test availability

Author: Azoy

Tests/RegexTests/MatchTests.swift

@@ -797,19 +797,21 @@ extension RegexTests {
     firstMatchTest(#"\p{Assigned}"#, input: "123abcXYZ", match: "1")
     firstMatchTest(#"\p{ascii}"#, input: "123abcXYZ", match: "1")
     firstMatchTest(#"\p{isAny}"#, input: "123abcXYZ", match: "1")
-
-    firstMatchTest(#"\p{sc=grek}"#, input: "123αβγxyz", match: "α")
-    firstMatchTest(#"\p{sc=isGreek}"#, input: "123αβγxyz", match: "α")
-    firstMatchTest(#"\p{Greek}"#, input: "123αβγxyz", match: "α")
-    firstMatchTest(#"\p{isGreek}"#, input: "123αβγxyz", match: "α")
-    firstMatchTest(#"\P{Script=Latn}"#, input: "abcαβγxyz", match: "α")
-    firstMatchTest(#"\p{script=Greek}"#, input: "123αβγxyz", match: "α")
-    firstMatchTest(#"\p{ISscript=isGreek}"#, input: "123αβγxyz", match: "α")
-    firstMatchTest(#"\p{scx=bamum}"#, input: "123ꚠꚡꚢxyz", match: "ꚠ")
-    firstMatchTest(#"\p{ISBAMUM}"#, input: "123ꚠꚡꚢxyz", match: "ꚠ")
-    firstMatchTest(#"\p{Script=Unknown}"#, input: "\u{10FFFF}", match: "\u{10FFFF}")
-    firstMatchTest(#"\p{scx=Gujr}"#, input: "\u{a839}", match: "\u{a839}")
-    firstMatchTest(#"\p{Gujr}"#, input: "\u{a839}", match: "\u{a839}")
+    
+    if #available(SwiftStdlib 5.7, *) {
+      firstMatchTest(#"\p{sc=grek}"#, input: "123αβγxyz", match: "α")
+      firstMatchTest(#"\p{sc=isGreek}"#, input: "123αβγxyz", match: "α")
+      firstMatchTest(#"\p{Greek}"#, input: "123αβγxyz", match: "α")
+      firstMatchTest(#"\p{isGreek}"#, input: "123αβγxyz", match: "α")
+      firstMatchTest(#"\P{Script=Latn}"#, input: "abcαβγxyz", match: "α")
+      firstMatchTest(#"\p{script=Greek}"#, input: "123αβγxyz", match: "α")
+      firstMatchTest(#"\p{ISscript=isGreek}"#, input: "123αβγxyz", match: "α")
+      firstMatchTest(#"\p{scx=bamum}"#, input: "123ꚠꚡꚢxyz", match: "ꚠ")
+      firstMatchTest(#"\p{ISBAMUM}"#, input: "123ꚠꚡꚢxyz", match: "ꚠ")
+      firstMatchTest(#"\p{Script=Unknown}"#, input: "\u{10FFFF}", match: "\u{10FFFF}")
+      firstMatchTest(#"\p{scx=Gujr}"#, input: "\u{a839}", match: "\u{a839}")
+      firstMatchTest(#"\p{Gujr}"#, input: "\u{a839}", match: "\u{a839}")
+    }
 
     firstMatchTest(#"\p{alpha}"#, input: "123abcXYZ", match: "a")
     firstMatchTest(#"\P{alpha}"#, input: "123abcXYZ", match: "1")