better elvis + throw

+added run {}

lynglib/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt

@@ -376,6 +376,11 @@ class Compiler(
 
                         }
 
+                        "throw" -> {
+                            val s = parseThrowStatement()
+                            operand = Accessor { s.execute(it).asReadonly }
+                        }
+
                         else -> operand?.let { left ->
                             // selector: <lvalue>, '.' , <id>
                             // we replace operand with selector code, that

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/Obj.kt

@@ -315,6 +315,9 @@ open class Obj {
                 args.firstAndOnly().callOn(copy(Arguments(thisObj)))
                 thisObj
             }
+            addFn("run") {
+                args.firstAndOnly().callOn(this)
+            }
             addFn("getAt") {
                 requireExactCount(1)
                 thisObj.getAt(this, requiredArg<Obj>(0))

lynglib/src/commonTest/kotlin/ScriptTest.kt

@@ -2961,5 +2961,25 @@ class ScriptTest {
         """.trimIndent())
     }
 
+    @Test
+    fun testElvisAndThrow() = runTest {
+        eval("""
+            val x = assertThrows {
+                null ?: throw "test" + "x"
+            }
+            assertEquals( "testx", x.message)
+        """.trimIndent())
+    }
+
+    @Test
+    fun testElvisAndRunThrow() = runTest {
+        eval("""
+            val x = assertThrows {
+                null ?: run { throw "testx" }
+            }
+            assertEquals( "testx", x.message)
+        """.trimIndent())
+    }
+
 
 }