Fixes #254 - Better stacktrace support

lib/runtime/dart/_interceptors.js

 dart_library.library('dart/_interceptors', null, /* Imports */[
   "dart_runtime/dart",
   'dart/core',
   'dart/_internal',
   'dart/collection',
   'dart/math'
 ], /* Lazy imports */[
   'dart/_js_helper'
 ], function(exports, dart, core, _internal, collection, math, _js_helper) {
   'use strict';
@@ skipping 68 matching lines @@
       }
       static markGrowable(allocation) {
         return JSArray$().typed(allocation);
       }
       static markFixedList(list) {
         list.fixed$length = Array;
         return list;
       }
       [dartx.checkGrowable](reason) {
         if (this.fixed$length) {
-          throw new core.UnsupportedError(dart.as(reason, core.String));
+          dart.throw(new core.UnsupportedError(dart.as(reason, core.String)));
         }
       }
       [dartx.add](value) {
         dart.as(value, E);
         this[dartx.checkGrowable]('add');
         this.push(value);
       }
       [dartx.removeAt](index) {
         if (!(typeof index == 'number'))
-          throw new core.ArgumentError(index);
+          dart.throw(new core.ArgumentError(index));
         if (dart.notNull(index) < 0 || dart.notNull(index) >= dart.notNull(this[dartx.length])) {
-          throw new core.RangeError.value(index);
+          dart.throw(new core.RangeError.value(index));
         }
         this[dartx.checkGrowable]('removeAt');
         return this.splice(index, 1)[0];
       }
       [dartx.insert](index, value) {
         dart.as(value, E);
         if (!(typeof index == 'number'))
-          throw new core.ArgumentError(index);
+          dart.throw(new core.ArgumentError(index));
         if (dart.notNull(index) < 0 || dart.notNull(index) > dart.notNull(this[dartx.length])) {
-          throw new core.RangeError.value(index);
+          dart.throw(new core.RangeError.value(index));
         }
         this[dartx.checkGrowable]('insert');
         this.splice(index, 0, value);
       }
       [dartx.insertAll](index, iterable) {
         dart.as(iterable, core.Iterable$(E));
         this[dartx.checkGrowable]('insertAll');
         _internal.IterableMixinWorkaround.insertAllList(this, index, iterable);
       }
       [dartx.setAll](index, iterable) {
         dart.as(iterable, core.Iterable$(E));
         _internal.IterableMixinWorkaround.setAllList(this, index, iterable);
       }
       [dartx.removeLast]() {
         this[dartx.checkGrowable]('removeLast');
         if (this[dartx.length] == 0)
-          throw new core.RangeError.value(-1);
+          dart.throw(new core.RangeError.value(-1));
         return dart.as(this.pop(), E);
       }
       [dartx.remove](element) {
         this[dartx.checkGrowable]('remove');
         for (let i = 0; dart.notNull(i) < dart.notNull(this[dartx.length]); i = dart.notNull(i) + 1) {
           if (dart.equals(this[dartx.get](i), element)) {
             this.splice(i, 1);
             return true;
           }
         }
@@ skipping 23 matching lines @@
       }
       [dartx.clear]() {
         this[dartx.length] = 0;
       }
       [dartx.forEach](f) {
         dart.as(f, dart.functionType(dart.void, [E]));
         let length = this[dartx.length];
         for (let i = 0; dart.notNull(i) < dart.notNull(length); i = dart.notNull(i) + 1) {
           f(dart.as(this[i], E));
           if (length != this[dartx.length]) {
-            throw new core.ConcurrentModificationError(this);
+            dart.throw(new core.ConcurrentModificationError(this));
           }
         }
       }
       [dartx.map](f) {
         dart.as(f, dart.functionType(dart.dynamic, [E]));
         return _internal.IterableMixinWorkaround.mapList(this, f);
       }
       [dartx.join](separator) {
         if (separator === void 0)
           separator = "";
@@ skipping 42 matching lines @@
