diff --git a/blockly_uncompressed.js b/blockly_uncompressed.js
index 025026fdf..e614f8079 100644
--- a/blockly_uncompressed.js
+++ b/blockly_uncompressed.js
@@ -26,7 +26,7 @@ goog.addDependency('../../core/block_animations.js', ['Blockly.blockAnimations']
 goog.addDependency('../../core/block_drag_surface.js', ['Blockly.BlockDragSurfaceSvg'], ['Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Svg', 'Blockly.utils.dom'], {});
 goog.addDependency('../../core/block_dragger.js', ['Blockly.BlockDragger'], ['Blockly.Events', 'Blockly.Events.BlockDrag', 'Blockly.Events.BlockMove', 'Blockly.InsertionMarkerManager', 'Blockly.blockAnimations', 'Blockly.constants', 'Blockly.utils.Coordinate', 'Blockly.utils.dom'], {});
 goog.addDependency('../../core/block_svg.js', ['Blockly.BlockSvg'], ['Blockly.ASTNode', 'Blockly.Block', 'Blockly.ContextMenu', 'Blockly.ContextMenuRegistry', 'Blockly.Events', 'Blockly.Events.BlockMove', 'Blockly.Events.Selected', 'Blockly.Msg', 'Blockly.RenderedConnection', 'Blockly.TabNavigateCursor', 'Blockly.Tooltip', 'Blockly.Touch', 'Blockly.Xml', 'Blockly.blockAnimations', 'Blockly.blockRendering.IPathObject', 'Blockly.browserEvents', 'Blockly.connectionTypes', 'Blockly.constants', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Rect', 'Blockly.utils.deprecation', 'Blockly.utils.dom', 'Blockly.utils.object', 'Blockly.utils.userAgent'], {});
-goog.addDependency('../../core/blockly.js', ['Blockly'], ['Blockly.Events', 'Blockly.Events.BlockCreate', 'Blockly.Events.FinishedLoading', 'Blockly.Events.Ui', 'Blockly.Events.UiBase', 'Blockly.Events.VarCreate', 'Blockly.Procedures', 'Blockly.ShortcutRegistry', 'Blockly.Tooltip', 'Blockly.Touch', 'Blockly.Variables', 'Blockly.WidgetDiv', 'Blockly.WorkspaceSvg', 'Blockly.Xml', 'Blockly.browserEvents', 'Blockly.connectionTypes', 'Blockly.constants', 'Blockly.inject', 'Blockly.inputTypes', 'Blockly.utils', 'Blockly.utils.Size', 'Blockly.utils.colour'], {});
+goog.addDependency('../../core/blockly.js', ['Blockly'], ['Blockly.Events', 'Blockly.Events.BlockCreate', 'Blockly.Events.FinishedLoading', 'Blockly.Events.Ui', 'Blockly.Events.UiBase', 'Blockly.Events.VarCreate', 'Blockly.Procedures', 'Blockly.ShortcutRegistry', 'Blockly.Tooltip', 'Blockly.Touch', 'Blockly.Variables', 'Blockly.WidgetDiv', 'Blockly.WorkspaceSvg', 'Blockly.Xml', 'Blockly.browserEvents', 'Blockly.connectionTypes', 'Blockly.constants', 'Blockly.inject', 'Blockly.inputTypes', 'Blockly.utils', 'Blockly.utils.Size', 'Blockly.utils.colour', 'Blockly.utils.deprecation', 'Blockly.utils.toolbox'], {});
 goog.addDependency('../../core/blocks.js', ['Blockly.Blocks'], [], {});
 goog.addDependency('../../core/browser_events.js', ['Blockly.browserEvents'], ['Blockly.Touch'], {});
 goog.addDependency('../../core/bubble.js', ['Blockly.Bubble'], ['Blockly.Scrollbar', 'Blockly.Touch', 'Blockly.Workspace', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Size', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.math', 'Blockly.utils.userAgent'], {});
@@ -72,18 +72,18 @@ goog.addDependency('../../core/field_number.js', ['Blockly.FieldNumber'], ['Bloc
 goog.addDependency('../../core/field_registry.js', ['Blockly.fieldRegistry'], ['Blockly.registry'], {});
