add more tests

Author: liufengyun

tests/pos/i1846.scala

@@ -0,0 +1,4 @@
+0
+42
+0
+0

tests/run/i1846.check

@@ -0,0 +1,22 @@
+object Test {
+  def main(args: Array[String]): Unit = {
+    val x = 42
+
+    x match {
+      case {42}.toString => println(42)
+      case _ => println(0)
+    }
+
+    42 match { case { 42 } => println(42) }
+
+    42 match {
+      case { 42 }.toString => println(42)
+      case _ => println(0)
+    }
+
+    "h" match {
+      case { 42.toString } => println(42)
+      case _ => println(0)
+    }
+  }
+}