C#: Add struct source model example.

Author: michaelnebel

csharp/ql/test/library-tests/dataflow/external-models/Sources.cs

@@ -21,6 +21,9 @@ void Foo()
 
             x = TaggedSrcPropertyGetter;
             x = this[0];
+
+            S s;
+            StructSrc(s);
         }
 
         [SourceAttribute]
@@ -65,7 +68,10 @@ void SrcArg(object src) { }
 
         [SourceAttribute]
         object this[int i] => null;
+
+        void StructSrc(S s) { }
     }
 
+    struct S { }
     class SourceAttribute : System.Attribute { }
 }

csharp/ql/test/library-tests/dataflow/external-models/srcs.expected

@@ -11,9 +11,9 @@ invalidModelRow
 | Sources.cs:20:17:20:33 | call to method SrcTwoArg | local |
 | Sources.cs:22:17:22:39 | access to property TaggedSrcPropertyGetter | local |
 | Sources.cs:23:17:23:23 | access to indexer | local |
-| Sources.cs:27:14:27:20 | this | local |
-| Sources.cs:27:29:27:45 | taggedMethodParam | local |
-| Sources.cs:31:47:31:60 | taggedSrcParam | local |
-| Sources.cs:43:45:43:45 | p | local |
-| Sources.cs:50:50:50:50 | p | local |
-| Sources.cs:56:16:56:30 | this | local |
+| Sources.cs:30:14:30:20 | this | local |
+| Sources.cs:30:29:30:45 | taggedMethodParam | local |
+| Sources.cs:34:47:34:60 | taggedSrcParam | local |
+| Sources.cs:46:45:46:45 | p | local |
+| Sources.cs:53:50:53:50 | p | local |
+| Sources.cs:59:16:59:30 | this | local |

csharp/ql/test/library-tests/dataflow/external-models/srcs.ext.yml

@@ -19,3 +19,4 @@ extensions:
       - ["My.Qltest", "SourceAttribute", false, "", "", "Attribute", "", "local", "manual"]
       - ["My.Qltest", "SourceAttribute", false, "", "", "Attribute.Getter", "ReturnValue", "local", "manual"]
       - ["My.Qltest", "A", false, "SrcTwoArg", "(System.String,System.String)", "", "ReturnValue", "local", "manual"]
+      - ["My.Qltest", "A", false, "StructSrc", "", "", "Argument[0]", "local", "manual"]