1 files changed, 5 insertions, 0 deletions
diff --git a/src/dotty/tools/dotc/config/SJSPlatform.scala b/src/dotty/tools/dotc/config/SJSPlatform.scala
index fec9c25a1..3ec8049ae 100644
--- a/src/dotty/tools/dotc/config/SJSPlatform.scala
+++ b/src/dotty/tools/dotc/config/SJSPlatform.scala
@@ -2,6 +2,7 @@ package dotty.tools.dotc.config
 
 import dotty.tools.dotc.core._
 import Contexts._
+import Symbols._
 
 import dotty.tools.backend.sjs.JSDefinitions
 
@@ -10,4 +11,8 @@ class SJSPlatform()(implicit ctx: Context) extends JavaPlatform {
   /** Scala.js-specific definitions. */
   val jsDefinitions: JSDefinitions = new JSDefinitions()
 
+  /** Is the SAMType `cls` also a SAM under the rules of the Scala.js back-end? */
+  override def isSam(cls: ClassSymbol)(implicit ctx: Context): Boolean =
+    defn.isFunctionClass(cls) || jsDefinitions.isJSFunctionClass(cls)
+
 }