diff --git a/angel_jael/analysis_options.yaml b/angel_jael/analysis_options.yaml
index 518eb901..eae1e42a 100644
--- a/angel_jael/analysis_options.yaml
+++ b/angel_jael/analysis_options.yaml
@@ -1,2 +1,3 @@
 analyzer:
-  strong-mode: true
\ No newline at end of file
+  strong-mode:
+    implicit-casts: false
\ No newline at end of file
diff --git a/angel_jael/mono_pkg.yaml b/angel_jael/mono_pkg.yaml
new file mode 100644
index 00000000..e69de29b
diff --git a/angel_jael/pubspec.yaml b/angel_jael/pubspec.yaml
index a12ca66a..adbc28d2 100644
--- a/angel_jael/pubspec.yaml
+++ b/angel_jael/pubspec.yaml
@@ -1,17 +1,17 @@
 name: angel_jael
-version: 1.0.3
+version: 2.0.0
 description: Angel support for the Jael templating engine.
 author: Tobe O <thosakwe@gmail.com>
 homepage: https://github.com/angel-dart/jael/tree/master/jael
 environment:
-  sdk: ">=1.19.0 <=2.0.0"
+  sdk: ">=2.0.0-dev <=3.0.0"
 dependencies:
-  angel_framework: ^1.0.0-dev
+  angel_framework: ^2.0.0-alpha
   code_buffer: ^1.0.0
-  file: ^2.0.0
+  file: ^5.0.0
   jael: ^1.0.0-alpha
   jael_preprocessor: ^1.0.0-alpha
-  symbol_table: ^1.0.0
+  symbol_table: ^2.0.0
 dev_dependencies:
-  angel_test: ^1.1.0-alpha
-  test: ^0.12.0
\ No newline at end of file
+  angel_test: ^2.0.0-alpha
+  test: ^1.0.0
diff --git a/jael/CHANGELOG.md b/jael/CHANGELOG.md
index 8d4bca78..ce38a408 100644
--- a/jael/CHANGELOG.md
+++ b/jael/CHANGELOG.md
@@ -1,5 +1,9 @@
+# 2.0.0
+* Dart 2 updates.
+* Remove usage of `package:dart2_constant`.
+
 # 1.0.6+1
-* Ensure `<element>` pass attributes.
+* Ensure `<element>` passes attributes.
 
 # 1.0.6
 * Add `index-as` to `for-each`.
diff --git a/jael/lib/src/renderer.dart b/jael/lib/src/renderer.dart
index 910af96d..1e6c8d68 100644
--- a/jael/lib/src/renderer.dart
+++ b/jael/lib/src/renderer.dart
@@ -1,5 +1,5 @@
+import 'dart:convert';
 import 'package:code_buffer/code_buffer.dart';
-import 'package:dart2_constant/convert.dart';
 import 'package:symbol_table/symbol_table.dart';
 import 'ast/ast.dart';
 import 'text/parser.dart';
@@ -54,8 +54,8 @@ class Renderer {
       buf
         ..writeln('<li>')
         ..indent()
-        ..writeln('<b>$type:</b> ${error.span.start.toolString}: ${error
-            .message}')
+        ..writeln(
+            '<b>$type:</b> ${error.span.start.toolString}: ${error.message}')
         ..writeln('<br>')
         ..writeln(
           '<span style="color: red;">' +
diff --git a/jael/lib/src/text/parser.dart b/jael/lib/src/text/parser.dart
index 5f8de467..8e457058 100644
--- a/jael/lib/src/text/parser.dart
+++ b/jael/lib/src/text/parser.dart
@@ -68,8 +68,10 @@ class Parser {
 
   StringLiteral implicitString() {
     if (next(TokenType.string)) {
-      return prefixParselets[TokenType.string].parse(this, _current) as StringLiteral;
-    } /*else if (next(TokenType.text)) {
+      return prefixParselets[TokenType.string].parse(this, _current)
+          as StringLiteral;
+    }
+    /*else if (next(TokenType.text)) {
 