 goog.addDependency('../../core/field_textinput.js', ['Blockly.FieldTextInput'], ['Blockly.Events', 'Blockly.Events.BlockChange', 'Blockly.Field', 'Blockly.Msg', 'Blockly.browserEvents', 'Blockly.fieldRegistry', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.KeyCodes', 'Blockly.utils.aria', 'Blockly.utils.dom', 'Blockly.utils.object', 'Blockly.utils.userAgent'], {});
 goog.addDependency('../../core/field_variable.js', ['Blockly.FieldVariable'], ['Blockly.Events.BlockChange', 'Blockly.FieldDropdown', 'Blockly.Msg', 'Blockly.VariableModel', 'Blockly.Variables', 'Blockly.Xml', 'Blockly.constants', 'Blockly.fieldRegistry', 'Blockly.utils', 'Blockly.utils.Size', 'Blockly.utils.object'], {});
-goog.addDependency('../../core/flyout_base.js', ['Blockly.Flyout'], ['Blockly.Block', 'Blockly.Events', 'Blockly.Events.BlockCreate', 'Blockly.Events.VarCreate', 'Blockly.Gesture', 'Blockly.ScrollbarPair', 'Blockly.Tooltip', 'Blockly.Touch', 'Blockly.WorkspaceSvg', 'Blockly.Xml', 'Blockly.blockRendering', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.toolbox', 'Blockly.utils.xml'], {});
+goog.addDependency('../../core/flyout_base.js', ['Blockly.Flyout'], ['Blockly.Block', 'Blockly.Events', 'Blockly.Events.BlockCreate', 'Blockly.Events.VarCreate', 'Blockly.FlyoutMetricsManager', 'Blockly.Gesture', 'Blockly.ScrollbarPair', 'Blockly.Tooltip', 'Blockly.Touch', 'Blockly.WorkspaceSvg', 'Blockly.Xml', 'Blockly.blockRendering', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.toolbox', 'Blockly.utils.xml'], {});
 goog.addDependency('../../core/flyout_button.js', ['Blockly.FlyoutButton'], ['Blockly.Css', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Svg', 'Blockly.utils.dom'], {'lang': 'es5'});
-goog.addDependency('../../core/flyout_horizontal.js', ['Blockly.HorizontalFlyout'], ['Blockly.Block', 'Blockly.Flyout', 'Blockly.Scrollbar', 'Blockly.WidgetDiv', 'Blockly.constants', 'Blockly.registry', 'Blockly.utils', 'Blockly.utils.Rect', 'Blockly.utils.object'], {});
-goog.addDependency('../../core/flyout_vertical.js', ['Blockly.VerticalFlyout'], ['Blockly.Block', 'Blockly.Flyout', 'Blockly.Scrollbar', 'Blockly.WidgetDiv', 'Blockly.constants', 'Blockly.registry', 'Blockly.utils', 'Blockly.utils.Rect', 'Blockly.utils.object'], {});
+goog.addDependency('../../core/flyout_horizontal.js', ['Blockly.HorizontalFlyout'], ['Blockly.Block', 'Blockly.Flyout', 'Blockly.Scrollbar', 'Blockly.WidgetDiv', 'Blockly.constants', 'Blockly.registry', 'Blockly.utils', 'Blockly.utils.Rect', 'Blockly.utils.object', 'Blockly.utils.toolbox'], {});
+goog.addDependency('../../core/flyout_vertical.js', ['Blockly.VerticalFlyout'], ['Blockly.Block', 'Blockly.Flyout', 'Blockly.Scrollbar', 'Blockly.WidgetDiv', 'Blockly.constants', 'Blockly.registry', 'Blockly.utils', 'Blockly.utils.Rect', 'Blockly.utils.object', 'Blockly.utils.toolbox'], {});
 goog.addDependency('../../core/generator.js', ['Blockly.Generator'], ['Blockly.Block', 'Blockly.constants'], {});
 goog.addDependency('../../core/gesture.js', ['Blockly.Gesture'], ['Blockly.BlockDragger', 'Blockly.BubbleDragger', 'Blockly.Events', 'Blockly.Events.Click', 'Blockly.Tooltip', 'Blockly.Touch', 'Blockly.WorkspaceDragger', 'Blockly.blockAnimations', 'Blockly.browserEvents', 'Blockly.constants', 'Blockly.utils', 'Blockly.utils.Coordinate'], {});
 goog.addDependency('../../core/grid.js', ['Blockly.Grid'], ['Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.userAgent'], {});
