Boosted test coverage.

5 files changed, 601 insertions, 0 deletions

diff --git a/test/files/neg/variances-refinement.check b/test/files/neg/variances-refinement.check
new file mode 100644
index 0000000000..2bed3ffa6b
--- /dev/null
+++ b/test/files/neg/variances-refinement.check
@@ -0,0 +1,22 @@
+variances-refinement.scala:17: error: contravariant type A occurs in covariant position in type ()AnyRef{def f0(x: A): A} of method fail1
+  def fail1() = { object O { def f0(x: A): A = ??? } ; O } // fail
+      ^
+variances-refinement.scala:18: error: covariant type B occurs in contravariant position in type ()AnyRef{def f0(x: B): A} of method fail2
+  def fail2() = { object O { def f0(x: B): A = ??? } ; O } // fail
+      ^
+variances-refinement.scala:19: error: covariant type B occurs in contravariant position in type ()AnyRef{def f0(x: B): B} of method fail3
+  def fail3() = { object O { def f0(x: B): B = ??? } ; O } // fail
+      ^
+variances-refinement.scala:20: error: covariant type B occurs in contravariant position in type ()AnyRef{def f0(x: B): C} of method fail4
+  def fail4() = { object O { def f0(x: B): C = ??? } ; O } // fail
+      ^
+variances-refinement.scala:21: error: contravariant type A occurs in covariant position in type ()AnyRef{def f0(x: C): A} of method fail5
+  def fail5() = { object O { def f0(x: C): A = ??? } ; O } // fail
+      ^
+variances-refinement.scala:23: error: contravariant type A occurs in covariant position in type ()O1.type forSome { val O1: AnyRef with O0; type O0 <: AnyRef{def f0(x: A): A; def f1(x: A): B; def f2(x: A): C} } of method fail6
+  def fail6() = { // fail
+      ^
+variances-refinement.scala:32: error: contravariant type A occurs in covariant position in type ()AnyRef{def f0(x: A): A; def f1(x: A): B; def f2(x: A): C} of method fail7
+  def fail7() = { // fail
+      ^
+7 errors found
diff --git a/test/files/neg/variances-refinement.scala b/test/files/neg/variances-refinement.scala
new file mode 100644
index 0000000000..6bfd336ce0
--- /dev/null
+++ b/test/files/neg/variances-refinement.scala
@@ -0,0 +1,40 @@
+trait Trait[-A, +B, C] {
+  def ok() = { // ok
+    object O {
+      private def f0(x: A): A = ???
+      def f1(x: A): B = ???
+      def f2(x: A): C = ???
+      private def f3(x: B): A = ???
+      private def f4(x: B): B = ???
+      private def f5(x: B): C = ???
+      private def f6(x: C): A = ???
+      def f7(x: C): B = ???
+      def f8(x: C): C = ???
+    }
+    O
+  }
+
+  def fail1() = { object O { def f0(x: A): A = ??? } ; O } // fail
+  def fail2() = { object O { def f0(x: B): A = ??? } ; O } // fail
+  def fail3() = { object O { def f0(x: B): B = ??? } ; O } // fail
+  def fail4() = { object O { def f0(x: B): C = ??? } ; O } // fail
+  def fail5() = { object O { def f0(x: C): A = ??? } ; O } // fail
+
+  def fail6() = { // fail
+    trait O0 {
+      def f0(x: A): A = ???
+      def f1(x: A): B = ???
+      def f2(x: A): C = ???
+    }
+    object O1 extends O0
+    O1
+  }
+  def fail7() = { // fail
+    trait O0 {
+      def f0(x: A): A = ???
+      def f1(x: A): B = ???
+      def f2(x: A): C = ???
+    }
+    new O0 { }
+  }
+}
diff --git a/test/files/neg/variances2.check b/test/files/neg/variances2.check
new file mode 100644
index 0000000000..433cc125ad
--- /dev/null
+++ b/test/files/neg/variances2.check
@@ -0,0 +1,229 @@
+variances2.scala:9: error: covariant type B occurs in contravariant position in type B of value x
+    def f1(x: B): Unit = ()
+           ^
+variances2.scala:12: error: covariant type E occurs in contravariant position in type E of value x
+    def f4(x: E): Unit = ()
+           ^
+variances2.scala:15: error: contravariant type A occurs in covariant position in type ()A of method f6
+    def f6(): A = ???
+        ^
+variances2.scala:18: error: contravariant type D occurs in covariant position in type ()D of method f9
+    def f9(): D = ???
