Fix breakages from analyzer 0.39.16

Author: joebingham-wk

tools/analyzer_plugin/lib/src/diagnostic/arrow_function_prop.dart

@@ -3,7 +3,6 @@ import 'package:analyzer_plugin/protocol/protocol_common.dart';
 import 'package:analyzer_plugin/utilities/fixes/fixes.dart';
 import 'package:over_react_analyzer_plugin/src/diagnostic_contributor.dart';
 import 'package:over_react_analyzer_plugin/src/fluent_interface_util.dart';
-import 'package:over_react_analyzer_plugin/src/util/ast_util.dart';
 
 const _desc = "Props can't be cascaded after unparenthesized arrow functions.";
 // <editor-fold desc="Documentation Details">

tools/analyzer_plugin/lib/src/diagnostic/boilerplate_validator.dart

@@ -253,16 +253,6 @@ extension on SourceSpan {
   SourceRange asRangeOrEmpty() => this == null ? SourceRange.EMPTY : asRange();
 }
 
-extension<E> on Iterable<E> {
-  void forEachIndexed(void Function(E, int) callback) {
-    var i = 0;
-    forEach((e) {
-      callback(e, i);
-      i++;
-    });
-  }
-}
-
 // TODO use the version from over_react instead after initial release
 Iterable<PartDirective> getNonGeneratedParts(CompilationUnit libraryUnit) {
   return libraryUnit.directives

tools/analyzer_plugin/lib/src/diagnostic/missing_cascade_parens.dart

@@ -1,6 +1,6 @@
 // ignore: deprecated_member_use
 import 'package:analyzer/analyzer.dart'
-    show CompileTimeErrorCode, NodeLocator, StaticTypeWarningCode, StaticWarningCode;
+    show CompileTimeErrorCode, NodeLocator;
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:over_react_analyzer_plugin/src/util/react_types.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart';
@@ -63,16 +63,16 @@ class MissingCascadeParensDiagnostic extends DiagnosticContributor {
   computeErrors(result, collector) async {
     for (final error in result.errors) {
       final isBadFunction = const {
-        StaticTypeWarningCode.INVOCATION_OF_NON_FUNCTION,
-        StaticTypeWarningCode.INVOCATION_OF_NON_FUNCTION_EXPRESSION,
+        CompileTimeErrorCode.INVOCATION_OF_NON_FUNCTION,
+        CompileTimeErrorCode.INVOCATION_OF_NON_FUNCTION_EXPRESSION,
       }.contains(error.errorCode);
       final isBadArity = const {
         CompileTimeErrorCode.NOT_ENOUGH_POSITIONAL_ARGUMENTS,
         CompileTimeErrorCode.EXTRA_POSITIONAL_ARGUMENTS_COULD_BE_NAMED,
         CompileTimeErrorCode.EXTRA_POSITIONAL_ARGUMENTS,
       }.contains(error.errorCode);
       final isVoidUsage = const {
-        StaticWarningCode.USE_OF_VOID_RESULT,
+        CompileTimeErrorCode.USE_OF_VOID_RESULT,
       }.contains(error.errorCode);
 
       if (isBadFunction || isBadArity || isVoidUsage) {

web/component2/src/demos/ref.dart

@@ -179,7 +179,7 @@ mixin RefDemoProps on UiProps {}
 
 final RefDemoContainer = uiFunction<RefDemoProps>(
   (props) {
-    // `uiForwardRef` Refs
+    // `uiForwardRef` Refs 
     final buttonNodeRefForSimpleFunctionComponent = createRef<Element>();
     final buttonNodeRefForComplexFunctionComponent = createRef<Element>();
     final buttonNodeRefForSimpleComponent = createRef<Element>();