     }*/
 
@@ -264,8 +266,7 @@ class Parser {
     if (tagName2.name != tagName.name) {
       errors.add(new JaelError(
           JaelErrorSeverity.error,
-          'Mismatched closing tags. Expected "${tagName.span
-              .text}"; got "${tagName2.name}" instead.',
+          'Mismatched closing tags. Expected "${tagName.span.text}"; got "${tagName2.name}" instead.',
           lt2.span));
       return null;
     }
diff --git a/jael/mono_pkg.yaml b/jael/mono_pkg.yaml
new file mode 100644
index 00000000..e69de29b
diff --git a/jael/pubspec.yaml b/jael/pubspec.yaml
index 8f4c7899..70a3967d 100644
--- a/jael/pubspec.yaml
+++ b/jael/pubspec.yaml
@@ -1,16 +1,15 @@
 name: jael
-version: 1.0.6+1
+version: 2.0.0
 description:  A simple server-side HTML templating engine for Dart.
 author: Tobe O <thosakwe@gmail.com>
 homepage: https://github.com/angel-dart/jael/tree/master/jael
 environment:
-  sdk: ">=1.19.0 <=2.0.0"
+  sdk: ">=2.0.0-dev <=3.0.0"
 dependencies:
   charcode: ^1.0.0
   code_buffer: ^1.0.0
-  dart2_constant: ^1.0.0
   source_span: ^1.0.0
   string_scanner: ^1.0.0
-  symbol_table: ^1.0.0
+  symbol_table: ^2.0.0
 dev_dependencies:
-  test: ^0.12.0
\ No newline at end of file
+  test: ^1.0.0
\ No newline at end of file
diff --git a/jael/test/render/custom_element_test.dart b/jael/test/render/custom_element_test.dart
index 08aef101..2546b34f 100644
--- a/jael/test/render/custom_element_test.dart
+++ b/jael/test/render/custom_element_test.dart
@@ -18,13 +18,16 @@ void main() {
     var html = render(template, {'sqrt': sqrt});
     print(html);
 
-    expect(html, '''
+    expect(
+        html,
+        '''
 <div>
   <div>
     The square root of 16 is 4.
   </div>
 </div>
-    '''.trim());
+    '''
+            .trim());
   });
 
   test('render into explicit tag name', () {
@@ -40,13 +43,16 @@ void main() {
     var html = render(template, {'sqrt': sqrt});
     print(html);
 
-    expect(html, '''
+    expect(
+        html,
+        '''
 <div>
   <span>
     The square root of 16 is 4.
   </span>
 </div>
-    '''.trim());
+    '''
+            .trim());
   });
 
   test('pass attributes', () {
@@ -62,13 +68,16 @@ void main() {
     var html = render(template, {'sqrt': sqrt});
     print(html);
 
-    expect(html, '''
+    expect(
+        html,
+        '''
 <div>
   <div foo="bar" baz="quux">
     The square root of 16 is 4.
   </div>
 </div>
-    '''.trim());
+    '''
+            .trim());
   });
 
   test('render without tag name', () {
@@ -84,12 +93,15 @@ void main() {
     var html = render(template, {'sqrt': sqrt});
     print(html);
 
-    expect(html, '''
+    expect(
+        html,
+        '''
 <div>
   The square root of 16 is 4.
       
 </div>
-    '''.trim());
+    '''
+            .trim());
   });
 }
 
diff --git a/jael/test/render/render_test.dart b/jael/test/render/render_test.dart
index 2515d395..d10e4bc6 100644
--- a/jael/test/render/render_test.dart
+++ b/jael/test/render/render_test.dart
@@ -21,7 +21,7 @@ main() {
 
     try {
       document = jael.parseDocument(template, sourceUrl: 'test.jl');
-      scope = new SymbolTable(values: {
+      scope = new SymbolTable<dynamic>(values: {
         'csrf_token': 'foo',
         'profile': {
           'avatar': 'thosakwe.png',
@@ -67,7 +67,7 @@ main() {
     var buf = new CodeBuffer();
     //jael.scan(template, sourceUrl: 'test.jl').tokens.forEach(print);
     var document = jael.parseDocument(template, sourceUrl: 'test.jl');
-    var scope = new SymbolTable(values: {
+    var scope = new SymbolTable<dynamic>(values: {
       'pokemon': const _Pokemon('Darkrai', 'Dark'),
     });
 
