C# extractor: Handle the type name of dynamic.

csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/Name.cs

@@ -43,6 +43,7 @@ namespace Semmle.Extraction.CSharp.Entities.Expressions
             {
                 case SymbolKind.TypeParameter:
                 case SymbolKind.NamedType:
+                case SymbolKind.DynamicType:
                     return TypeAccess.Create(info);
 
                 case SymbolKind.Property:

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

@@ -119,3 +119,18 @@ class LiteralConversions
         new Point { x=1, y=2 };
     }
 }
+
+class DynamicType
+{
+    void F()
+    {
+        dynamic t = (dynamic)null;
+    }
+}
+
+class LocalVariableTags
+{
+    Func<int, int> F = x => { int y=x; return y; };
+}
+
+// semmle-extractor-options: /r:System.Dynamic.Runtime.dll

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

@@ -52,3 +52,10 @@
 | Program.cs:114:16:114:19 | Nullable<Int32> |
 | Program.cs:117:5:117:8 | Void |
 | Program.cs:119:13:119:17 | Point |
+| Program.cs:125:5:125:8 | Void |
+| Program.cs:127:9:127:15 | dynamic |
+| Program.cs:127:22:127:28 | dynamic |
+| Program.cs:133:5:133:8 | Func<Int32,Int32> |
+| Program.cs:133:10:133:12 | Int32 |
+| Program.cs:133:15:133:17 | Int32 |
+| Program.cs:133:31:133:33 | Int32 |