 goog.addDependency('../../core/icon.js', ['Blockly.Icon'], ['Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Size', 'Blockly.utils.Svg', 'Blockly.utils.dom'], {});
 goog.addDependency('../../core/inject.js', ['Blockly.inject'], ['Blockly.BlockDragSurfaceSvg', 'Blockly.Css', 'Blockly.DropDownDiv', 'Blockly.Events', 'Blockly.Grid', 'Blockly.Msg', 'Blockly.Options', 'Blockly.ScrollbarPair', 'Blockly.Tooltip', 'Blockly.WorkspaceDragSurfaceSvg', 'Blockly.WorkspaceSvg', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Svg', 'Blockly.utils.aria', 'Blockly.utils.dom', 'Blockly.utils.userAgent'], {});
-goog.addDependency('../../core/input.js', ['Blockly.Input'], ['Blockly.Connection', 'Blockly.constants', 'Blockly.fieldRegistry', 'Blockly.inputTypes'], {'lang': 'es5'});
+goog.addDependency('../../core/input.js', ['Blockly.Input'], ['Blockly.Connection', 'Blockly.FieldLabel', 'Blockly.constants', 'Blockly.fieldRegistry', 'Blockly.inputTypes'], {'lang': 'es5'});
 goog.addDependency('../../core/input_types.js', ['Blockly.inputTypes'], ['Blockly.connectionTypes'], {});
-goog.addDependency('../../core/insertion_marker_manager.js', ['Blockly.InsertionMarkerManager'], ['Blockly.Block', 'Blockly.Events', 'Blockly.blockAnimations', 'Blockly.connectionTypes', 'Blockly.constants'], {'lang': 'es5'});
+goog.addDependency('../../core/insertion_marker_manager.js', ['Blockly.InsertionMarkerManager'], ['Blockly.Events', 'Blockly.blockAnimations', 'Blockly.connectionTypes', 'Blockly.constants'], {'lang': 'es5'});
 goog.addDependency('../../core/interfaces/i_accessibility.js', ['Blockly.IASTNodeLocation', 'Blockly.IASTNodeLocationSvg', 'Blockly.IASTNodeLocationWithBlock', 'Blockly.IKeyboardAccessible'], [], {});
 goog.addDependency('../../core/interfaces/i_bounded_element.js', ['Blockly.IBoundedElement'], [], {});
 goog.addDependency('../../core/interfaces/i_bubble.js', ['Blockly.IBubble'], [], {});
@@ -112,12 +112,13 @@ goog.addDependency('../../core/keyboard_nav/tab_navigate_cursor.js', ['Blockly.T
 goog.addDependency('../../core/marker_manager.js', ['Blockly.MarkerManager'], ['Blockly.Cursor', 'Blockly.Marker'], {});
 goog.addDependency('../../core/menu.js', ['Blockly.Menu'], ['Blockly.browserEvents', 'Blockly.utils.Coordinate', 'Blockly.utils.KeyCodes', 'Blockly.utils.aria', 'Blockly.utils.dom', 'Blockly.utils.style'], {});
 goog.addDependency('../../core/menuitem.js', ['Blockly.MenuItem'], ['Blockly.utils.IdGenerator', 'Blockly.utils.aria', 'Blockly.utils.dom'], {});
-goog.addDependency('../../core/metrics_manager.js', ['Blockly.MetricsManager'], ['Blockly.IMetricsManager', 'Blockly.registry', 'Blockly.utils.Size'], {'lang': 'es5'});
+goog.addDependency('../../core/metrics_manager.js', ['Blockly.FlyoutMetricsManager', 'Blockly.MetricsManager'], ['Blockly.IMetricsManager', 'Blockly.registry', 'Blockly.utils.Size', 'Blockly.utils.toolbox'], {'lang': 'es5'});
 goog.addDependency('../../core/msg.js', ['Blockly.Msg'], ['Blockly.utils.global'], {});
 goog.addDependency('../../core/mutator.js', ['Blockly.Mutator'], ['Blockly.Bubble', 'Blockly.Events', 'Blockly.Events.BlockChange', 'Blockly.Events.BubbleOpen', 'Blockly.Icon', 'Blockly.WorkspaceSvg', 'Blockly.Xml', 'Blockly.utils', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.object', 'Blockly.utils.toolbox', 'Blockly.utils.xml'], {});
 goog.addDependency('../../core/names.js', ['Blockly.Names'], ['Blockly.Msg', 'Blockly.constants'], {});