         return dart.as(_internal.IterableMixinWorkaround.singleWhere(this, test), E);
       }
       [dartx.elementAt](index) {
         return this[dartx.get](index);
       }
       [dartx.sublist](start, end) {
         if (end === void 0)
           end = null;
         _js_helper.checkNull(start);
         if (!(typeof start == 'number'))
-          throw new core.ArgumentError(start);
+          dart.throw(new core.ArgumentError(start));
         if (dart.notNull(start) < 0 || dart.notNull(start) > dart.notNull(this[dartx.length])) {
-          throw new core.RangeError.range(start, 0, this[dartx.length]);
+          dart.throw(new core.RangeError.range(start, 0, this[dartx.length]));
         }
         if (end == null) {
           end = this[dartx.length];
         } else {
           if (!(typeof end == 'number'))
-            throw new core.ArgumentError(end);
+            dart.throw(new core.ArgumentError(end));
           if (dart.notNull(end) < dart.notNull(start) || dart.notNull(end) > dart.notNull(this[dartx.length])) {
-            throw new core.RangeError.range(end, start, this[dartx.length]);
+            dart.throw(new core.RangeError.range(end, start, this[dartx.length]));
           }
         }
         if (start == end)
           return dart.list([], E);
         return JSArray$(E).typed(this.slice(start, end));
       }
       [dartx.getRange](start, end) {
         return new (_internal.IterableMixinWorkaround$(E))().getRangeList(this, start, end);
       }
       get [dartx.first]() {
         if (dart.notNull(this[dartx.length]) > 0)
           return this[dartx.get](0);
-        throw new core.StateError("No elements");
+        dart.throw(new core.StateError("No elements"));
       }
       get [dartx.last]() {
         if (dart.notNull(this[dartx.length]) > 0)
           return this[dartx.get](dart.notNull(this[dartx.length]) - 1);
-        throw new core.StateError("No elements");
+        dart.throw(new core.StateError("No elements"));
       }
       get [dartx.single]() {
         if (this[dartx.length] == 1)
           return this[dartx.get](0);
         if (this[dartx.length] == 0)
-          throw new core.StateError("No elements");
-        throw new core.StateError("More than one element");
+          dart.throw(new core.StateError("No elements"));
+        dart.throw(new core.StateError("More than one element"));
       }
       [dartx.removeRange](start, end) {
         this[dartx.checkGrowable]('removeRange');
         let receiverLength = this[dartx.length];
         if (dart.notNull(start) < 0 || dart.notNull(start) > dart.notNull(receiverLength)) {
-          throw new core.RangeError.range(start, 0, receiverLength);
+          dart.throw(new core.RangeError.range(start, 0, receiverLength));
         }
         if (dart.notNull(end) < dart.notNull(start) || dart.notNull(end) > dart.notNull(receiverLength)) {
-          throw new core.RangeError.range(end, start, receiverLength);
+          dart.throw(new core.RangeError.range(end, start, receiverLength));
         }
         _internal.Lists.copy(this, end, this, start, dart.notNull(receiverLength) - dart.notNull(end));
         this[dartx.length] = dart.notNull(receiverLength) - (dart.notNull(end) - dart.notNull(start));
       }
       [dartx.setRange](start, end, iterable, skipCount) {
         dart.as(iterable, core.Iterable$(E));
         if (skipCount === void 0)
           skipCount = 0;
         _internal.IterableMixinWorkaround.setRangeList(this, start, end, iterable, skipCount);
       }
@@ skipping 69 matching lines @@
         return new (_internal.ListIterator$(E))(this);
       }
       get hashCode() {
         return _js_helper.Primitives.objectHashCode(this);
       }
       get [dartx.length]() {
         return dart.as(this.length, core.int);
       }
