KT-1175 Mark unused literals

idea/testData/checker/ExtensionFunctions.jet

@@ -18,11 +18,11 @@ fun A.plus(<warning>a</warning> : Any) {
   1.foo()
   true.<error>foo</error>()
 
-  1
+  <warning>1</warning>
 }
 
 fun A.plus(<warning>a</warning> : Int) {
-  1
+  <warning>1</warning>
 }
 
 fun <T> T.minus(<warning>t</warning> : T) : Int = 1

idea/testData/checker/StringTemplates.jet

@@ -7,15 +7,17 @@ fun demo() {
   fun buzz(f : () -> Any?) : Int  = 1
   val sdf = 1
   val foo = 3;
-    "$abc"
-    "$"
-    "$.$.asdf$\t"
-    "asd\$"
-    "asd$a<error>\x</error>"
-    "asd$a$asd$ $<error>xxx</error>"
-    "fosdfasdo${1 + bar + 100}}sdsdfgdsfsdf"
-    "foo${bar + map {foo}}sdfsdf"
-    "foo${bar + map { "foo" }}sdfsdf"
-    "foo${bar + map {
-      "foo$sdf${ buzz{}}" }}sdfsdf"
-}
+    use("$abc")
+    use("$")
+    use("$.$.asdf$\t")
+    use("asd\$")
+    use("asd$a<error>\x</error>")
+    use("asd$a$asd$ $<error>xxx</error>")
+    use("fosdfasdo${1 + bar + 100}}sdsdfgdsfsdf")
+    use("foo${bar + map {foo}}sdfsdf")
+    use("foo${bar + map { "foo" }}sdfsdf")
+    use("foo${bar + map {
+      "foo$sdf${ buzz{}}" }}sdfsdf")
+}
+
+fun use(<warning>s</warning>: String) {}

idea/testData/checker/UnreachableCode.jet

@@ -108,7 +108,7 @@ fun t7() : Int {
     <error>2</error>
   }
   catch (e : Any) {
-    2
+    <warning>2</warning>
   }
   return 1 // this is OK, like in Java
 }
@@ -143,8 +143,8 @@ fun failtest(<warning>a</warning> : Int) : Int {
 }
 
 fun foo(a : Nothing) : Unit {
-  1
-  a
+  <warning>1</warning>
+  <warning>a</warning>
   <error>2</error>
 }