+        ^
+variances2.scala:22: error: contravariant type A occurs in covariant position in type A => A of value f
+    def f12(f: A => A): Unit = ()
+            ^
+variances2.scala:23: error: contravariant type A occurs in covariant position in type A => B of value f
+    def f13(f: A => B): Unit = ()
+            ^
+variances2.scala:24: error: contravariant type A occurs in covariant position in type A => C of value f
+    def f14(f: A => C): Unit = ()
+            ^
+variances2.scala:25: error: contravariant type A occurs in covariant position in type A => D of value f
+    def f15(f: A => D): Unit = ()
+            ^
+variances2.scala:26: error: contravariant type A occurs in covariant position in type A => E of value f
+    def f16(f: A => E): Unit = ()
+            ^
+variances2.scala:27: error: contravariant type A occurs in covariant position in type A => F of value f
+    def f17(f: A => F): Unit = ()
+            ^
+variances2.scala:29: error: covariant type B occurs in contravariant position in type B => B of value f
+    def f19(f: B => B): Unit = ()
+            ^
+variances2.scala:32: error: covariant type E occurs in contravariant position in type B => E of value f
+    def f22(f: B => E): Unit = ()
+            ^
+variances2.scala:35: error: covariant type B occurs in contravariant position in type C => B of value f
+    def f25(f: C => B): Unit = ()
+            ^
+variances2.scala:38: error: covariant type E occurs in contravariant position in type C => E of value f
+    def f28(f: C => E): Unit = ()
+            ^
+variances2.scala:40: error: contravariant type D occurs in covariant position in type D => A of value f
+    def f30(f: D => A): Unit = ()
+            ^
+variances2.scala:41: error: contravariant type D occurs in covariant position in type D => B of value f
+    def f31(f: D => B): Unit = ()
+            ^
+variances2.scala:42: error: contravariant type D occurs in covariant position in type D => C of value f
+    def f32(f: D => C): Unit = ()
+            ^
+variances2.scala:43: error: contravariant type D occurs in covariant position in type D => D of value f
+    def f33(f: D => D): Unit = ()
+            ^
+variances2.scala:44: error: contravariant type D occurs in covariant position in type D => E of value f
+    def f34(f: D => E): Unit = ()
+            ^
+variances2.scala:45: error: contravariant type D occurs in covariant position in type D => F of value f
+    def f35(f: D => F): Unit = ()
+            ^
+variances2.scala:47: error: covariant type B occurs in contravariant position in type E => B of value f
+    def f37(f: E => B): Unit = ()
+            ^
+variances2.scala:50: error: covariant type E occurs in contravariant position in type E => E of value f
+    def f40(f: E => E): Unit = ()
+            ^
+variances2.scala:53: error: covariant type B occurs in contravariant position in type F => B of value f
+    def f43(f: F => B): Unit = ()
+            ^
+variances2.scala:56: error: covariant type E occurs in contravariant position in type F => E of value f
+    def f46(f: F => E): Unit = ()
+            ^
+variances2.scala:59: error: contravariant type A occurs in covariant position in type ()A => A of method f48
+    def f48(): A => A = null
+        ^
+variances2.scala:62: error: contravariant type D occurs in covariant position in type ()A => D of method f51
+    def f51(): A => D = null
+        ^
+variances2.scala:65: error: covariant type B occurs in contravariant position in type ()B => A of method f54
+    def f54(): B => A = null
+        ^
+variances2.scala:66: error: covariant type B occurs in contravariant position in type ()B => B of method f55
+    def f55(): B => B = null
+        ^
+variances2.scala:67: error: covariant type B occurs in contravariant position in type ()B => C of method f56
+    def f56(): B => C = null
+        ^
+variances2.scala:68: error: covariant type B occurs in contravariant position in type ()B => D of method f57
+    def f57(): B => D = null
+        ^
+variances2.scala:69: error: covariant type B occurs in contravariant position in type ()B => E of method f58
+    def f58(): B => E = null
+        ^
+variances2.scala:70: error: covariant type B occurs in contravariant position in type ()B => F of method f59
+    def f59(): B => F = null
+        ^
+variances2.scala:71: error: contravariant type A occurs in covariant position in type ()C => A of method f60
+    def f60(): C => A = null
+        ^
+variances2.scala:74: error: contravariant type D occurs in covariant position in type ()C => D of method f63
+    def f63(): C => D = null
+        ^
+variances2.scala:77: error: contravariant type A occurs in covariant position in type ()D => A of method f66
+    def f66(): D => A = null
