diff options
| -rw-r--r-- | src/reflect/scala/reflect/internal/annotations/uncheckedBounds.scala | 13 | ||||
| -rw-r--r-- | test/files/neg/t7694b.check | 7 | ||||
| -rw-r--r-- | test/files/pos/t7694.scala | 40 |
3 files changed, 60 insertions, 0 deletions
diff --git a/src/reflect/scala/reflect/internal/annotations/uncheckedBounds.scala b/src/reflect/scala/reflect/internal/annotations/uncheckedBounds.scala new file mode 100644 index 0000000000..a44bb54734 --- /dev/null +++ b/src/reflect/scala/reflect/internal/annotations/uncheckedBounds.scala @@ -0,0 +1,13 @@ +package scala.reflect +package internal +package annotations + +/** + * An annotation that designates the annotated type should not be checked for violations of + * type parameter bounds in the `refchecks` phase of the compiler. This can be used by synthesized + * code the uses an inferred type of an expression as the type of an artifict val/def (for example, + * a temporary value introduced by an ANF transform). See [[https://issues.scala-lang.org/browse/SI-7694]]. + * + * @since 2.10.3 + */ +final class uncheckedBounds extends scala.annotation.StaticAnnotation diff --git a/test/files/neg/t7694b.check b/test/files/neg/t7694b.check new file mode 100644 index 0000000000..ea3d7736f8 --- /dev/null +++ b/test/files/neg/t7694b.check @@ -0,0 +1,7 @@ +t7694b.scala:8: error: type arguments [_3,_4] do not conform to trait L's type parameter bounds [A2,B2 <: A2] + def d = if (true) (null: L[A, A]) else (null: L[B, B]) + ^ +t7694b.scala:9: error: type arguments [_1,_2] do not conform to trait L's type parameter bounds [A2,B2 <: A2] + val v = if (true) (null: L[A, A]) else (null: L[B, B]) + ^ +two errors found diff --git a/test/files/pos/t7694.scala b/test/files/pos/t7694.scala new file mode 100644 index 0000000000..9852d5ec79 --- /dev/null +++ b/test/files/pos/t7694.scala @@ -0,0 +1,40 @@ +trait A +trait B + +trait L[A2, B2 <: A2] { + def bar(a: Any, b: Any) = 0 +} + +object Lub { + // use named args transforms to include TypeTree(<lub.tpe>) in the AST before refchecks. + def foo(a: L[_, _], b: Any) = 0 + + foo(b = 0, a = if (true) (null: L[A, A]) else (null: L[B, B])) + + (if (true) (null: L[A, A]) else (null: L[B, B])).bar(b = 0, a = 0) +} + +/* +The LUB ends up as: + +TypeRef( + TypeSymbol( + abstract trait L#7038[A2#7039, B2#7040 <: A2#7039] extends AnyRef#2197 + + ) + args = List( + AbstractTypeRef( + AbstractType( + type _1#13680 >: A#7036 with B#7037 <: Object#1752 + ) + ) + AbstractTypeRef( + AbstractType( + type _2#13681 >: A#7036 with B#7037 <: Object#1752 + ) + ) + ) +) + +Note that type _2#13681 is *not* bound by _1#13680 +*/ |