Parse Swift operators as link components for operators with symbol diacritics

[d-ronnqvist]

Bug/issue #, if applicable:

Summary

This fixes a very rare and unlikely bug where a Swift operator that contains both a symbol with a diacritic and a forward slash wouldn't parse as a symbol link correctly.

Dependencies

None.

Testing

Define a custom ☜⃩/ infix operator and link to it using ☜⃩/(_:_:). The link should resolve.

infix operator ☜⃩/ : DefaultPrecedence

/// This link should resolve ``☜⃩/(_:_:)``
public struct Something {
    public static func ☜⃩/ (lhs: Self, rhs: Self) -> Bool { 
        false
    }
}

Checklist

Make sure you check off the following items. If they cannot be completed, provide a reason.

• Added tests
• Ran the ./bin/test script and it succeeded
• Updated documentation if necessary Not applicable.

[d-ronnqvist]

@swift-ci please test

[patshaughnessy]

The code changes look good, and also the new table of unicode values inside of isValidSwiftOperatorCharacter.

But can you review the existing unicode values mentioned inside of isValidSwiftOperatorHead? The list looks different than what I see in the Operators discussion on docs.swift.org.

For example, docs.swift.org mentions:

operator-head → U+2190–U+23FF

...but I don't see those values in your existing code. Maybe we just need to update the code based on changes to Swift or the Swift docs?

[d-ronnqvist]

@swift-ci please test

This feedback has been addressed in ea05a92