+        ^
+variances2.scala:80: error: contravariant type D occurs in covariant position in type ()D => D of method f69
+    def f69(): D => D = null
+        ^
+variances2.scala:83: error: covariant type E occurs in contravariant position in type ()E => A of method f72
+    def f72(): E => A = null
+        ^
+variances2.scala:84: error: covariant type E occurs in contravariant position in type ()E => B of method f73
+    def f73(): E => B = null
+        ^
+variances2.scala:85: error: covariant type E occurs in contravariant position in type ()E => C of method f74
+    def f74(): E => C = null
+        ^
+variances2.scala:86: error: covariant type E occurs in contravariant position in type ()E => D of method f75
+    def f75(): E => D = null
+        ^
+variances2.scala:87: error: covariant type E occurs in contravariant position in type ()E => E of method f76
+    def f76(): E => E = null
+        ^
+variances2.scala:88: error: covariant type E occurs in contravariant position in type ()E => F of method f77
+    def f77(): E => F = null
+        ^
+variances2.scala:89: error: contravariant type A occurs in covariant position in type ()F => A of method f78
+    def f78(): F => A = null
+        ^
+variances2.scala:92: error: contravariant type D occurs in covariant position in type ()F => D of method f81
+    def f81(): F => D = null
+        ^
+variances2.scala:96: error: contravariant type A occurs in covariant position in type (x: A)A of method f84
+    def f84(x: A): A = ???
+        ^
+variances2.scala:99: error: contravariant type D occurs in covariant position in type (x: A)D of method f87
+    def f87(x: A): D = ???
+        ^
+variances2.scala:102: error: contravariant type A occurs in covariant position in type (x: B)A of method f90
+    def f90(x: B): A = ???
+        ^
+variances2.scala:102: error: covariant type B occurs in contravariant position in type B of value x
+    def f90(x: B): A = ???
+            ^
+variances2.scala:103: error: covariant type B occurs in contravariant position in type B of value x
+    def f91(x: B): B = ???
+            ^
+variances2.scala:104: error: covariant type B occurs in contravariant position in type B of value x
+    def f92(x: B): C = ???
+            ^
+variances2.scala:105: error: contravariant type D occurs in covariant position in type (x: B)D of method f93
+    def f93(x: B): D = ???
+        ^
+variances2.scala:105: error: covariant type B occurs in contravariant position in type B of value x
+    def f93(x: B): D = ???
+            ^
+variances2.scala:106: error: covariant type B occurs in contravariant position in type B of value x
+    def f94(x: B): E = ???
+            ^
+variances2.scala:107: error: covariant type B occurs in contravariant position in type B of value x
+    def f95(x: B): F = ???
+            ^
+variances2.scala:108: error: contravariant type A occurs in covariant position in type (x: C)A of method f96
+    def f96(x: C): A = ???
+        ^
+variances2.scala:111: error: contravariant type D occurs in covariant position in type (x: C)D of method f99
+    def f99(x: C): D = ???
+        ^
+variances2.scala:114: error: contravariant type A occurs in covariant position in type (x: D)A of method f102
+    def f102(x: D): A = ???
+        ^
+variances2.scala:117: error: contravariant type D occurs in covariant position in type (x: D)D of method f105
+    def f105(x: D): D = ???
+        ^
+variances2.scala:120: error: contravariant type A occurs in covariant position in type (x: E)A of method f108
+    def f108(x: E): A = ???
+        ^
+variances2.scala:120: error: covariant type E occurs in contravariant position in type E of value x
+    def f108(x: E): A = ???
+             ^
+variances2.scala:121: error: covariant type E occurs in contravariant position in type E of value x
+    def f109(x: E): B = ???
+             ^
+variances2.scala:122: error: covariant type E occurs in contravariant position in type E of value x
+    def f110(x: E): C = ???
+             ^
+variances2.scala:123: error: contravariant type D occurs in covariant position in type (x: E)D of method f111
+    def f111(x: E): D = ???
+        ^
+variances2.scala:123: error: covariant type E occurs in contravariant position in type E of value x
+    def f111(x: E): D = ???
+             ^
+variances2.scala:124: error: covariant type E occurs in contravariant position in type E of value x
+    def f112(x: E): E = ???
+             ^
+variances2.scala:125: error: covariant type E occurs in contravariant position in type E of value x
+    def f113(x: E): F = ???
+             ^
+variances2.scala:126: error: contravariant type A occurs in covariant position in type (x: F)A of method f114
+    def f114(x: F): A = ???
