Spurious warning for "classes will overwrite one another on case-insensitive filesystems"

[allanrenucci]

package foo {
  class Hello
}

package bar {
  class Hello
}

-- Warning: tests/allan/Test.scala:23:8 ----------------------------------------
23 |  class Hello
   |        ^
   |Class Hello differs only in case from Hello. Such classes will overwrite one another on case-insensitive filesystems.
one warning found