C#: Extractor tests for

- While statements
- Object initializers

csharp/ql/test/library-tests/regressions/Program.cs

@@ -81,3 +81,28 @@ class Designations
         return 0;
     }
 }
+
+class WhileIs
+{
+    void Test()
+    {
+        object x = null;
+        while(x is string s)
+        {
+            var y = s;
+        }
+    }
+}
+
+class ObjectInitializerType
+{
+    struct Point
+    {
+        public object Name;
+    }
+
+    void F()
+    {
+        new Point() { Name = "Bob" };
+    }
+}

csharp/ql/test/library-tests/regressions/TypeMentions.expected

@@ -39,3 +39,10 @@
 | Program.cs:69:5:69:8 | Boolean |
 | Program.cs:69:16:69:18 | Int32 |
 | Program.cs:75:5:75:7 | Int32 |
+| Program.cs:87:5:87:8 | Void |
+| Program.cs:89:9:89:14 | Object |
+| Program.cs:90:20:90:25 | String |
+| Program.cs:92:13:92:15 | String |
+| Program.cs:101:16:101:21 | Object |
+| Program.cs:104:5:104:8 | Void |
+| Program.cs:106:13:106:17 | Point |

csharp/ql/test/library-tests/regressions/WhileIs.expected

@@ -0,0 +1 @@
+| Program.cs:92:21:92:21 | access to local variable s |

csharp/ql/test/library-tests/regressions/WhileIs.ql

@@ -0,0 +1,5 @@
+import csharp
+
+from LocalVariable decl
+where decl.getName() = "s"
+select decl.getAnAccess()