@@ -107,7 +107,7 @@ main() {
 
     var buf = new CodeBuffer();
     var document = jael.parseDocument(template, sourceUrl: 'test.jl');
-    var scope = new SymbolTable(values: {
+    var scope = new SymbolTable<dynamic>(values: {
       'starters': starters,
     });
 
@@ -152,7 +152,7 @@ main() {
 
     var buf = new CodeBuffer();
     var document = jael.parseDocument(template, sourceUrl: 'test.jl');
-    var scope = new SymbolTable(values: {
+    var scope = new SymbolTable<dynamic>(values: {
       'starters': starters,
     });
 
@@ -300,7 +300,7 @@ main() {
 
     var buf = new CodeBuffer();
     var document = jael.parseDocument(template, sourceUrl: 'test.jl');
-    var scope = new SymbolTable(values: {
+    var scope = new SymbolTable<dynamic>(values: {
       'account': new _Account(isDisabled: true),
     });
 
@@ -327,7 +327,7 @@ main() {
 
     var buf = new CodeBuffer();
     var document = jael.parseDocument(template, sourceUrl: 'test.jl');
-    var scope = new SymbolTable(values: {
+    var scope = new SymbolTable<dynamic>(values: {
       'account': new _Account(isDisabled: null),
     });
 
diff --git a/jael/test/text/scan_test.dart b/jael/test/text/scan_test.dart
index 080aace7..7632d8d2 100644
--- a/jael/test/text/scan_test.dart
+++ b/jael/test/text/scan_test.dart
@@ -83,7 +83,8 @@ main() {
 <script aria-label="script">
   window.alert('a string');
 </script>
-'''.trim(),
+'''
+          .trim(),
       sourceUrl: 'test.jl',
     ).tokens;
     tokens.forEach(print);
diff --git a/jael_preprocessor/analysis_options.yaml b/jael_preprocessor/analysis_options.yaml
index 518eb901..eae1e42a 100644
--- a/jael_preprocessor/analysis_options.yaml
+++ b/jael_preprocessor/analysis_options.yaml
@@ -1,2 +1,3 @@
 analyzer:
-  strong-mode: true
\ No newline at end of file
+  strong-mode:
+    implicit-casts: false
\ No newline at end of file
diff --git a/jael_preprocessor/lib/jael_preprocessor.dart b/jael_preprocessor/lib/jael_preprocessor.dart
index 260d9313..9f89323a 100644
--- a/jael_preprocessor/lib/jael_preprocessor.dart
+++ b/jael_preprocessor/lib/jael_preprocessor.dart
@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:collection';
 import 'package:file/file.dart';
 import 'package:jael/jael.dart';
+import 'package:symbol_table/symbol_table.dart';
 
 /// Modifies a Jael document.
 typedef FutureOr<Document> Patcher(Document document,
@@ -18,6 +19,7 @@ Future<Document> resolve(Document document, Directory currentDirectory,
   // Resolve all includes...
   var includesResolved =
       await resolveIncludes(document, currentDirectory, onError);
+
   var patched =
       await applyInheritance(includesResolved, currentDirectory, onError);
 
@@ -68,26 +70,63 @@ Future<Document> applyInheritance(Document document, Directory currentDirectory,
     // by filling in blocks.
     document = chain.removeFirst();
 
