Expression patterns can appear outside of switch case labels

[AnthonyLatsis]

Location

https://docs.swift.org/swift-book/documentation/the-swift-programming-language/patterns#Expression-Pattern

Description

Expression patterns appear only in switch statement case labels.

This is not true. Expression patterns may appear in both switch case items and case conditions. For example, if case 0 = i {} or while case .function(let name, numParams: 0) = node {}.

rdar://46341816