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4698 Commits

Author SHA1 Message Date
herhut@google.com 616f2b5038 Model 'await for' as an explicit node in tree and fix its handling. 
BUG= http://dartbug.com/23119
R=floitsch@google.com, johnniwinther@google.com

Review URL: https://codereview.chromium.org//1069983005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45053 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-10 08:17:01 +00:00
sra@google.com e360f87504 Fix order of parameters in intercepted generative constructor body. 
When the receiver parameter is inserted at the front of the parameter list, some parameters may have already been inserted and others will be inserted later.
If none have already been inserted, then the subsequent parameters were being inserted in front of the receiver parameter. This is fixed by marking the receiver as the lastAddedParameter if it is the only one. This did not seem to affect 'this', presumably because the position of 'this' is immaterial since it is always removed from the JS function parameters.

R=sigmund@google.com

Review URL: https://codereview.chromium.org//1066303002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45048 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-10 03:18:05 +00:00
sra@google.com 0e68d32045 Improve error handling of JS-calls 
- Accept juxtaposed strings for JS behavior since that can now be large.
- Give proper errors rather than scary internal errors.

R=floitsch@google.com

Committed: https://code.google.com/p/dart/source/detail?r=45013

Reverted: https://code.google.com/p/dart/source/detail?r=45021

Review URL: https://codereview.chromium.org//1071853002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45022 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-09 18:20:14 +00:00
sra@google.com 9e760fde6e Improve error handling of JS-calls 
- Accept juxtaposed strings for JS behavior since that can now be large.
- Give proper errors rather than scary internal errors.

R=floitsch@google.com

Committed: https://code.google.com/p/dart/source/detail?r=45013

Review URL: https://codereview.chromium.org//1071853002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45021 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-09 18:07:45 +00:00
sra@google.com 1293347d87 Improve error handling of JS-calls 
- Accept juxtaposed strings for JS behavior since that can now be large.
- Give proper errors rather than scary internal errors.

R=floitsch@google.com

Review URL: https://codereview.chromium.org//1071853002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45013 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-09 15:55:32 +00:00
kmillikin@google.com 34fc9fb911 Refactor the try statement analysis results. 
In the dart2js CPS backend, move the frontend-specific try statement
analysis results out of the frontend-independent IrBuilder and into the
frontend-specific IrBuilderVisitor.

BUG=
R=johnniwinther@google.com

Review URL: https://codereview.chromium.org//1075923002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45009 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-09 14:17:36 +00:00
floitsch@google.com 16b03eb41e Use range-arguments to avoid sublist-iterable and sublists. 
BUG= http://dartbug.com/23142
R=lrn@google.com

Review URL: https://codereview.chromium.org//1076793002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45008 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-09 13:59:20 +00:00
kmillikin@google.com 73938235ad Propagate bailout messages from the CPS IR backends. 
If there is a bailout message, propagate it out.

BUG=
R=asgerf@google.com

Review URL: https://codereview.chromium.org//1070023002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45007 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-09 13:34:10 +00:00
asgerf@google.com 08f7ee9410 Overhaul tree IR visitor and rename IR classes. 
Changes in both IRs:
- ExecutableDefinition -> RootNode

- PassMixin has been removed and the Pass interface has been
  reduced to a single rewrite(RootNode) method.

- ConstructorDefinition no longer subclasses FunctionDefinition.

Changes in the cps IR:
- RunnableBody -> Body

Changes in tree IR:
- RootNodes have "forEachBody" and "replaceEachBody" helper methods that
  take care of the boilerplate for traversing roots and initializers.

- We now have visitors for initializers and root nodes. The RecursiveVisitor still
  just visits statements and expressions since forEachBody takes care of the root
  nodes and initializers.

- Initializers are no longer expressions. Why were they expressions?

- We now have a RecursiveTransformer class which behaves like RecursiveVisitor,
  except visitors are expected to return a transformed node.
  This removes a lot of boilerplate traversal from transformations.

R=kmillikin@google.com

Committed: https://code.google.com/p/dart/source/detail?r=45000

Reverted: https://code.google.com/p/dart/source/detail?r=45004

Review URL: https://codereview.chromium.org//1068243002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45006 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-09 13:18:53 +00:00
asgerf@google.com 115cbb06fc Overhaul tree IR visitor and rename IR classes. 
Changes in both IRs:
- ExecutableDefinition -> RootNode

- PassMixin has been removed and the Pass interface has been
  reduced to a single rewrite(RootNode) method.

- ConstructorDefinition no longer subclasses FunctionDefinition.