+        ^
+variances2.scala:129: error: contravariant type D occurs in covariant position in type (x: F)D of method f117
+    def f117(x: F): D = ???
+        ^
+variances2.scala:133: error: contravariant type A occurs in covariant position in supertype Cov[A] of object O1
+    object O1 extends Cov[A]
+           ^
+variances2.scala:136: error: contravariant type D occurs in covariant position in supertype Cov[D] of object O4
+    object O4 extends Cov[D]
+           ^
+variances2.scala:140: error: covariant type B occurs in contravariant position in supertype Con[B] of object O8
+    object O8 extends Con[B]
+           ^
+variances2.scala:143: error: covariant type E occurs in contravariant position in supertype Con[E] of object O11
+    object O11 extends Con[E]
+           ^
+variances2.scala:145: error: contravariant type A occurs in invariant position in supertype Inv[A] of object O13
+    object O13 extends Inv[A]
+           ^
+variances2.scala:146: error: covariant type B occurs in invariant position in supertype Inv[B] of object O14
+    object O14 extends Inv[B]
+           ^
+variances2.scala:148: error: contravariant type D occurs in invariant position in supertype Inv[D] of object O16
+    object O16 extends Inv[D]
+           ^
+variances2.scala:149: error: covariant type E occurs in invariant position in supertype Inv[E] of object O17
+    object O17 extends Inv[E]
+           ^
+76 errors found
diff --git a/test/files/neg/variances2.scala b/test/files/neg/variances2.scala
new file mode 100644
index 0000000000..d30345dd83
--- /dev/null
+++ b/test/files/neg/variances2.scala
@@ -0,0 +1,303 @@
+trait Cov[+A]
+trait Con[-A]
+trait Inv[A]
+
+trait Trait[-A, +B, C] {
+  // trait Inner[-D <: C, +E >: C, F] {
+  trait Inner[-D <: C, +E >: C, F] {
+    def f0(x: A): Unit = ()
+    def f1(x: B): Unit = ()
+    def f2(x: C): Unit = ()
+    def f3(x: D): Unit = ()
+    def f4(x: E): Unit = ()
+    def f5(x: F): Unit = ()
+
+    def f6(): A = ???
+    def f7(): B = ???
+    def f8(): C = ???
+    def f9(): D = ???
+    def f10(): E = ???
+    def f11(): F = ???
+
+    def f12(f: A => A): Unit = ()
+    def f13(f: A => B): Unit = ()
+    def f14(f: A => C): Unit = ()
+    def f15(f: A => D): Unit = ()
+    def f16(f: A => E): Unit = ()
+    def f17(f: A => F): Unit = ()
+    def f18(f: B => A): Unit = ()
+    def f19(f: B => B): Unit = ()
+    def f20(f: B => C): Unit = ()
+    def f21(f: B => D): Unit = ()
+    def f22(f: B => E): Unit = ()
+    def f23(f: B => F): Unit = ()
+    def f24(f: C => A): Unit = ()
+    def f25(f: C => B): Unit = ()
+    def f26(f: C => C): Unit = ()
+    def f27(f: C => D): Unit = ()
+    def f28(f: C => E): Unit = ()
+    def f29(f: C => F): Unit = ()
+    def f30(f: D => A): Unit = ()
+    def f31(f: D => B): Unit = ()
+    def f32(f: D => C): Unit = ()
+    def f33(f: D => D): Unit = ()
+    def f34(f: D => E): Unit = ()
+    def f35(f: D => F): Unit = ()
+    def f36(f: E => A): Unit = ()
+    def f37(f: E => B): Unit = ()
+    def f38(f: E => C): Unit = ()
+    def f39(f: E => D): Unit = ()
+    def f40(f: E => E): Unit = ()
+    def f41(f: E => F): Unit = ()
+    def f42(f: F => A): Unit = ()
+    def f43(f: F => B): Unit = ()
+    def f44(f: F => C): Unit = ()
+    def f45(f: F => D): Unit = ()
+    def f46(f: F => E): Unit = ()
+    def f47(f: F => F): Unit = ()
+
+    def f48(): A => A = null
+    def f49(): A => B = null
+    def f50(): A => C = null
+    def f51(): A => D = null
+    def f52(): A => E = null
+    def f53(): A => F = null
+    def f54(): B => A = null
+    def f55(): B => B = null
+    def f56(): B => C = null
+    def f57(): B => D = null
+    def f58(): B => E = null
+    def f59(): B => F = null
+    def f60(): C => A = null
+    def f61(): C => B = null
+    def f62(): C => C = null
+    def f63(): C => D = null
+    def f64(): C => E = null
+    def f65(): C => F = null
+    def f66(): D => A = null
+    def f67(): D => B = null
+    def f68(): D => C = null
+    def f69(): D => D = null
+    def f70(): D => E = null
+    def f71(): D => F = null
+    def f72(): E => A = null
+    def f73(): E => B = null
+    def f74(): E => C = null
+    def f75(): E => D = null
+    def f76(): E => E = null
+    def f77(): E => F = null
+    def f78(): F => A = null
+    def f79(): F => B = null
+    def f80(): F => C = null
+    def f81(): F => D = null
+    def f82(): F => E = null
+    def f83(): F => F = null
+
+    def f84(x: A): A = ???
