C#: Add testexample of using named arguments when calling a delegate.

Author: michaelnebel

csharp/ql/test/library-tests/arguments/PrintAst.expected

@@ -421,3 +421,30 @@ lambdas.cs:
 #   17|           0: [IntLiteral] 7
 #   17|           1: [IntLiteral] 8
 #   17|           2: [IntLiteral] 9
+#   20|   6: [DelegateType] MyDelegate
+#-----|     2: (Parameters)
+#   20|       0: [Parameter] x
+#   20|         -1: [TypeMention] int
+#   20|       1: [Parameter] y
+#   20|         -1: [TypeMention] int
+#   22|   7: [Method] M2
+#   22|     -1: [TypeMention] Void
+#   23|     4: [BlockStmt] {...}
+#   24|       0: [LocalVariableDeclStmt] ... ...;
+#   24|         0: [LocalVariableDeclAndInitExpr] MyDelegate sum = ...
+#   24|           -1: [TypeMention] MyDelegate
+#   24|           0: [LocalVariableAccess] access to local variable sum
+#   24|           1: [LambdaExpr] (...) => ...
+#-----|             2: (Parameters)
+#   24|               0: [Parameter] x
+#   24|                 -1: [TypeMention] int
+#   24|               1: [Parameter] y
+#   24|                 -1: [TypeMention] int
+#   24|             4: [AddExpr] ... + ...
+#   24|               0: [ParameterAccess] access to parameter x
+#   24|               1: [ParameterAccess] access to parameter y
+#   25|       1: [ExprStmt] ...;
+#   25|         0: [DelegateCall] delegate call
+#   25|           -1: [LocalVariableAccess] access to local variable sum
+#   25|           0: [IntLiteral] 4
+#   25|           1: [IntLiteral] 5

csharp/ql/test/library-tests/arguments/argumentName.expected

@@ -11,3 +11,5 @@
 | arguments.cs:70:36:70:36 | 0 | x |
 | arguments.cs:78:18:78:21 | access to parameter args | args |
 | arguments.cs:78:27:78:27 | 0 | o |
+| lambdas.cs:25:16:25:16 | 4 | y |
+| lambdas.cs:25:22:25:22 | 5 | x |

csharp/ql/test/library-tests/arguments/argumentType.expected

@@ -79,3 +79,5 @@
 | lambdas.cs:17:12:17:12 | 7 | 0 |
 | lambdas.cs:17:15:17:15 | 8 | 0 |
 | lambdas.cs:17:18:17:18 | 9 | 0 |
+| lambdas.cs:25:16:25:16 | 4 | 0 |
+| lambdas.cs:25:22:25:22 | 5 | 0 |

csharp/ql/test/library-tests/arguments/lambdaArgument.expected

@@ -7,3 +7,5 @@
 | lambdas.cs:17:9:17:19 | delegate call | lambdas.cs:15:32:15:32 | x | lambdas.cs:17:12:17:12 | 7 |
 | lambdas.cs:17:9:17:19 | delegate call | lambdas.cs:15:32:15:32 | x | lambdas.cs:17:15:17:15 | 8 |
 | lambdas.cs:17:9:17:19 | delegate call | lambdas.cs:15:32:15:32 | x | lambdas.cs:17:18:17:18 | 9 |
+| lambdas.cs:25:9:25:23 | delegate call | lambdas.cs:24:31:24:31 | x | lambdas.cs:25:16:25:16 | 4 |
+| lambdas.cs:25:9:25:23 | delegate call | lambdas.cs:24:38:24:38 | y | lambdas.cs:25:22:25:22 | 5 |

csharp/ql/test/library-tests/arguments/lambdas.cs

@@ -16,4 +16,13 @@ void M1()
         l3();
         l3(7, 8, 9);
     }
+
+    delegate int MyDelegate(int x, int y);
+
+    void M2()
+    {
+        MyDelegate sum = (int x, int y) => x + y;
+        sum(y: 4, x: 5);
+    }
 }
+