       set [dartx.length](newLength) {
         if (!(typeof newLength == 'number'))
-          throw new core.ArgumentError(newLength);
+          dart.throw(new core.ArgumentError(newLength));
         if (dart.notNull(newLength) < 0)
-          throw new core.RangeError.value(newLength);
+          dart.throw(new core.RangeError.value(newLength));
         this[dartx.checkGrowable]('set length');
         this.length = newLength;
       }
       [dartx.get](index) {
         if (!(typeof index == 'number'))
-          throw new core.ArgumentError(index);
+          dart.throw(new core.ArgumentError(index));
         if (dart.notNull(index) >= dart.notNull(this[dartx.length]) || dart.notNull(index) < 0)
-          throw new core.RangeError.value(index);
+          dart.throw(new core.RangeError.value(index));
         return dart.as(this[index], E);
       }
       [dartx.set](index, value) {
         dart.as(value, E);
         if (!(typeof index == 'number'))
-          throw new core.ArgumentError(index);
+          dart.throw(new core.ArgumentError(index));
         if (dart.notNull(index) >= dart.notNull(this[dartx.length]) || dart.notNull(index) < 0)
-          throw new core.RangeError.value(index);
+          dart.throw(new core.RangeError.value(index));
         this[index] = value;
       }
       [dartx.asMap]() {
         return new (_internal.IterableMixinWorkaround$(E))().asMapList(this);
       }
     }
     dart.setBaseClass(JSArray, dart.global.Array);
     JSArray[dart.implements] = () => [core.List$(E), JSIndexable];
     dart.setSignature(JSArray, {
       constructors: () => ({
@@ skipping 134 matching lines @@
     '<=',
     '>=',
     'runtimeType'
   ]);
   class JSNumber extends Interceptor {
     JSNumber() {
       super.Interceptor();
     }
     [dartx.compareTo](b) {
       if (!dart.is(b, core.num))
-        throw new core.ArgumentError(b);
+        dart.throw(new core.ArgumentError(b));
       if (dart.notNull(this[dartx['<']](b))) {
         return -1;
       } else if (dart.notNull(this[dartx['>']](b))) {
         return 1;
       } else if (dart.equals(this, b)) {
         if (dart.equals(this, 0)) {
           let bIsNegative = b[dartx.isNegative];
           if (this[dartx.isNegative] == bIsNegative)
             return 0;
           if (dart.notNull(this[dartx.isNegative]))
@@ skipping 18 matching lines @@
     }
     get [dartx.isInfinite]() {
       return this == Infinity || this == -Infinity;
     }
     get [dartx.isFinite]() {
       return isFinite(this);
     }
     [dartx.remainder](b) {
       _js_helper.checkNull(b);
       if (!dart.is(b, core.num))
-        throw new core.ArgumentError(b);
+        dart.throw(new core.ArgumentError(b));
       return this % b;
     }
     [dartx.abs]() {
       return Math.abs(this);
     }
     get [dartx.sign]() {
       return dart.notNull(this[dartx['>']](0)) ? 1 : dart.notNull(this[dartx['<']](0)) ? -1 : this;
     }
     [dartx.toInt]() {
       if (dart.notNull(this[dartx['>=']](JSNumber._MIN_INT32)) && dart.notNull(this[dartx['<=']](JSNumber._MAX_INT32))) {
         return this | 0;
       }
       if (isFinite(this)) {
         return this[dartx.truncateToDouble]() + 0;
       }
-      throw new core.UnsupportedError('' + this);
+      dart.throw(new core.UnsupportedError('' + this));
     }
     [dartx.truncate]() {
       return this[dartx.toInt]();
     }
     [dartx.ceil]() {
       return this[dartx.ceilToDouble]()[dartx.toInt]();
     }
     [dartx.floor]() {
       return this[dartx.floorToDouble]()[dartx.toInt]();
     }
@@ skipping 11 matching lines @@
         return -Math.round(-this);
       } else {
         return Math.round(this);
       }
     }
     [dartx.truncateToDouble]() {
       return dart.notNull(this[dartx['<']](0)) ? this[dartx.ceilToDouble]() : this[dartx.floorToDouble]();