Changes in the cps IR:
- RunnableBody -> Body

Changes in tree IR:
- RootNodes have "forEachBody" and "replaceEachBody" helper methods that
  take care of the boilerplate for traversing roots and initializers.

- We now have visitors for initializers and root nodes. The RecursiveVisitor still
  just visits statements and expressions since forEachBody takes care of the root
  nodes and initializers.

- Initializers are no longer expressions. Why were they expressions?

- We now have a RecursiveTransformer class which behaves like RecursiveVisitor,
  except visitors are expected to return a transformed node.
  This removes a lot of boilerplate traversal from transformations.

R=kmillikin@google.com

Committed: https://code.google.com/p/dart/source/detail?r=45000

Review URL: https://codereview.chromium.org//1068243002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45004 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-09 13:00:56 +00:00
asgerf@google.com 28facdb760 Overhaul tree IR visitor and rename IR classes. 
Changes in both IRs:
- ExecutableDefinition -> RootNode

- PassMixin has been removed and the Pass interface has been
  reduced to a single rewrite(RootNode) method.

- ConstructorDefinition no longer subclasses FunctionDefinition.

Changes in the cps IR:
- RunnableBody -> Body

Changes in tree IR:
- RootNodes have "forEachBody" and "replaceEachBody" helper methods that
  take care of the boilerplate for traversing roots and initializers.

- We now have visitors for initializers and root nodes. The RecursiveVisitor still
  just visits statements and expressions since forEachBody takes care of the root
  nodes and initializers.

- Initializers are no longer expressions. Why were they expressions?

- We now have a RecursiveTransformer class which behaves like RecursiveVisitor,
  except visitors are expected to return a transformed node.
  This removes a lot of boilerplate traversal from transformations.

R=kmillikin@google.com

Review URL: https://codereview.chromium.org//1068243002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@45000 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-09 12:04:45 +00:00
johnniwinther@google.com 796c130cdc Extract CallStructure from Selector. 
This should be used for static invocation so that Selector is only for dynamic invocations.

BUG=
R=floitsch@google.com

Committed: https://code.google.com/p/dart/source/detail?r=44960

Reverted: https://code.google.com/p/dart/source/detail?r=44961

Review URL: https://codereview.chromium.org//1062913003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44991 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-09 07:44:17 +00:00
kmillikin@google.com 8ee2280e9b Change the collection of continuation jumps. 
Encapsulate the responsibility for emitting jumps and building continuation
environments in the JumpCollector class.  JumpCollectors are now used for
continuations that are not break or continue targets in the source
program (e.g., some of the loop continuations) for uniformity.

BUG=
R=asgerf@google.com

Review URL: https://codereview.chromium.org//1040093002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44964 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-08 12:49:26 +00:00
asgerf@google.com c1a29cfc2f cps-ir: Merge variables based on set-based liveness and graph coloring. 
RegisterAllocator and CopyPropagator have been removed.

Variables are merged after StatementRewriter.

This simplifies CPS->Tree translation is a little bit since the mapping
to variables is one-to-one.

The StatementRewriter has a more SSA-like input, but has to be more
aggressive when looking for a redex. It now looks through a chain of
phi-assignments to check if two statements can be combined, whereas
before it would only combine two identical jumps.

I haven't been able to measure a significant slowdown, though I'm sure
it is at least a little bit slower.

R=kmillikin@google.com

Review URL: https://codereview.chromium.org//1007103003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44962 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-08 10:59:22 +00:00
johnniwinther@google.com 2d39371869 Revert "Extract CallStructure from Selector." 
This reverts commit r44960.

BUG=

Review URL: https://codereview.chromium.org//1068233002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44961 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-08 10:38:28 +00:00
johnniwinther@google.com 296d174559 Extract CallStructure from Selector. 
This should be used for static invocation so that Selector is only for dynamic invocations.

BUG=
R=floitsch@google.com

Review URL: https://codereview.chromium.org//1062913003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44960 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-08 09:30:50 +00:00
johnniwinther@google.com 1844b7e4ae Fix bug in native/behavior.dart 
BUG=

Review URL: https://codereview.chromium.org//1069263003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44959 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-08 08:47:57 +00:00
johnniwinther@google.com 1098ce385c Handle unexpected tokens in modifier lists. 
BUG=http://dartbug.com/23051
R=floitsch@google.com

Review URL: https://codereview.chromium.org//1067653003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44958 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-08 08:11:12 +00:00
sra@google.com 56076c00da Parse more properties of native code fragments. 
';' is now a separator rather than a terminator.

