emit interfaces before use

lib/runtime/dart/_internal.js

 var _internal;
 (function(exports) {
   'use strict';
-  class EfficientLength extends core.Object {
-  }
+  class EfficientLength extends core.Object {}
   let ListIterable$ = dart.generic(function(E) {
     class ListIterable extends collection.IterableBase$(E) {
       ListIterable() {
         super.IterableBase();
       }
       get iterator() {
         return new ListIterator(this);
       }
       forEach(action) {
         let length = this.length;
@@ skipping 834 matching lines @@
       }
       get current() {
         return null;
       }
     }
     EmptyIterator[dart.implements] = [core.Iterator$(E)];
     return EmptyIterator;
   });
   let EmptyIterator = EmptyIterator$(dart.dynamic);
   let BidirectionalIterator$ = dart.generic(function(T) {
-    class BidirectionalIterator extends core.Object {
-    }
+    class BidirectionalIterator extends core.Object {}
     BidirectionalIterator[dart.implements] = [core.Iterator$(T)];
     return BidirectionalIterator;
   });
   let BidirectionalIterator = BidirectionalIterator$(dart.dynamic);
   let _rangeCheck = Symbol('_rangeCheck');
   let IterableMixinWorkaround$ = dart.generic(function(T) {
     class IterableMixinWorkaround extends core.Object {
       static contains(iterable, element) {
         for (let e of iterable) {
           if (dart.equals(e, element))
@@ skipping 470 matching lines @@
         if (fillValue === void 0)
           fillValue = null;
         throw new core.UnsupportedError("Cannot modify an unmodifiable list");
       }
     }
     UnmodifiableListMixin[dart.implements] = [core.List$(E)];
     return UnmodifiableListMixin;
   });
   let UnmodifiableListMixin = UnmodifiableListMixin$(dart.dynamic);
   let FixedLengthListBase$ = dart.generic(function(E) {
-    class FixedLengthListBase extends dart.mixin(FixedLengthListMixin$(E)) {
-    }
+    class FixedLengthListBase extends dart.mixin(FixedLengthListMixin$(E)) {}
     return FixedLengthListBase;
   });
   let FixedLengthListBase = FixedLengthListBase$(dart.dynamic);
   let UnmodifiableListBase$ = dart.generic(function(E) {
-    class UnmodifiableListBase extends dart.mixin(UnmodifiableListMixin$(E)) {
-    }
+    class UnmodifiableListBase extends dart.mixin(UnmodifiableListMixin$(E)) {}
     return UnmodifiableListBase;
   });
   let UnmodifiableListBase = UnmodifiableListBase$(dart.dynamic);
   let _backedList = Symbol('_backedList');
   class _ListIndicesIterable extends ListIterable$(core.int) {
     _ListIndicesIterable(backedList) {
       this[_backedList] = backedList;
       super.ListIterable();
     }
     get length() {
@@ skipping 529 matching lines @@
   exports.ReversedListIterable$ = ReversedListIterable$;
   exports.UnmodifiableListError = UnmodifiableListError;
   exports.NonGrowableListError = NonGrowableListError;
   exports.makeListFixedLength = makeListFixedLength;
   exports.Lists = Lists;
   exports.printToConsole = printToConsole;
   exports.Sort = Sort;
   exports.Symbol = Symbol;
   exports.POWERS_OF_TEN = POWERS_OF_TEN;
 })(_internal || (_internal = {}));