I just tried this with the Karma setup. This fails Traceur compilation and does not even run the tests. The output shows line numbers and errors:

INFO [watcher]: Changed file "/Users/vojta/Code/angular/modules/core/src/compiler/compiler.js".
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:11:24: Unexpected token templateLoader
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:11:38: Unexpected token )
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:20: Unexpected token :
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:21: Semi-colon expected
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:34: Semi-colon expected
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:34: Unexpected token :
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:35: Semi-colon expected
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:53: Semi-colon expected
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:53: Unexpected token )
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:54: Semi-colon expected
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:54: Unexpected token :
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:55: Semi-colon expected
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:78: Semi-colon expected
ERROR [traceur]: /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:29:1: Unexpected token End of File
Chrome 40.0.2210 (Mac OS X 10.9.5) ERROR
  TEST RUN WAS CANCELLED because this file contains some errors:
    /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js

I also improved the way gulp shows the errors (see 7d0a83a). Now it looks like this:

Error: gulp-traceur:
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:11:24: Unexpected token templateLoader
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:11:38: Unexpected token )
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:20: Unexpected token :
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:21: Semi-colon expected
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:34: Semi-colon expected
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:34: Unexpected token :
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:35: Semi-colon expected
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:53: Semi-colon expected
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:53: Unexpected token )
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:54: Semi-colon expected
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:54: Unexpected token :
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:55: Semi-colon expected
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:23:78: Semi-colon expected
  /Users/vojta/Code/angular/modules/core/src/compiler/compiler.js:29:1: Unexpected token End of File

Please re-open if you have any suggestions how to make it better.

transpiler: show line numbers that have errors #1

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