+    var blocks = new SymbolTable<Element>();
+
     while (chain.isNotEmpty) {
       var child = chain.removeFirst();
-      var blocks = extractBlockDeclarations(child.root, onError);
+      var scope = blocks;
+      extractBlockDeclarations(scope, child.root, onError);
       var blocksExpanded =
           await expandBlocks(document.root, blocks, currentDirectory, onError);
+
+      if (blocksExpanded == null) {
+        // This in itself is a block; expand it.
+        // TODO: Ambiguous
+
+      }
+
       document =
           new Document(child.doctype ?? document.doctype, blocksExpanded);
     }
 
     // Fill in any remaining blocks
     var blocksExpanded =
-        await expandBlocks(document.root, {}, currentDirectory, onError);
+        await expandBlocks(document.root, blocks, currentDirectory, onError);
     return new Document(document.doctype, blocksExpanded);
   }
 }
 
+List<Element> allBlocksRecursive(Element element) {
+  var out = <Element>[];
+
+  for (var e in element.children) {
+    if (e is Element && e.tagName.name == 'block') {
+      out.add(e);
+    }
+  }
+
+  for (var child in element.children) {
+    if (child is Element) {
+      var childBlocks = allBlocksRecursive(child);
+      out.addAll(childBlocks);
+//
+//      if (childBlocks.isNotEmpty) {
+//        print('<<<\n${child.span.highlight()}');
+//
+//        for (var b in childBlocks) {
+//          print('!!!!\n${b.span.highlight()}');
+//        }
+//      }
+    }
+  }
+
+  return out; //out.reversed.toList();
+}
+
 /// Extracts any `block` declarations.
-Map<String, Element> extractBlockDeclarations(
-    Element element, void onError(JaelError error)) {
-  Map<String, Element> blocks = {};
+void extractBlockDeclarations(SymbolTable<Element> blocks, Element element,
+    void onError(JaelError error)) {
+  //var blockElements = allBlocksRecursive(element);
   var blockElements =
       element.children.where((e) => e is Element && e.tagName.name == 'block');
 
@@ -104,11 +143,9 @@ Map<String, Element> extractBlockDeclarations(
           nameAttr.span));
     } else {
       var name = (nameAttr.value as StringLiteral).value;
-      blocks[name] = blockElement;
+      blocks.assign(name, blockElement);
     }
   }
-
-  return blocks;
 }
 
 /// Finds the name of the parent template.
@@ -134,8 +171,10 @@ String getParent(Document document, void onError(JaelError error)) {
 }
 
 /// Replaces any `block` tags within the element.
-Future<Element> expandBlocks(Element element, Map<String, Element> blocks,
+Future<Element> expandBlocks(Element element, SymbolTable<Element> blockss,
     Directory currentDirectory, void onError(JaelError error)) async {
+  var blocks = blockss.createChild();
+
   if (element is SelfClosingElement)
     return element;
   else if (element is RegularElement) {
@@ -166,10 +205,11 @@ Future<Element> expandBlocks(Element element, Map<String, Element> blocks,
             var name = (nameAttr.value as StringLiteral).value;
             Iterable<ElementChild> children;
 
-            if (!blocks.containsKey(name)) {
+            if (blocks.resolve(name) == null) {
+              print('Hm what? $name');
               children = child.children;
             } else {
-              children = blocks[name].children;
+              children = blocks.resolve(name).value.children;
             }
 
             expanded.addAll(children);
@@ -184,21 +224,62 @@ Future<Element> expandBlocks(Element element, Map<String, Element> blocks,
     }
 
     // Resolve all includes...
-    expanded = await Future.wait(expanded.map((c) {
-      if (c is! Element) return new Future.value(c);
-      return expandBlocks(c, blocks, currentDirectory, onError);
-    }));
+    var out = <ElementChild>[];
 
