Handle AnyRegexOutput when casting to new Regex (#468)

Author: Azoy

Sources/_StringProcessing/Utility/TypeVerification.swift

@@ -14,6 +14,10 @@
 @available(SwiftStdlib 5.7, *)
 extension Regex {
   internal func _verifyType() -> Bool {
+    guard Output.self != AnyRegexOutput.self else {
+      return true
+    }
+    
     var tupleElements: [Any.Type] = [Substring.self]
     var labels = " "
 

Tests/RegexBuilderTests/AnyRegexOutputTests.swift

@@ -138,8 +138,7 @@ extension RegexDSLTests {
     ) {
       let aro = Regex<AnyRegexOutput>(re)
 
-      // FIXME: The below fatal errors
-      let casted = aro//try! XCTUnwrap(Regex(aro, as: Output.self))
+      let casted = try! XCTUnwrap(Regex(aro, as: Output.self))
 
       // contains(captureNamed:)
       checkContains(re, kind)
@@ -173,15 +172,15 @@ extension RegexDSLTests {
       (?x)
       (\p{hexdigit}{4}) -? (?<salient>\p{hexdigit}{4}) -?
       (\p{hexdigit}{4}) -? (\p{hexdigit}{4})
-      """#, as: (Substring, Substring, Substring, Substring, Substring).self),
+      """#, as: (Substring, Substring, salient: Substring, Substring, Substring).self),
       .salient,
       salientOutput
     )
     check(try! Regex(#"""
       (?x)
       (\p{hexdigit}{4}) -? (?<note>\p{hexdigit}{4}) -?
       (\p{hexdigit}{4}) -? (\p{hexdigit}{4})
-      """#, as: (Substring, Substring, Substring, Substring, Substring).self),
+      """#, as: (Substring, Substring, note: Substring, Substring, Substring).self),
       .note,
       noteOutput
     )