Fix _testDSLCaptures

Previously we would ignore the case where the
match fails, but the test expects the match to
succeed.

Author: hamishknight

Tests/RegexBuilderTests/RegexDSLTests.swift

@@ -270,10 +270,11 @@ class RegexDSLTests: XCTestCase {
         }
         .ignoresCase(false)
       }
-    
+
+    // FIXME: Re-enable this test
     try _testDSLCaptures(
       ("can't stop won't stop", ("can't stop won't stop", "can't", "won't")),
-      matchType: (Substring, Substring, Substring).self, ==) {
+      matchType: (Substring, Substring, Substring).self, ==, xfail: true) {
         Capture {
           OneOrMore(.word)
           Anchor.wordBoundary
@@ -289,10 +290,11 @@ class RegexDSLTests: XCTestCase {
         OneOrMore(.any, .reluctant)
         "stop"
       }
-    
+
+    // FIXME: Re-enable this test
     try _testDSLCaptures(
       ("can't stop won't stop", ("can't stop won't stop", "can", "won")),
-      matchType: (Substring, Substring, Substring).self, ==) {
+      matchType: (Substring, Substring, Substring).self, ==, xfail: true) {
         Capture {
           OneOrMore(.word)
           Anchor.wordBoundary