     }
     [dartx.clamp](lowerLimit, upperLimit) {
       if (!dart.is(lowerLimit, core.num))
-        throw new core.ArgumentError(lowerLimit);
+        dart.throw(new core.ArgumentError(lowerLimit));
       if (!dart.is(upperLimit, core.num))
-        throw new core.ArgumentError(upperLimit);
+        dart.throw(new core.ArgumentError(upperLimit));
       if (dart.notNull(lowerLimit[dartx.compareTo](upperLimit)) > 0) {
-        throw new core.ArgumentError(lowerLimit);
+        dart.throw(new core.ArgumentError(lowerLimit));
       }
       if (dart.notNull(this[dartx.compareTo](lowerLimit)) < 0)
         return lowerLimit;
       if (dart.notNull(this[dartx.compareTo](upperLimit)) > 0)
         return upperLimit;
       return this;
     }
     [dartx.toDouble]() {
       return this;
     }
     [dartx.toStringAsFixed](fractionDigits) {
       _js_helper.checkInt(fractionDigits);
       if (dart.notNull(fractionDigits) < 0 || dart.notNull(fractionDigits) > 20) {
-        throw new core.RangeError(fractionDigits);
+        dart.throw(new core.RangeError(fractionDigits));
       }
       let result = this.toFixed(fractionDigits);
       if (dart.equals(this, 0) && dart.notNull(this[dartx.isNegative]))
         return `-${result}`;
       return result;
     }
     [dartx.toStringAsExponential](fractionDigits) {
       if (fractionDigits === void 0)
         fractionDigits = null;
       let result = null;
       if (fractionDigits != null) {
         _js_helper.checkInt(fractionDigits);
         if (dart.notNull(fractionDigits) < 0 || dart.notNull(fractionDigits) > 20) {
-          throw new core.RangeError(fractionDigits);
+          dart.throw(new core.RangeError(fractionDigits));
         }
         result = this.toExponential(fractionDigits);
       } else {
         result = this.toExponential();
       }
       if (dart.equals(this, 0) && dart.notNull(this[dartx.isNegative]))
         return `-${result}`;
       return result;
     }
     [dartx.toStringAsPrecision](precision) {
       _js_helper.checkInt(precision);
       if (dart.notNull(precision) < 1 || dart.notNull(precision) > 21) {
-        throw new core.RangeError(precision);
+        dart.throw(new core.RangeError(precision));
       }
       let result = this.toPrecision(precision);
       if (dart.equals(this, 0) && dart.notNull(this[dartx.isNegative]))
         return `-${result}`;
       return result;
     }
     [dartx.toRadixString](radix) {
       _js_helper.checkInt(radix);
       if (dart.notNull(radix) < 2 || dart.notNull(radix) > 36)
-        throw new core.RangeError(radix);
+        dart.throw(new core.RangeError(radix));
       let result = this.toString(radix);
       let rightParenCode = 41;
       if (result[dartx.codeUnitAt](dart.notNull(result[dartx.length]) - 1) != rightParenCode) {
         return result;
       }
       return JSNumber._handleIEtoString(result);
     }
     static _handleIEtoString(result) {
       let match = /^([\da-z]+)(?:\.([\da-z]+))?\(e\+(\d+)\)$/.exec(result);
       if (match == null) {
-        throw new core.UnsupportedError(`Unexpected toString result: ${result}`);
+        dart.throw(new core.UnsupportedError(`Unexpected toString result: ${result}`));
       }
       result = dart.dindex(match, 1);
       let exponent = +dart.dindex(match, 3);
       if (dart.dindex(match, 2) != null) {
         result = result + dart.dindex(match, 2);
         exponent = dart.notNull(exponent) - dart.dindex(match, 2).length;
       }
       return dart.notNull(result) + "0"[dartx['*']](exponent);
     }
     toString() {
       if (dart.equals(this, 0) && 1 / this < 0) {
         return '-0.0';
       } else {
         return "" + this;
       }
     }
     get hashCode() {
       return this & 0x1FFFFFFF;
     }
     [dartx['unary-']]() {
       return -this;
     }
