[Parse][SR-702] Disallow attributes before #if

test/Parse/ConditionalCompilation/decl_parse_errors.swift

@@ -1,5 +1,19 @@
 // RUN: %target-parse-verify-swift
 
+public
+#if FOO // expected-error {{expected declaration}}
+var val1: Int = 0
+#else
+var val1: UInt = 1
+#endif
+
+struct S2 { // expected-note {{in declaration of 'S2'}}
+  @available(*, deprecated)
+#if FOO // expected-error {{expected declaration}}
+  func fn1() {}
+#endif
+}
+
 class C { // expected-note 3 {{in declaration of 'C'}}
 
 #if os(iOS)