+    def f85(x: A): B = ???
+    def f86(x: A): C = ???
+    def f87(x: A): D = ???
+    def f88(x: A): E = ???
+    def f89(x: A): F = ???
+    def f90(x: B): A = ???
+    def f91(x: B): B = ???
+    def f92(x: B): C = ???
+    def f93(x: B): D = ???
+    def f94(x: B): E = ???
+    def f95(x: B): F = ???
+    def f96(x: C): A = ???
+    def f97(x: C): B = ???
+    def f98(x: C): C = ???
+    def f99(x: C): D = ???
+    def f100(x: C): E = ???
+    def f101(x: C): F = ???
+    def f102(x: D): A = ???
+    def f103(x: D): B = ???
+    def f104(x: D): C = ???
+    def f105(x: D): D = ???
+    def f106(x: D): E = ???
+    def f107(x: D): F = ???
+    def f108(x: E): A = ???
+    def f109(x: E): B = ???
+    def f110(x: E): C = ???
+    def f111(x: E): D = ???
+    def f112(x: E): E = ???
+    def f113(x: E): F = ???
+    def f114(x: F): A = ???
+    def f115(x: F): B = ???
+    def f116(x: F): C = ???
+    def f117(x: F): D = ???
+    def f118(x: F): E = ???
+    def f119(x: F): F = ???
+
+    object O1 extends Cov[A]
+    object O2 extends Cov[B]
+    object O3 extends Cov[C]
+    object O4 extends Cov[D]
+    object O5 extends Cov[E]
+    object O6 extends Cov[F]
+    object O7 extends Con[A]
+    object O8 extends Con[B]
+    object O9 extends Con[C]
+    object O10 extends Con[D]
+    object O11 extends Con[E]
+    object O12 extends Con[F]
+    object O13 extends Inv[A]
+    object O14 extends Inv[B]
+    object O15 extends Inv[C]
+    object O16 extends Inv[D]
+    object O17 extends Inv[E]
+    object O18 extends Inv[F]
+  }
+}
+
+trait Trait2[-A, +B, C] {
+  // trait Inner[-D <: C, +E >: C, F] {
+  def method[D <: A, E >: B, F]() {
+    def f0(x: A): Unit = ()
+    def f1(x: B): Unit = ()
+    def f2(x: C): Unit = ()
+    def f3(x: D): Unit = ()
+    def f4(x: E): Unit = ()
+    def f5(x: F): Unit = ()
+
+    def f6(): A = ???
+    def f7(): B = ???
+    def f8(): C = ???
+    def f9(): D = ???
+    def f10(): E = ???
+    def f11(): F = ???