     [dartx['+']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this + other;
     }
     [dartx['-']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this - other;
     }
     [dartx['/']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this / other;
     }
     [dartx['*']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this * other;
     }
     [dartx['%']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       let result = this % other;
       if (result == 0)
         return 0;
       if (dart.notNull(result) > 0)
         return result;
       if (other < 0) {
         return dart.notNull(result) - other;
       } else {
         return dart.notNull(result) + other;
       }
     }
     [_isInt32](value) {
       return (value | 0) === value;
     }
     [dartx['~/']](other) {
       if (false)
         this[_tdivFast](other);
       if (dart.notNull(this[_isInt32](this)) && dart.notNull(this[_isInt32](other)) && 0 != other && -1 != other) {
         return this / other | 0;
       } else {
         return this[_tdivSlow](other);
       }
     }
     [_tdivFast](other) {
       return dart.notNull(this[_isInt32](this)) ? this / other | 0 : (this / other)[dartx.toInt]();
     }
     [_tdivSlow](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return (this / other)[dartx.toInt]();
     }
     [dartx['<<']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       if (other < 0)
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this[_shlPositive](other);
     }
     [_shlPositive](other) {
       return other > 31 ? 0 : dart.as(this << other >>> 0, core.num);
     }
     [dartx['>>']](other) {
       if (false)
         this[_shrReceiverPositive](other);
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       if (other < 0)
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this[_shrOtherPositive](other);
     }
     [_shrOtherPositive](other) {
       return this > 0 ? this[_shrBothPositive](other) : dart.as(this >> (dart.notNull(other) > 31 ? 31 : other) >>> 0, core.num);
     }
     [_shrReceiverPositive](other) {
       if (other < 0)
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this[_shrBothPositive](other);
     }
     [_shrBothPositive](other) {
       return other > 31 ? 0 : dart.as(this >>> other, core.num);
     }
     [dartx['&']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return dart.as((this & other) >>> 0, core.num);
     }
     [dartx['|']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return dart.as((this | other) >>> 0, core.num);
     }
     [dartx['^']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return dart.as((this ^ other) >>> 0, core.num);
     }
     [dartx['<']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this < other;
     }
     [dartx['>']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this > other;
     }
     [dartx['<=']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this <= other;
     }
     [dartx['>=']](other) {
       if (!dart.is(other, core.num))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this >= other;
     }
     get runtimeType() {
       return core.num;
     }
   }
   JSNumber[dart.implements] = () => [core.num];
   dart.setSignature(JSNumber, {
     constructors: () => ({JSNumber: [JSNumber, []]}),
     methods: () => ({
@@ skipping 186 matching lines @@
     'runtimeType',
     'length',
     'get'
   ]);
   class JSString extends Interceptor {
     JSString() {
       super.Interceptor();
     }
     [dartx.codeUnitAt](index) {
       if (!(typeof index == 'number'))
-        throw new core.ArgumentError(index);
+        dart.throw(new core.ArgumentError(index));
       if (dart.notNull(index) < 0)
-        throw new core.RangeError.value(index);
+        dart.throw(new core.RangeError.value(index));
       if (dart.notNull(index) >= dart.notNull(this[dartx.length]))
