From 74cee6abb41bf84bd5c037a64ad96d9987746703 Mon Sep 17 00:00:00 2001
From: liu fengyun <liu@fengy.me>
Date: Sun, 27 Nov 2016 20:57:43 +0100
Subject: [PATCH 1/2] fix #1748: desugaring with StringContext in PatDef

---
 compiler/src/dotty/tools/dotc/ast/Desugar.scala |  2 ++
 tests/pos/i1784.scala                           | 14 ++++++++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 tests/pos/i1784.scala

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/pos/i1784.scala b/tests/pos/i1784.scala
new file mode 100644
index 000000000000..9bd487caa062
--- /dev/null
+++ b/tests/pos/i1784.scala
@@ -0,0 +1,14 @@
+object Test {
+  implicit class Foo(sc: StringContext) {
+    object q {
+      def unapply(args: Any*): Option[(Any, Any)] =
+        Some((sc.parts(0), sc.parts(1)))
+    }
+  }
+
+  def f(defn: Any): Any = {
+    val q"class $name extends $parent" =  defn
+    println(name)
+    println(parent)
+  }
+}
\ No newline at end of file

From 8f3301e48ed82dbfc316082d293849a45e187d13 Mon Sep 17 00:00:00 2001
From: liu fengyun <liu@fengy.me>
Date: Mon, 28 Nov 2016 09:43:03 +0100
Subject: [PATCH 2/2] make test runnable

---
 tests/run/i1748.check                      | 2 ++
 tests/{pos/i1784.scala => run/i1748.scala} | 6 +++---
 2 files changed, 5 insertions(+), 3 deletions(-)
 create mode 100644 tests/run/i1748.check
 rename tests/{pos/i1784.scala => run/i1748.scala} (53%)

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/pos/i1784.scala b/tests/run/i1748.scala
similarity index 53%
rename from tests/pos/i1784.scala
rename to tests/run/i1748.scala
index 9bd487caa062..bb3df1336563 100644
--- a/tests/pos/i1784.scala
+++ b/tests/run/i1748.scala
@@ -1,13 +1,13 @@
 object Test {
   implicit class Foo(sc: StringContext) {
     object q {
-      def unapply(args: Any*): Option[(Any, Any)] =
+      def unapply(arg: Any): Option[(Any, Any)] =
         Some((sc.parts(0), sc.parts(1)))
     }
   }
 
-  def f(defn: Any): Any = {
-    val q"class $name extends $parent" =  defn
+  def main(args: Array[String]): Unit = {
+    val q"class $name extends $parent" = new Object
     println(name)
     println(parent)
   }