Test parse of invalid #elif typo

Author: TiagoMaiaL

Tests/SwiftParserTest/translated/IfconfigExprTests.swift

@@ -493,7 +493,28 @@ final class IfconfigExprTests: XCTestCase {
       """
     )
   }
-
+  
+  func testIfConfigExpr34() {
+    AssertParse(
+      """
+      #if MY_FLAG
+      #
+      elif
+      #endif
+      """
+    )
+  }
+  
+  func testIfConfigExpr35() {
+    AssertParse(
+      """
+      #if MY_FLAG
+      # elif
+      #endif
+      """
+    )
+  }
+  
   func testUnknownPlatform1() {
     AssertParse(
       """