diff --git a/compiler/src/dotty/tools/dotc/ast/Desugar.scala b/compiler/src/dotty/tools/dotc/ast/Desugar.scala
index 4b2ff1bc313f..c8b1ed909967 100644
--- a/compiler/src/dotty/tools/dotc/ast/Desugar.scala
+++ b/compiler/src/dotty/tools/dotc/ast/Desugar.scala
@@ -1079,6 +1079,8 @@ object desugar {
         collect(tree)
       case Tuple(trees) =>
         trees foreach collect
+      case Thicket(trees) =>
+        trees foreach collect
       case _ =>
     }
     collect(tree)
diff --git a/tests/run/i1748.check b/tests/run/i1748.check
new file mode 100644
index 000000000000..888299747af9
--- /dev/null
+++ b/tests/run/i1748.check
@@ -0,0 +1,2 @@
+class 
+ extends 
diff --git a/tests/run/i1748.scala b/tests/run/i1748.scala
new file mode 100644
index 000000000000..bb3df1336563
--- /dev/null
+++ b/tests/run/i1748.scala
@@ -0,0 +1,14 @@
+object Test {
+  implicit class Foo(sc: StringContext) {
+    object q {
+      def unapply(arg: Any): Option[(Any, Any)] =
+        Some((sc.parts(0), sc.parts(1)))
+    }
+  }
+
+  def main(args: Array[String]): Unit = {
+    val q"class $name extends $parent" = new Object
+    println(name)
+    println(parent)
+  }
+}
\ No newline at end of file