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author | Jason Zaugg <jzaugg@gmail.com> | 2013-11-22 16:28:51 +0100 |
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committer | Jason Zaugg <jzaugg@gmail.com> | 2013-11-23 09:36:16 +0100 |
commit | 518635385ac1ba14aa230de3e431793331300546 (patch) | |
tree | 0f59b8af02591bddf711ecc485623432313510f0 /test/files/neg/t7872b.check | |
parent | c243435f113615b2f7407fbd683c93ec16c73749 (diff) | |
download | scala-518635385ac1ba14aa230de3e431793331300546.tar.gz scala-518635385ac1ba14aa230de3e431793331300546.tar.bz2 scala-518635385ac1ba14aa230de3e431793331300546.zip |
SI-7872 Plug a variance exploit in refinement types
Refinement types are collapsed to a TypeTree with an original
during type checking; this was enough to evade variance validation
in refchecks.
This commit:
- validates the original of `TypeTree`s in refchecks
- changes VarianceValidator to recurse into:
- the originals of `TypeTree`s
- `TypTree` (to cover, e.g. `CompoundTypeTree` / `SelectFromTypeTree`)
It also finds an unreported variance violation in an existing
test case, variances.scala. This looks to be legitimate.
Diffstat (limited to 'test/files/neg/t7872b.check')
-rw-r--r-- | test/files/neg/t7872b.check | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/test/files/neg/t7872b.check b/test/files/neg/t7872b.check new file mode 100644 index 0000000000..0dc4e76301 --- /dev/null +++ b/test/files/neg/t7872b.check @@ -0,0 +1,7 @@ +t7872b.scala:8: error: contravariant type a occurs in covariant position in type [-a]List[a] of type l + def oops1 = down[({type l[-a] = List[a]})#l](List('whatever: Object)).head + "oops" + ^ +t7872b.scala:19: error: covariant type a occurs in contravariant position in type [+a]coinv.Stringer[a] of type l + def oops2 = up[({type l[+a] = Stringer[a]})#l]("printed: " + _) + ^ +two errors found |