Add properties for:
- throwing behaviour
- allocation (fresh unaliased object)
- gvn

These are currently unused.
I have a separate CL in preparation with a better throwing behaviour

R=floitsch@google.com

Review URL: https://codereview.chromium.org//1034263002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44947 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-07 20:53:41 +00:00
sigurdm@google.com f328d3f997 Fix bug in dart2js async rewrite 
In some cases where a transform of yield and await was not needed, the old nodes were reused - instead they should have been visited to
allow renaming and rewrite of `this`.

BUG= dartbug.com/23058
R=floitsch@google.com

Review URL: https://codereview.chromium.org//1060293002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44933 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-07 12:06:46 +00:00
sra@google.com 206671dfb7 Add 'toString' method to NativeBehavior 
TBR=floitsch@google.com

Review URL: https://codereview.chromium.org//1053053003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44869 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-02 20:15:27 +00:00
sra@google.com c7e5344b9f "Redo "Avoid getInterceptor calls in cases were the interceptor would be constant if it were not null." agains. 
TBR=floitsch@google.com

Review URL: https://codereview.chromium.org//1058433003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44858 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-02 02:59:47 +00:00
sra@google.com 9456ce82b5 Revert "Redo "Avoid getInterceptor calls in cases were the interceptor would be constant if it were not null."" 
Will delete unused API.

TBR=floitsch@google.com
BUG=

Review URL: https://codereview.chromium.org//1050363002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44857 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-02 02:49:53 +00:00
sra@google.com d4a1b47e98 Redo "Avoid getInterceptor calls in cases were the interceptor would be constant if it were not null." 
TBR=floitsch@google.com
BUG=

Review URL: https://codereview.chromium.org//1057753002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44856 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-02 01:44:05 +00:00
sra@google.com b1315659b5 Revert "Avoid getInterceptor calls in cases were the interceptor would be constant if it were not null." 
TBR=floitsch@google.com
BUG=

Review URL: https://codereview.chromium.org//1050343002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44855 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-02 01:33:08 +00:00
sra@google.com c96493e219 Avoid getInterceptor calls in cases were the interceptor would be constant if it were not null. 
Example:

    gap = J.getInterceptor$x(style).get$columnGap(style);
-->
    gap = (style && C.CssStyleDeclaration_methods).get$columnGap(style);

R=floitsch@google.com

Review URL: https://codereview.chromium.org//1031633003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44853 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-02 00:59:25 +00:00
herhut@google.com 557d7f5ec9 Also intialize methods inherited from mixin classes. 
BUG= http://dartbug.com/23056
R=zarah@google.com, floitsch@google.com, sra@google.com

Review URL: https://codereview.chromium.org//1057513002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44832 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-01 13:15:01 +00:00
zarah@google.com db854e1148 dart2js: emit info on lazy fields in array. 
R=herhut@google.com

Review URL: https://codereview.chromium.org//999933007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44830 260f80e4-7a28-3924-810f-c04153c831b5
 2015-04-01 11:07:34 +00:00
het@google.com 7f97883c8d Emit diagnostics for bad NSM implementations 
BUG=
R=sra@google.com

Review URL: https://codereview.chromium.org//1023673012

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44808 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-31 17:11:26 +00:00
johnniwinther@google.com 8cd443241a Handle NewExpression in SemanticSendVisitor. 
BUG=
R=floitsch@google.com

Review URL: https://codereview.chromium.org//1043723002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44800 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-31 10:02:55 +00:00
herhut@google.com 32a9974aef Do not include names of lazy globals in minified mode. 
BUG=
R=zarah@google.com

Review URL: https://codereview.chromium.org//1022103002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44777 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-30 10:36:31 +00:00
zarah@google.com 14836d31f2 dart2js: remove first argument from lazy function. 
R=herhut@google.com

Committed: https://code.google.com/p/dart/source/detail?r=44660

Reverted: https://code.google.com/p/dart/source/detail?r=44665

Review URL: https://codereview.chromium.org//1029003002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44776 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-30 08:19:27 +00:00
herhut@google.com faa03376b4 Clean up naming scheme for reflection names. 
BUG= http://dartbug.com/22987
R=ahe@google.com

Committed: https://code.google.com/p/dart/source/detail?r=44732

Reverted: https://code.google.com/p/dart/source/detail?r=44733

Review URL: https://codereview.chromium.org//1040623002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44736 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-27 14:43:02 +00:00
karlklose@google.com ce95110c52 Change type annotation buildInvokeConstructorInvocation. 
The Dart backend uses the type directly to reconstruct malformed constructor calls and the JavaScript backend will generate code to throw an exception when encountering an ErroneousElement as target.

