FEA-1781: Avoid indexing synthetic functions with no definition

Dockerfile

@@ -1 +1 @@
-FROM drydock-prod.workiva.net/workiva/dart_build_image:3 as build
+FROM scratch

lib/src/scip_visitor.dart

@@ -84,6 +84,15 @@ class ScipVisitor extends GeneralizingAstVisitor {
   void _visitSimpleIdentifier(SimpleIdentifier node) {
     var element = node.staticElement;
 
+    // Both `.loadLibrary()`, and `.call()` are synthetic functions that
+    // have no definition. These should therefore should not be indexed.
+    if (element is FunctionElement && element.isSynthetic) {
+      if ([
+        FunctionElement.LOAD_LIBRARY_NAME,
+        FunctionElement.CALL_METHOD_NAME,
+      ].contains(element.name)) return;
+    }
+
     // [element] for assignment fields is null. If the parent node
     // is a `CompoundAssignmentExpression`, we know this node is referring
     // to an assignment line. In that case, use the read/write element attached

snapshots/input/basic-project/lib/other.dart

@@ -1,3 +1,5 @@
+import 'more.dart' deferred as more;
+
 class Foo {
   int _far;
   Foo(this._far);
@@ -11,4 +13,10 @@ class Bar {
     _someValue = 'asdf';
     print(_someValue);
   }
+}
+
+void main() {
+  more.loadLibrary().then((_) => {
+    Bar('a').someMethod.call()
+  });
 }

snapshots/output/basic-project/lib/other.dart

@@ -1,5 +1,9 @@
-  class Foo {
+  import 'more.dart' deferred as more;
 // definition scip-dart pub dart_test 1.0.0 lib/other.dart/
+//                               ^^^^ definition scip-dart pub dart_test 1.0.0 lib/other.dart/more.
+//                               documentation ```dart
+
+  class Foo {
 //      ^^^ definition scip-dart pub dart_test 1.0.0 lib/other.dart/Foo#
 //      documentation ```dart
     int _far;
@@ -40,3 +44,17 @@
 //          ^^^^^^^^^^ reference local 2
     }
   }
+
+  void main() {
+//     ^^^^ definition scip-dart pub dart_test 1.0.0 lib/other.dart/main().
+//     documentation ```dart
+    more.loadLibrary().then((_) => {
+//  ^^^^ reference scip-dart pub dart_test 1.0.0 lib/other.dart/more.
+//                     ^^^^ reference scip-dart pub dart:async 2.18.0 dart:async/future.dart/Future#then().
+//                           ^ definition local 4
+//                           documentation ```dart
+      Bar('a').someMethod.call()
+//    ^^^ reference scip-dart pub dart_test 1.0.0 lib/other.dart/Bar#
+//             ^^^^^^^^^^ reference scip-dart pub dart_test 1.0.0 lib/other.dart/Bar#someMethod().
+    });
+  }