scala/scala — pull request #1659 by retronym (2012-11-22 13:36:12+00:00)
Title: SI-6667 Abort after any ambiguous in-scope implicit

Rather than continuing on to a search of implicits
of the expected type, which used to happen if
the caller was running the implicit search in silent
mode.

I've discussed the change with @odersky.

Review of the implementation by @adriaanm

/cc @xeno-by: Note that tag generation is also now
uniformly suppressed after any ambiguity error.