Conflict with other macro package

[Kyle-Ye]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Describe the bug

We are some existing package dependency(eg. swift-testing and swift-power-assert) which has a dependency on swift-syntax.

eg. .from("509.0.0") .from("510.0.1")

But the latest version of SwiftLint has a exact version dependency on "swift-syntax".

eg. SwiftLint 0.54.0 has a exact "509.0.2"

SwiftLint/Package.swift

Line 19 in f17a4f9

.package(url: "https://github.com/apple/swift-syntax.git", exact: "509.0.2"),

This will cause a package resolution failing due to conflicting requirement.

Solution

Use more flexible requirement of "from" and adapt the diff API internally so that both swift-syntax 509 and 510 will work here.

(eg. #if canImport(SwiftSyntax509) and #if canImport(SwiftSyntax510))

https://github.com/apple/swift-syntax/blob/728e2f6d5f9fd4a8e45eab6e52e86ad1519a7e2a/Sources/SwiftSyntax/Documentation.docc/Macro%20Versioning.md?plain=1#L9-L33

[Kyle-Ye]

There is a blog post explaining the detail here.

https://www.pointfree.co/blog/posts/116-being-a-good-citizen-in-the-land-of-swiftsyntax