 goog.addDependency('../../core/options.js', ['Blockly.Options'], ['Blockly.Theme', 'Blockly.Themes.Classic', 'Blockly.registry', 'Blockly.utils.IdGenerator', 'Blockly.utils.Metrics', 'Blockly.utils.toolbox'], {});
 goog.addDependency('../../core/plugin_manager.js', ['Blockly.PluginManager'], [], {});
+goog.addDependency('../../core/positionable_test.js', ['Blockly.PositionableTest'], [], {'lang': 'es5'});
 goog.addDependency('../../core/procedures.js', ['Blockly.Procedures'], ['Blockly.Blocks', 'Blockly.Events', 'Blockly.Events.BlockChange', 'Blockly.Field', 'Blockly.Msg', 'Blockly.Names', 'Blockly.Workspace', 'Blockly.Xml', 'Blockly.constants', 'Blockly.utils.xml'], {});
 goog.addDependency('../../core/registry.js', ['Blockly.registry'], [], {});
 goog.addDependency('../../core/rendered_connection.js', ['Blockly.RenderedConnection'], ['Blockly.Connection', 'Blockly.connectionTypes', 'Blockly.constants', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Svg', 'Blockly.utils.deprecation', 'Blockly.utils.dom', 'Blockly.utils.object'], {});
@@ -180,7 +181,7 @@ goog.addDependency('../../core/toolbox/toolbox_item.js', ['Blockly.ToolboxItem']
 goog.addDependency('../../core/tooltip.js', ['Blockly.Tooltip'], ['Blockly.browserEvents', 'Blockly.utils.string'], {});
 goog.addDependency('../../core/touch.js', ['Blockly.Touch'], ['Blockly.constants', 'Blockly.utils', 'Blockly.utils.global', 'Blockly.utils.string'], {});
 goog.addDependency('../../core/touch_gesture.js', ['Blockly.TouchGesture'], ['Blockly.Gesture', 'Blockly.browserEvents', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.object'], {});
-goog.addDependency('../../core/trashcan.js', ['Blockly.Trashcan'], ['Blockly.Events', 'Blockly.Events.TrashcanOpen', 'Blockly.IPositionable', 'Blockly.Scrollbar', 'Blockly.Xml', 'Blockly.browserEvents', 'Blockly.constants', 'Blockly.utils.Rect', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.math', 'Blockly.utils.toolbox'], {'lang': 'es5'});
+goog.addDependency('../../core/trashcan.js', ['Blockly.Trashcan'], ['Blockly.Events', 'Blockly.Events.TrashcanOpen', 'Blockly.IPositionable', 'Blockly.Scrollbar', 'Blockly.Xml', 'Blockly.browserEvents', 'Blockly.constants', 'Blockly.registry', 'Blockly.utils.Rect', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.math', 'Blockly.utils.toolbox'], {'lang': 'es5'});
 goog.addDependency('../../core/utils.js', ['Blockly.utils'], ['Blockly.Msg', 'Blockly.constants', 'Blockly.utils.Coordinate', 'Blockly.utils.Rect', 'Blockly.utils.colour', 'Blockly.utils.global', 'Blockly.utils.string', 'Blockly.utils.style', 'Blockly.utils.userAgent'], {});
 goog.addDependency('../../core/utils/aria.js', ['Blockly.utils.aria'], [], {});
 goog.addDependency('../../core/utils/colour.js', ['Blockly.utils.colour'], [], {});
@@ -215,9 +216,9 @@ goog.addDependency('../../core/workspace_comment_render_svg.js', ['Blockly.Works
 goog.addDependency('../../core/workspace_comment_svg.js', ['Blockly.WorkspaceCommentSvg'], ['Blockly.Css', 'Blockly.Events', 'Blockly.Events.CommentCreate', 'Blockly.Events.CommentDelete', 'Blockly.Events.CommentMove', 'Blockly.Events.Selected', 'Blockly.WorkspaceComment', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Rect', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.object'], {});
 goog.addDependency('../../core/workspace_drag_surface_svg.js', ['Blockly.WorkspaceDragSurfaceSvg'], ['Blockly.utils', 'Blockly.utils.Svg', 'Blockly.utils.dom'], {});
