Tests for issues fixed in ed95463

#KT-2831 Fixed
#KT-3286 Fixed
#KT-3863 Fixed
#KT-3976 Fixed

compiler/testData/codegen/box/typeMapping/kt2831.kt

@@ -0,0 +1,16 @@
+// Exception in thread "main" java.lang.VerifyError: (class: org/jetbrains/kannotator/controlFlowBuilder/GraphBuilderInterpreter, method: binaryOperation signature: (Lorg/objectweb/asm/tree/AbstractInsnNode;Lorg/jetbrains/kannotator/controlFlowBuilder/AsmPossibleValues;Lorg/jetbrains/kannotator/controlFlowBuilder/AsmPossibleValues;)Lorg/jetbrains/kannotator/controlFlowBuilder/AsmPossibleValues;) Wrong return type in function
+
+fun foo(): Nothing = throw Exception()
+
+fun bar(x: Any): Int {
+  return when(x) {
+    is String -> 0
+    is Int -> 1
+    else -> foo()
+  }
+}
+
+fun box(): String {
+    bar(3)
+    return "OK"
+}

compiler/testData/codegen/box/typeMapping/kt3286.kt

@@ -0,0 +1,13 @@
+fun test(x: Int): String = when(x) {
+        0 -> "zero"
+        1 -> "one"
+        2 -> "two"
+        else -> blowUpHorribly()
+    }
+
+fun blowUpHorribly(): Nothing = throw RuntimeException("Blow up!")
+
+fun box(): String {
+    test(1)
+    return "OK"
+}

compiler/testData/codegen/box/typeMapping/kt3863.kt

@@ -0,0 +1,17 @@
+// java.lang.VerifyError: (class: org/jetbrains/jet/plugin/completion/handlers/NotImplemented, method: get signature: (Ljava/lang/Object;Ljet/PropertyMetadata;)Ljava/lang/Object;) Unable to pop operand off an empty stack
+
+class NotImplemented<T>(){
+    fun get(thisRef: Any?, prop: PropertyMetadata): T = notImplemented()
+    fun set(thisRef: Any?, prop: PropertyMetadata, value: T) = notImplemented()
+}
+
+fun notImplemented() : Nothing = notImplemented()
+
+class Test {
+    val x: Int by NotImplemented<Int>()
+}
+
+fun box(): String {
+    Test()
+    return "OK"
+}

compiler/testData/codegen/box/typeMapping/kt3976.kt

@@ -0,0 +1,18 @@
+// java.lang.ClassNotFoundException: jet.Nothing
+
+var currentAccountId: Int? by SessionAccessor()
+class SessionAccessor<T> {
+    fun get(o : Nothing?, desc: jet.PropertyMetadata): T {
+        return null as T
+    }
+
+    fun set(o : Nothing?, desc: jet.PropertyMetadata, value: T) {
+
+    }
+}
+
+fun box(): String {
+    currentAccountId = 1
+    if (currentAccountId != null) return "Fail"
+    return "OK"
+}