Add methods to struct example

Author: andrewjl

CodeGeneration/Sources/SyntaxSupport/DeclNodes.swift

@@ -1820,6 +1820,14 @@ public let DECL_NODES: [Node] = [
           struct SomeStruct {
               let someMember: String
               var anotherMember: Int
+
+              func foo() {
+                print(someMember)
+              }
+
+              mutating func bar() {
+                anotherMember = 42
+              }
           }
           ```