diff options
Diffstat (limited to 'src/compiler/scala/tools/nsc/transform/UnCurry.scala')
| -rw-r--r-- | src/compiler/scala/tools/nsc/transform/UnCurry.scala | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/UnCurry.scala b/src/compiler/scala/tools/nsc/transform/UnCurry.scala index afa0fc92ff..9c4b125fc1 100644 --- a/src/compiler/scala/tools/nsc/transform/UnCurry.scala +++ b/src/compiler/scala/tools/nsc/transform/UnCurry.scala @@ -77,8 +77,8 @@ abstract class UnCurry extends InfoTransform // We use Java's LambdaMetaFactory (LMF), which requires an interface for the sam's owner private def mustExpandFunction(fun: Function) = forceExpandFunction || { // (TODO: Can't use isInterface, yet, as it hasn't been updated for the new trait encoding) - val canUseLambdaMetaFactory = inConstructorFlag == 0 && (fun.attachments.get[SAMFunction].map(_.samTp) match { - case Some(userDefinedSamTp) => + val canUseLambdaMetaFactory = inConstructorFlag == 0 && (fun.attachments.get[SAMFunction] match { + case Some(SAMFunction(userDefinedSamTp, sam)) => val tpSym = erasure.javaErasure(userDefinedSamTp).typeSymbol // we only care about what ends up in the bytecode ( // LMF only supports interfaces @@ -90,7 +90,9 @@ abstract class UnCurry extends InfoTransform // to expand sam at compile time or use LMF, and this implementation restriction could be lifted. && tpSym.isStatic // impl restriction -- we currently use the boxed apply, so not really useful to allow specialized sam types (https://github.com/scala/scala/pull/4971#issuecomment-198119167) - && !tpSym.isSpecialized + // specialization and LMF are at odds, since LMF implements the single abstract method, + // but that's the one that specialization leaves generic, whereas we need to implement the specialized one to avoid boxing + && !specializeTypes.isSpecializedIn(sam, userDefinedSamTp) ) case _ => true // our built-in FunctionN's are suitable for LambdaMetaFactory by construction |