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I BET IT IS THIS ONE => red squiggles on valid code <= I BET IT IS THIS ONE #673
This is a gather-all ticket.
Basically we are relying on the scala compiler's interactive mode, also known as the presentation compiler. It is known to have loads of corner case problems and unfortunately these manifest themselves as false positives in ENSIME.
The best thing you can do is report a ticket at https://issues.scala-lang.org/ with a minimal failure case as per http://scala-ide.org/docs/dev/testing/presentation-compiler-tests.html or consider investigating further and submitting a fix via https://github.com/typelevel/scala
If the problem arises from a macro or compiler plugin (e.g. shapeless), you may wish to get involved with the workaround discussed at https://github.com/fommil/imaginary-friend