When summarize AST, include local variables in loops and try-catch.

pkg/analyzer/lib/src/dart/element/builder.dart

Index: pkg/analyzer/lib/src/dart/element/builder.dart
diff --git a/pkg/analyzer/lib/src/dart/element/builder.dart b/pkg/analyzer/lib/src/dart/element/builder.dart
index 2754786b2d386b1ae0e686fbaf073bab180abad1..280327359ea7bf71e4521ef622988c63c40faab5 100644
--- a/pkg/analyzer/lib/src/dart/element/builder.dart
+++ b/pkg/analyzer/lib/src/dart/element/builder.dart
@@ -370,6 +370,7 @@ class ElementBuilder extends RecursiveAstVisitor<Object> {
       if (node.exceptionType == null) {
         exception.hasImplicitType = true;
       }
+      exception.setVisibleRange(node.offset, node.length);
       _currentHolder.addLocalVariable(exception);
       exceptionParameter.staticElement = exception;
       // stack trace
@@ -378,6 +379,7 @@ class ElementBuilder extends RecursiveAstVisitor<Object> {
         LocalVariableElementImpl stackTrace =
             new LocalVariableElementImpl.forNode(stackTraceParameter);
         _setCodeRange(stackTrace, stackTraceParameter);
+        stackTrace.setVisibleRange(node.offset, node.length);
         _currentHolder.addLocalVariable(stackTrace);
         stackTraceParameter.staticElement = stackTrace;
       }