diff options
Diffstat (limited to 'test/files/neg/lub-from-hell-2.scala')
| -rw-r--r-- | test/files/neg/lub-from-hell-2.scala | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/test/files/neg/lub-from-hell-2.scala b/test/files/neg/lub-from-hell-2.scala index 96760c6edf..18c99dfada 100644 --- a/test/files/neg/lub-from-hell-2.scala +++ b/test/files/neg/lub-from-hell-2.scala @@ -4,3 +4,10 @@ class Test { def bar(a: Boolean, b: scala.collection.mutable.SetLike[Any,scala.collection.mutable.Set[Any]], c: scala.collection.mutable.Buffer[Any]) = if (a) b else c // bar produces an ill-bounded LUB in 2.11.8. After this commit, which fixes a bug in existential+refinement lubs, foo also fails. } +// This test case minimizes a case that stated to fail compile after my fixes in SI-5294. +// `foo` used to compile for the wrong reason, `mergePrefixAndArgs` failed to transpose a +// ragged matrix and skipped to the next level of the base type sequences to find a common type symbol. +// +// My changes fixed the root cause of the ragged matrix, which uncovered the latent bug. +// For comparison, `bar` failed to compile before _and_ after my changes for the same reason: +// f-bounded types involved in LUBs can sometimes produce an ill-bounded LUB. |