 goog.addDependency('../../core/workspace_dragger.js', ['Blockly.WorkspaceDragger'], ['Blockly.utils.Coordinate'], {});
-goog.addDependency('../../core/workspace_svg.js', ['Blockly.WorkspaceSvg'], ['Blockly.BlockSvg', 'Blockly.ConnectionDB', 'Blockly.ContextMenu', 'Blockly.ContextMenuRegistry', 'Blockly.Events', 'Blockly.Events.BlockCreate', 'Blockly.Events.ThemeChange', 'Blockly.Events.ViewportChange', 'Blockly.Gesture', 'Blockly.Grid', 'Blockly.MarkerManager', 'Blockly.MetricsManager', 'Blockly.Msg', 'Blockly.Options', 'Blockly.PluginManager', 'Blockly.ThemeManager', 'Blockly.Themes.Classic', 'Blockly.TouchGesture', 'Blockly.Workspace', 'Blockly.WorkspaceAudio', 'Blockly.WorkspaceDragSurfaceSvg', 'Blockly.Xml', 'Blockly.blockRendering', 'Blockly.browserEvents', 'Blockly.constants', 'Blockly.registry', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Metrics', 'Blockly.utils.Rect', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.object', 'Blockly.utils.toolbox'], {'lang': 'es5'});
+goog.addDependency('../../core/workspace_svg.js', ['Blockly.WorkspaceSvg'], ['Blockly.BlockSvg', 'Blockly.ConnectionDB', 'Blockly.ContextMenu', 'Blockly.ContextMenuRegistry', 'Blockly.Events', 'Blockly.Events.BlockCreate', 'Blockly.Events.ThemeChange', 'Blockly.Events.ViewportChange', 'Blockly.Gesture', 'Blockly.Grid', 'Blockly.MarkerManager', 'Blockly.MetricsManager', 'Blockly.Msg', 'Blockly.Options', 'Blockly.PluginManager', 'Blockly.ThemeManager', 'Blockly.Themes.Classic', 'Blockly.TouchGesture', 'Blockly.Workspace', 'Blockly.WorkspaceAudio', 'Blockly.WorkspaceDragSurfaceSvg', 'Blockly.Xml', 'Blockly.blockRendering', 'Blockly.browserEvents', 'Blockly.constants', 'Blockly.registry', 'Blockly.utils', 'Blockly.utils.Coordinate', 'Blockly.utils.Metrics', 'Blockly.utils.Rect', 'Blockly.utils.Size', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.object', 'Blockly.utils.toolbox'], {'lang': 'es5'});
 goog.addDependency('../../core/xml.js', ['Blockly.Xml'], ['Blockly.Events', 'Blockly.constants', 'Blockly.inputTypes', 'Blockly.utils', 'Blockly.utils.Size', 'Blockly.utils.dom', 'Blockly.utils.xml'], {});
-goog.addDependency('../../core/zoom_controls.js', ['Blockly.ZoomControls'], ['Blockly.Css', 'Blockly.Events', 'Blockly.Events.Click', 'Blockly.IPositionable', 'Blockly.Scrollbar', 'Blockly.Touch', 'Blockly.browserEvents', 'Blockly.constants', 'Blockly.utils.Rect', 'Blockly.utils.Svg', 'Blockly.utils.dom'], {'lang': 'es5'});
+goog.addDependency('../../core/zoom_controls.js', ['Blockly.ZoomControls'], ['Blockly.Css', 'Blockly.Events', 'Blockly.Events.Click', 'Blockly.IPositionable', 'Blockly.Scrollbar', 'Blockly.Touch', 'Blockly.browserEvents', 'Blockly.constants', 'Blockly.utils.Rect', 'Blockly.utils.Svg', 'Blockly.utils.dom', 'Blockly.utils.toolbox'], {'lang': 'es5'});
 goog.addDependency("base.js", [], []);
 
 // Load Blockly.
diff --git a/core/block.js b/core/block.js
index 835e2be5b..a3e6b01ac 100644
--- a/core/block.js
+++ b/core/block.js
@@ -266,12 +266,13 @@ Blockly.Block.CommentModel;
  * The language-neutral id given to the collapsed input.
  * @const {string}
  */
-Blockly.Block.COLLAPSED_INPUT_NAME = '_TEMP_COLLAPSED_INPUT';
+Blockly.Block.COLLAPSED_INPUT_NAME = Blockly.constants.COLLAPSED_INPUT_NAME;
+
 /**
  * The language-neutral id given to the collapsed field.