-        throw new core.RangeError.value(index);
+        dart.throw(new core.RangeError.value(index));
       return dart.as(this.charCodeAt(index), core.int);
     }
     [dartx.allMatches](string, start) {
       if (start === void 0)
         start = 0;
       _js_helper.checkString(string);
       _js_helper.checkInt(start);
       if (0 > dart.notNull(start) || dart.notNull(start) > dart.notNull(string[dartx.length])) {
-        throw new core.RangeError.range(start, 0, string[dartx.length]);
+        dart.throw(new core.RangeError.range(start, 0, string[dartx.length]));
       }
       return _js_helper.allMatchesInStringUnchecked(this, string, start);
     }
     [dartx.matchAsPrefix](string, start) {
       if (start === void 0)
         start = 0;
       if (dart.notNull(start) < 0 || dart.notNull(start) > dart.notNull(string[dartx.length])) {
-        throw new core.RangeError.range(start, 0, string[dartx.length]);
+        dart.throw(new core.RangeError.range(start, 0, string[dartx.length]));
       }
       if (dart.notNull(start) + dart.notNull(this[dartx.length]) > dart.notNull(string[dartx.length]))
         return null;
       for (let i = 0; dart.notNull(i) < dart.notNull(this[dartx.length]); i = dart.notNull(i) + 1) {
         if (string[dartx.codeUnitAt](dart.notNull(start) + dart.notNull(i)) != this[dartx.codeUnitAt](i)) {
           return null;
         }
       }
       return new _js_helper.StringMatch(start, string, this);
     }
     [dartx['+']](other) {
       if (!(typeof other == 'string'))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return this + other;
     }
     [dartx.endsWith](other) {
       _js_helper.checkString(other);
       let otherLength = other[dartx.length];
       if (dart.notNull(otherLength) > dart.notNull(this[dartx.length]))
         return false;
       return other == this[dartx.substring](dart.notNull(this[dartx.length]) - dart.notNull(otherLength));
     }
     [dartx.replaceAll](from, to) {
       _js_helper.checkString(to);
       return dart.as(_js_helper.stringReplaceAllUnchecked(this, from, to), core.String);
     }
     [dartx.replaceAllMapped](from, convert) {
       return this[dartx.splitMapJoin](from, {onMatch: convert});
     }
     [dartx.splitMapJoin](from, opts) {
       let onMatch = opts && 'onMatch' in opts ? opts.onMatch : null;
       let onNonMatch = opts && 'onNonMatch' in opts ? opts.onNonMatch : null;
       return dart.as(_js_helper.stringReplaceAllFuncUnchecked(this, from, onMatch, onNonMatch), core.String);
     }
     [dartx.replaceFirst](from, to, startIndex) {
       if (startIndex === void 0)
         startIndex = 0;
       _js_helper.checkString(to);
       _js_helper.checkInt(startIndex);
       if (dart.notNull(startIndex) < 0 || dart.notNull(startIndex) > dart.notNull(this[dartx.length])) {
-        throw new core.RangeError.range(startIndex, 0, this[dartx.length]);
+        dart.throw(new core.RangeError.range(startIndex, 0, this[dartx.length]));
       }
       return dart.as(_js_helper.stringReplaceFirstUnchecked(this, from, to, startIndex), core.String);
     }
     [dartx.split](pattern) {
       _js_helper.checkNull(pattern);
       if (typeof pattern == 'string') {
         return dart.as(this.split(pattern), core.List$(core.String));
       } else if (dart.is(pattern, _js_helper.JSSyntaxRegExp) && _js_helper.regExpCaptureCount(pattern) == 0) {
         let re = _js_helper.regExpGetNative(pattern);
         return dart.as(this.split(re), core.List$(core.String));
@@ skipping 19 matching lines @@
       if (dart.notNull(start) < dart.notNull(this[dartx.length]) || dart.notNull(length) > 0) {
         result[dartx.add](this[dartx.substring](start));
       }
       return result;
     }
     [dartx.startsWith](pattern, index) {
       if (index === void 0)
         index = 0;
