Pub partial deadlock with angular-0.13.0 transformer

[DartBot]

This issue was originally filed by @taisph

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What steps will reproduce the problem?

1. Create a basic Angular app. You can use https://github.com/taisph/angular.dart-attach-test
2. Run pub get and pub serve --port 8083.
3. Run curl http://localhost:8083/main.dart and a proper response is returned.
4. Make a change in web/main.dart and save.
5. Run curl http://localhost:8083/main.dart and curl now hangs waiting for a response.

What is the expected output? What do you see instead?
I expected to get a "Build completed successfully" message in the pub serve console and the result returned to curl after the change.

What version of the product are you using?
± pub version
Pub 1.5.3

± pub deps
angular_dart_attach_test 0.0.0
|-- angular 0.13.0
| |-- browser...
| |-- web_components...
| |-- analyzer 0.18.0
| | |-- args...
| | |-- logging...
| | |-- path...
| | '-- typed_mock 0.0.4
| |-- args 0.10.0+2
| | '-- collection...
| |-- barback 0.14.0+3
| | |-- collection...
| | |-- path...
| | |-- source_maps...
| | '-- stack_trace 0.9.3+2
| | '-- path...
| |-- code_transformers 0.1.6
| | |-- analyzer...
| | |-- barback...
| | |-- path...
| | '-- source_maps...
| |-- collection 0.9.4
| |-- di 2.0.1
| | |-- analyzer...
| | |-- barback...
| | |-- code_transformers...
| | '-- path 1.2.2
| |-- html5lib 0.10.0
| | |-- source_maps 0.9.4
| | | |-- path...
| | | '-- source_span 1.0.0
| | | '-- path...
| | '-- utf 0.9.0+1
| |-- intl 0.8.10+4
| | |-- analyzer...
| | |-- path...
| | '-- meta 0.8.8
| |-- perf_api 0.0.8
| '-- route_hierarchical 0.4.21
| |-- browser...
| '-- logging 0.9.2
|-- browser 0.10.0+2
'-- web_components 0.3.5+1

On what operating system?
Ubuntu 14.04 64-bit

Please provide any additional information below.
Issue originally raised in Angular's issue tracker but was closed stating this was a pub bug.

dart-archive/angular.dart#1276

[DartBot]

This comment was originally written by @vicb

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Note: Step 3-5 are done with pub serve running. If you terminate pub serve after the first request an re-start after right before the second request, there is no more issue.

Seems like the issue is with modifying a served file.

For some reason, it used to work with Angular 0.12 - The issue being reported is triggered on angular 0.13.

[kasperl]

Added Area-Pub, Triaged labels.

[nex3]

This is almost certainly an issue in Angular and/or code_transformers. I'll explain in more detail on the Angular bug.

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Added Invalid label.

[DartBot]

This issue has been moved to dart-lang/pub#1077.