R=asgerf@google.com

Review URL: https://codereview.chromium.org//1036263002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44735 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-27 14:11:49 +00:00
herhut@google.com 363b144eae Revert "Clean up naming scheme for reflection names." 
This reverts commit r44732.

BUG=
TBR=ahe@google.com

Review URL: https://codereview.chromium.org//1039223002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44733 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-27 13:38:50 +00:00
herhut@google.com 7719901f37 Clean up naming scheme for reflection names. 
BUG= http://dartbug.com/22987
R=ahe@google.com

Review URL: https://codereview.chromium.org//1040623002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44732 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-27 12:28:04 +00:00
herhut@google.com 7bb03d31d9 Move set-membership based containment test behind a flag. 
BUG=
R=karlklose@google.com

Review URL: https://codereview.chromium.org//1037223002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44731 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-27 10:54:57 +00:00
johnniwinther@google.com 726265c92c Fix type annotation for deferred constants. 
BUG=
R=sigurdm@google.com

Review URL: https://codereview.chromium.org//1033213002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44730 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-27 10:26:47 +00:00
sra@google.com d216759d16 Fix printing of HConstant 
Avoid the assert in ConstantValue.toString()

BUG=

Review URL: https://codereview.chromium.org//1036873004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44715 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-26 17:52:14 +00:00
johnniwinther@google.com db93e02d2c Implement ResolvedVisitor using SemanticSendVisitor. 
BUG=
R=karlklose@google.com

Review URL: https://codereview.chromium.org//1030103004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44711 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-26 14:49:24 +00:00
karlklose@google.com 43e52e2162 cps-ir: Set runtime type information for new objects that require it. 
R=asgerf@google.com

Review URL: https://codereview.chromium.org//1011403003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44708 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-26 10:27:32 +00:00
floitsch@google.com 14ddfb7aac dart2js: Optimize Function.apply for 0-3 argument calls. 
R=sra@google.com

Review URL: https://codereview.chromium.org//1032013002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44704 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-25 23:21:23 +00:00
sra@google.com ab8f0bb4ec dart2js: permit generation of conditionals as arguments of allocations. 
Example:

    t1 = onError == null ? 1 : 3;
    this._addListener$1(new P._FutureListener(null, result, t1, f, onError));
-->
    this._addListener$1(new P._FutureListener(null, result, onError == null ? 1 : 3, f, onError));

R=herhut@google.com

Review URL: https://codereview.chromium.org//1031993002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44696 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-25 20:18:29 +00:00
sigurdm@google.com 2008f189ad Rename the inner function of async functions. 
Before they were all named `body`, now they have the same name as their
enclosing function.

BUG= dartbug.com/22942
R=floitsch@google.com

Review URL: https://codereview.chromium.org//1018393003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44682 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-25 12:37:47 +00:00
zarah@google.com bb0a3b8216 dart2js: rename and refactor reflection_data_parser. 
This change does not affect the generated output.

R=herhut@google.com

Review URL: https://codereview.chromium.org//1024523003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44681 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-25 08:50:43 +00:00
het@google.com 790d5e3ae4 Fix check for throwing NSM implementations. 
BUG=
R=sra@google.com

Review URL: https://codereview.chromium.org//1005873009

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44678 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-25 01:01:28 +00:00
zarah@google.com 3e7cb1ca3d Revert "dart2js: remove first argument from lazy function." 
This reverts commit r44660.

BUG=

Review URL: https://codereview.chromium.org//1026353002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44665 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-24 13:39:58 +00:00
herhut@google.com 3644473d58 Remove NSM if followed by a foreign with same effect. 
BUG=
R=floitsch@google.com, sra@google.com

Committed: https://code.google.com/p/dart/source/detail?r=44661

Reverted: https://code.google.com/p/dart/source/detail?r=44662

Review URL: https://codereview.chromium.org//1010433004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44663 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-24 12:30:10 +00:00
herhut@google.com 6c456f3faa Revert "Remove NSM if followed by a foreign with same effect." 
This reverts revision 44661.

BUG=
TBR=karlklose@google.com

Review URL: https://codereview.chromium.org//1026333002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44662 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-24 12:04:40 +00:00
herhut@google.com 06f7b5aa13 Remove NSM if followed by a foreign with same effect. 
BUG=
R=floitsch@google.com, sra@google.com

Review URL: https://codereview.chromium.org//1010433004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44661 260f80e4-7a28-3924-810f-c04153c831b5
 2015-03-24 11:32:28 +00:00