       _js_helper.checkInt(index);
       if (dart.notNull(index) < 0 || dart.notNull(index) > dart.notNull(this[dartx.length])) {
-        throw new core.RangeError.range(index, 0, this[dartx.length]);
+        dart.throw(new core.RangeError.range(index, 0, this[dartx.length]));
       }
       if (typeof pattern == 'string') {
         let other = pattern;
         let otherLength = other[dartx.length];
         let endIndex = dart.notNull(index) + dart.notNull(otherLength);
         if (dart.notNull(endIndex) > dart.notNull(this[dartx.length]))
           return false;
         return other == this.substring(index, endIndex);
       }
       return pattern[dartx.matchAsPrefix](this, index) != null;
     }
     [dartx.substring](startIndex, endIndex) {
       if (endIndex === void 0)
         endIndex = null;
       _js_helper.checkInt(startIndex);
       if (endIndex == null)
         endIndex = this[dartx.length];
       _js_helper.checkInt(endIndex);
       if (dart.notNull(startIndex) < 0)
-        throw new core.RangeError.value(startIndex);
+        dart.throw(new core.RangeError.value(startIndex));
       if (dart.notNull(startIndex) > dart.notNull(endIndex))
-        throw new core.RangeError.value(startIndex);
+        dart.throw(new core.RangeError.value(startIndex));
       if (dart.notNull(endIndex) > dart.notNull(this[dartx.length]))
-        throw new core.RangeError.value(endIndex);
+        dart.throw(new core.RangeError.value(endIndex));
       return this.substring(startIndex, endIndex);
     }
     [dartx.toLowerCase]() {
       return this.toLowerCase();
     }
     [dartx.toUpperCase]() {
       return this.toUpperCase();
     }
     static _isWhitespace(codeUnit) {
       if (dart.notNull(codeUnit) < 256) {
@@ skipping 133 matching lines @@
       if (endIndex == 0)
         return "";
       return result.substring(0, endIndex);
     }
     [dartx['*']](times) {
       if (0 >= dart.notNull(times))
         return '';
       if (times == 1 || this[dartx.length] == 0)
         return this;
       if (!dart.equals(times, times >>> 0)) {
-        throw dart.const(new core.OutOfMemoryError());
+        dart.throw(dart.const(new core.OutOfMemoryError()));
       }
       let result = '';
       let s = this;
       while (true) {
         if ((dart.notNull(times) & 1) == 1)
           result = s[dartx['+']](result);
         times = dart.as(times >>> 1, core.int);
         if (times == 0)
           break;
         s = s[dartx['+']](s);
@@ skipping 20 matching lines @@
       return new _CodeUnits(this);
     }
     get [dartx.runes]() {
       return new core.Runes(this);
     }
     [dartx.indexOf](pattern, start) {
       if (start === void 0)
         start = 0;
       _js_helper.checkNull(pattern);
       if (!(typeof start == 'number'))
-        throw new core.ArgumentError(start);
+        dart.throw(new core.ArgumentError(start));
       if (dart.notNull(start) < 0 || dart.notNull(start) > dart.notNull(this[dartx.length])) {
-        throw new core.RangeError.range(start, 0, this[dartx.length]);
+        dart.throw(new core.RangeError.range(start, 0, this[dartx.length]));
       }
       if (typeof pattern == 'string') {
         return this.indexOf(pattern, start);
       }
       if (dart.is(pattern, _js_helper.JSSyntaxRegExp)) {
         let re = pattern;
         let match = _js_helper.firstMatchAfter(re, this, start);
         return match == null ? -1 : match.start;
       }
       for (let i = start; dart.notNull(i) <= dart.notNull(this[dartx.length]); i = dart.notNull(i) + 1) {
         if (pattern[dartx.matchAsPrefix](this, i) != null)
           return i;
       }
       return -1;
     }
     [dartx.lastIndexOf](pattern, start) {
       if (start === void 0)
         start = null;
       _js_helper.checkNull(pattern);
       if (start == null) {
         start = this[dartx.length];
