Merge pull request #1749 from dotty-staging/fix-i1748

fix #1748: desugaring with StringContext in PatDef

Author: felixmulder

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)

tests/run/i1748.check

@@ -0,0 +1,2 @@
+class 
+ extends 

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)
+  }
+}