+
+    def f12(f: A => A): Unit = ()
+    def f13(f: A => B): Unit = ()
+    def f14(f: A => C): Unit = ()
+    def f15(f: A => D): Unit = ()
+    def f16(f: A => E): Unit = ()
+    def f17(f: A => F): Unit = ()
+    def f18(f: B => A): Unit = ()
+    def f19(f: B => B): Unit = ()
+    def f20(f: B => C): Unit = ()
+    def f21(f: B => D): Unit = ()
+    def f22(f: B => E): Unit = ()
+    def f23(f: B => F): Unit = ()
+    def f24(f: C => A): Unit = ()
+    def f25(f: C => B): Unit = ()
+    def f26(f: C => C): Unit = ()
+    def f27(f: C => D): Unit = ()
+    def f28(f: C => E): Unit = ()
+    def f29(f: C => F): Unit = ()
+    def f30(f: D => A): Unit = ()
+    def f31(f: D => B): Unit = ()
+    def f32(f: D => C): Unit = ()
+    def f33(f: D => D): Unit = ()
+    def f34(f: D => E): Unit = ()
+    def f35(f: D => F): Unit = ()
+    def f36(f: E => A): Unit = ()
+    def f37(f: E => B): Unit = ()
+    def f38(f: E => C): Unit = ()
+    def f39(f: E => D): Unit = ()
+    def f40(f: E => E): Unit = ()
+    def f41(f: E => F): Unit = ()
+    def f42(f: F => A): Unit = ()
+    def f43(f: F => B): Unit = ()
+    def f44(f: F => C): Unit = ()
+    def f45(f: F => D): Unit = ()
+    def f46(f: F => E): Unit = ()
+    def f47(f: F => F): Unit = ()
+
+    def f48(): A => A = null
+    def f49(): A => B = null
+    def f50(): A => C = null
+    def f51(): A => D = null
+    def f52(): A => E = null
+    def f53(): A => F = null
+    def f54(): B => A = null
+    def f55(): B => B = null
+    def f56(): B => C = null
+    def f57(): B => D = null
+    def f58(): B => E = null
+    def f59(): B => F = null
+    def f60(): C => A = null
+    def f61(): C => B = null
+    def f62(): C => C = null
+    def f63(): C => D = null
+    def f64(): C => E = null
+    def f65(): C => F = null
+    def f66(): D => A = null
+    def f67(): D => B = null
+    def f68(): D => C = null
+    def f69(): D => D = null
+    def f70(): D => E = null
+    def f71(): D => F = null
+    def f72(): E => A = null
+    def f73(): E => B = null
+    def f74(): E => C = null
+    def f75(): E => D = null
+    def f76(): E => E = null
+    def f77(): E => F = null
+    def f78(): F => A = null
+    def f79(): F => B = null
+    def f80(): F => C = null
+    def f81(): F => D = null
+    def f82(): F => E = null
+    def f83(): F => F = null
+
+    def f84(x: A): A = ???
+    def f85(x: A): B = ???
+    def f86(x: A): C = ???
+    def f87(x: A): D = ???
+    def f88(x: A): E = ???
+    def f89(x: A): F = ???
+    def f90(x: B): A = ???
+    def f91(x: B): B = ???
+    def f92(x: B): C = ???
+    def f93(x: B): D = ???
+    def f94(x: B): E = ???
+    def f95(x: B): F = ???
+    def f96(x: C): A = ???
+    def f97(x: C): B = ???
+    def f98(x: C): C = ???
+    def f99(x: C): D = ???
+    def f100(x: C): E = ???
+    def f101(x: C): F = ???
+    def f102(x: D): A = ???
+    def f103(x: D): B = ???
+    def f104(x: D): C = ???
+    def f105(x: D): D = ???
+    def f106(x: D): E = ???
+    def f107(x: D): F = ???
+    def f108(x: E): A = ???
+    def f109(x: E): B = ???
+    def f110(x: E): C = ???
+    def f111(x: E): D = ???
+    def f112(x: E): E = ???
+    def f113(x: E): F = ???
+    def f114(x: F): A = ???
+    def f115(x: F): B = ???
+    def f116(x: F): C = ???
+    def f117(x: F): D = ???
+    def f118(x: F): E = ???
+    def f119(x: F): F = ???
+
+    object O1 extends Cov[A]
+    object O2 extends Cov[B]
+    object O3 extends Cov[C]
+    object O4 extends Cov[D]
+    object O5 extends Cov[E]
+    object O6 extends Cov[F]
+    object O7 extends Con[A]
+    object O8 extends Con[B]
+    object O9 extends Con[C]
+    object O10 extends Con[D]
+    object O11 extends Con[E]
+    object O12 extends Con[F]
+    object O13 extends Inv[A]
+    object O14 extends Inv[B]
+    object O15 extends Inv[C]
+    object O16 extends Inv[D]
+    object O17 extends Inv[E]
+    object O18 extends Inv[F]
+
+    ()
+  }
+}
diff --git a/test/files/pos/variances-flip.scala b/test/files/pos/variances-flip.scala
new file mode 100644
index 0000000000..c3ea7b571d
--- /dev/null
+++ b/test/files/pos/variances-flip.scala
@@ -0,0 +1,7 @@
+trait Foo[-A, +B, -C, +D] {
+  private[this] def b: B = ???
+  private[this] def d: D = ???
+
+  def f(p1: B => A, p2: D => C) = g(p1(b), p2(d))
+  def g(x: A, y: C) = ((b, d))
+}