  * @const {string}
  */
-Blockly.Block.COLLAPSED_FIELD_NAME = '_TEMP_COLLAPSED_FIELD';
+Blockly.Block.COLLAPSED_FIELD_NAME = Blockly.constants.COLLAPSED_FIELD_NAME;
 
 /**
  * Optional text data that round-trips between blocks and XML.
@@ -1389,7 +1390,7 @@ Blockly.Block.prototype.toString = function(opt_maxLength, opt_emptyToken) {
         break;
       case Blockly.ASTNode.types.FIELD:
         var field = /** @type {Blockly.Field} */ (node.getLocation());
-        if (field.name != Blockly.Block.COLLAPSED_FIELD_NAME) {
+        if (field.name != Blockly.constants.COLLAPSED_FIELD_NAME) {
           text.push(field.getText());
         }
         break;
diff --git a/core/block_svg.js b/core/block_svg.js
index 643dfb5be..26124f8ed 100644
--- a/core/block_svg.js
+++ b/core/block_svg.js
@@ -662,8 +662,8 @@ Blockly.BlockSvg.prototype.setCollapsed = function(collapsed) {
  */
 Blockly.BlockSvg.prototype.updateCollapsed_ = function() {
   var collapsed = this.isCollapsed();
-  var collapsedInputName = Blockly.Block.COLLAPSED_INPUT_NAME;
-  var collapsedFieldName = Blockly.Block.COLLAPSED_FIELD_NAME;
+  var collapsedInputName = Blockly.constants.COLLAPSED_INPUT_NAME;
+  var collapsedFieldName = Blockly.constants.COLLAPSED_FIELD_NAME;
 
   for (var i = 0, input; (input = this.inputList[i]); i++) {
     if (input.name != collapsedInputName) {
diff --git a/core/constants.js b/core/constants.js
index c6f228ef0..bf3c675ae 100644
--- a/core/constants.js
+++ b/core/constants.js
@@ -219,3 +219,15 @@ Blockly.RENAME_VARIABLE_ID = 'RENAME_VARIABLE_ID';
  * @const {string}
  */
 Blockly.DELETE_VARIABLE_ID = 'DELETE_VARIABLE_ID';
+
+/**
+ * The language-neutral id given to the collapsed input.
+ * @const {string}
+ */
+Blockly.constants.COLLAPSED_INPUT_NAME = '_TEMP_COLLAPSED_INPUT';
+
+/**
+ * The language-neutral id given to the collapsed field.
+ * @const {string}
+ */
+Blockly.constants.COLLAPSED_FIELD_NAME = '_TEMP_COLLAPSED_FIELD';
diff --git a/core/input.js b/core/input.js
index f3e1ea440..d898ce351 100644
--- a/core/input.js
+++ b/core/input.js
@@ -16,6 +16,8 @@ goog.require('Blockly.Connection');
 /** @suppress {extraRequire} */
 goog.require('Blockly.constants');
 goog.require('Blockly.fieldRegistry');
+/** @suppress {extraRequire} */
+goog.require('Blockly.FieldLabel');
 goog.require('Blockly.inputTypes');
 
 goog.requireType('Blockly.Block');
diff --git a/core/insertion_marker_manager.js b/core/insertion_marker_manager.js
index fc6c32fe5..dc69e44df 100644
--- a/core/insertion_marker_manager.js
+++ b/core/insertion_marker_manager.js
@@ -12,7 +12,6 @@
 
 goog.provide('Blockly.InsertionMarkerManager');
 
-goog.require('Blockly.Block');
 goog.require('Blockly.blockAnimations');
 goog.require('Blockly.connectionTypes');
 /** @suppress {extraRequire} */
@@ -276,7 +275,7 @@ Blockly.InsertionMarkerManager.prototype.createMarkerBlock_ = function(sourceBlo
     // child blocks here.
     for (var i = 0; i < sourceBlock.inputList.length; i++) {
       var sourceInput = sourceBlock.inputList[i];
-      if (sourceInput.name == Blockly.Block.COLLAPSED_INPUT_NAME) {
+      if (sourceInput.name == Blockly.constants.COLLAPSED_INPUT_NAME) {
         continue;  // Ignore the collapsed input.
       }
       var resultInput = result.inputList[i];