It turns out that I was using Java 8, which is not compatible with the current version of Scala 2.11.4 as of this post. This messes up the compiler and yields false positive everywhere, and package suggestion is also affected.
I removed Java 8, and then install Java 7. Now Eclipse is happy with Scala.
It turns out that I was using Java 8, which is not compatible with the current version of Scala 2.11.4 as of this post. This messes up the compiler and yields false positive everywhere, and package suggestion is also affected.
I removed Java 8, and then install Java 7. Now Eclipse is happy with Scala.