-    return new RegularElement(
+    for (var c in expanded) {
+      if (c is Element) {
+        var blocksExpanded =
+            await expandBlocks(c, blocks, currentDirectory, onError);
+        var nameAttr = c.attributes
+            .firstWhere((a) => a.name == 'name', orElse: () => null);
+        var name = (nameAttr?.value is StringLiteral)
+            ? ((nameAttr.value as StringLiteral).value)
+            : null;
+
+        if (name == null) {
+          out.add(blocksExpanded);
+        } else {
+          // This element itself resolved to a block; expand it.
+          out.addAll(blocks.resolve(name)?.value?.children ?? <ElementChild>[]);
+        }
+      } else {
+        out.add(c);
+      }
+    }
+
+    var finalElement = new RegularElement(
         element.lt,
         element.tagName,
         element.attributes,
         element.gt,
-        expanded,
+        out,
         element.lt2,
         element.slash,
         element.tagName2,
         element.gt2);
+
+    // If THIS element is a block, it needs to be expanded as well.
+    if (element.tagName.name == 'block') {
+      var nameAttr = element.attributes
+          .firstWhere((a) => a.name == 'name', orElse: () => null);
+      if (nameAttr == null) {
+        onError(new JaelError(JaelErrorSeverity.warning,
+            'Missing "name" attribute in "block" tag.', element.span));
+      } else if (nameAttr.value is! StringLiteral) {
+        onError(new JaelError(
+            JaelErrorSeverity.warning,
+            'The "name" attribute in an "block" tag must be a string literal.',
+            nameAttr.span));
+      }
+
+      var name = (nameAttr.value as StringLiteral).value;
+      print('def $name');
+      blockss.assign(name, finalElement);
+
+      return null;
+    } else {
+      return finalElement;
+    }
   } else {
     throw new UnsupportedError(
         'Unsupported element type: ${element.runtimeType}');
diff --git a/jael_preprocessor/mono_pkg.yaml b/jael_preprocessor/mono_pkg.yaml
new file mode 100644
index 00000000..e69de29b
diff --git a/jael_preprocessor/pubspec.yaml b/jael_preprocessor/pubspec.yaml
index 70b111e1..2355ac85 100644
--- a/jael_preprocessor/pubspec.yaml
+++ b/jael_preprocessor/pubspec.yaml
@@ -6,7 +6,7 @@ homepage: https://github.com/angel-dart/jael/tree/master/jael_processor
 environment:
   sdk: ">=1.19.0 <=2.0.0"
 dependencies:
-  file: ^2.0.0
+  file: ^5.0.0
   jael: ^1.0.0-alpha
 dev_dependencies:
   test: ^0.12.0
\ No newline at end of file
diff --git a/jael_preprocessor/test/block_test.dart b/jael_preprocessor/test/block_test.dart
index b91edb90..2cb16cc4 100644
--- a/jael_preprocessor/test/block_test.dart
+++ b/jael_preprocessor/test/block_test.dart
@@ -29,11 +29,19 @@ main() {
 
     // e.jl
     fileSystem.file('e.jl').writeAsStringSync(
-        '<extend src="c.jl"><block name="greeting">Angel <block name="name">default</block></block></extend>');
+        '<extend src="c.jl"><block name="greeting">Angel <b><block name="name">default</block></b></block></extend>');
 
-    // e.jl
-    fileSystem.file('f.jl').writeAsStringSync(
-        '<extend src="e.jl"><block name="name">framework</block></extend>');
+    // fox.jl
+    fileSystem.file('fox.jl').writeAsStringSync(
+        '<block name="dance">The name is <block name="name"></block></block>');
+
+    // trot.jl
+    fileSystem.file('trot.jl').writeAsStringSync(
+        '<extend src="fox.jl"><block name="name">CONGA <i><block name="exclaim">YEAH</block></i></block></extend>');
+
+    // foxtrot.jl
+    fileSystem.file('foxtrot.jl').writeAsStringSync(
+        '<extend src="trot.jl"><block name="exclaim">framework</block></extend>');
   });
 
   test('blocks are replaced or kept', () async {
@@ -87,7 +95,7 @@ main() {
   });
 
   test('blocks within blocks', () async {
-    var file = fileSystem.file('f.jl');
+    var file = fileSystem.file('foxtrot.jl');
     var original = jael.parseDocument(await file.readAsString(),
         sourceUrl: file.uri, onError: (e) => throw e);
     var processed = await jael.resolve(