Fix compiler crash

Author: Kyle-Ye

Sources/OpenGraphShims/Attribute+Debug.swift

@@ -2,6 +2,8 @@
 //  Attribute+Debug.swift
 //  OpenGraphShims
 
+#if canImport(Darwin) && DEBUG // Compiler crash for Darwin + release and non-Darwin build
+
 // Use 4 spaces instead of \t for bettern test case expect
 private let tab = "    "
 
@@ -85,4 +87,5 @@ extension AnyAttribute: Swift.CustomDebugStringConvertible {
 
         return "\(nextTabs)\(bodyValueString)"
     }
-}
+}
+#endif

Tests/OpenGraphShimsTests/Attribute+DebugTests.swift

@@ -2,6 +2,8 @@
 //  Attribute+DebugTests.swift
 //  OpenGraphShimsTests
 
+#if canImport(Darwin) && DEBUG
+
 import Testing
 import OpenGraphShims
 
@@ -48,3 +50,4 @@ struct Attribute_DebugTests {
         """#)
     }
 }
+#endif