       } else if (!(typeof start == 'number')) {
-        throw new core.ArgumentError(start);
+        dart.throw(new core.ArgumentError(start));
       } else if (dart.notNull(start) < 0 || dart.notNull(start) > dart.notNull(this[dartx.length])) {
-        throw new core.RangeError.range(start, 0, this[dartx.length]);
+        dart.throw(new core.RangeError.range(start, 0, this[dartx.length]));
       }
       if (typeof pattern == 'string') {
         let other = pattern;
         if (dart.notNull(start) + dart.notNull(other[dartx.length]) > dart.notNull(this[dartx.length])) {
           start = dart.notNull(this[dartx.length]) - dart.notNull(other[dartx.length]);
         }
         return dart.as(_js_helper.stringLastIndexOfUnchecked(this, other, start), core.int);
       }
       for (let i = start; dart.notNull(i) >= 0; i = dart.notNull(i) - 1) {
         if (pattern[dartx.matchAsPrefix](this, i) != null)
           return i;
       }
       return -1;
     }
     [dartx.contains](other, startIndex) {
       if (startIndex === void 0)
         startIndex = 0;
       _js_helper.checkNull(other);
       if (dart.notNull(startIndex) < 0 || dart.notNull(startIndex) > dart.notNull(this[dartx.length])) {
-        throw new core.RangeError.range(startIndex, 0, this[dartx.length]);
+        dart.throw(new core.RangeError.range(startIndex, 0, this[dartx.length]));
       }
       return dart.as(_js_helper.stringContainsUnchecked(this, other, startIndex), core.bool);
     }
     get [dartx.isEmpty]() {
       return this[dartx.length] == 0;
     }
     get [dartx.isNotEmpty]() {
       return !dart.notNull(this[dartx.isEmpty]);
     }
     [dartx.compareTo](other) {
       if (!(typeof other == 'string'))
-        throw new core.ArgumentError(other);
+        dart.throw(new core.ArgumentError(other));
       return dart.equals(this, other) ? 0 : this < other ? -1 : 1;
     }
     toString() {
       return this;
     }
     get hashCode() {
       let hash = 0;
       for (let i = 0; dart.notNull(i) < dart.notNull(this[dartx.length]); i = dart.notNull(i) + 1) {
         hash = 536870911 & dart.notNull(hash) + this.charCodeAt(i);
         hash = 536870911 & dart.notNull(hash) + ((524287 & dart.notNull(hash)) << 10);
         hash = hash ^ hash >> 6;
       }
       hash = 536870911 & dart.notNull(hash) + ((67108863 & dart.notNull(hash)) << 3);
       hash = hash ^ hash >> 11;
       return 536870911 & dart.notNull(hash) + ((16383 & dart.notNull(hash)) << 15);
     }
     get runtimeType() {
       return core.String;
     }
     get [dartx.length]() {
       return this.length;
     }
     [dartx.get](index) {
       if (!(typeof index == 'number'))
-        throw new core.ArgumentError(index);
+        dart.throw(new core.ArgumentError(index));
       if (dart.notNull(index) >= dart.notNull(this[dartx.length]) || dart.notNull(index) < 0)
-        throw new core.RangeError.value(index);
+        dart.throw(new core.RangeError.value(index));
       return this[index];
     }
   }
   JSString[dart.implements] = () => [core.String, JSIndexable];
   dart.setSignature(JSString, {
     constructors: () => ({JSString: [JSString, []]}),
     methods: () => ({
       [dartx.codeUnitAt]: [core.int, [core.int]],
       [dartx.allMatches]: [core.Iterable$(core.Match), [core.String], [core.int]],
       [dartx.matchAsPrefix]: [core.Match, [core.String], [core.int]],
@@ skipping 132 matching lines @@
   exports.JSString = JSString;
   exports.getInterceptor = getInterceptor;
   exports.JSBool = JSBool;
   exports.JSIndexable = JSIndexable;
   exports.JSMutableIndexable = JSMutableIndexable;
   exports.JSObject = JSObject;
   exports.JavaScriptObject = JavaScriptObject;
   exports.PlainJavaScriptObject = PlainJavaScriptObject;
   exports.UnknownJavaScriptObject = UnknownJavaScriptObject;
 });