The and pattern syntax looks like the following:

(a, b) & (_, "test")

It is documented here.