Error on 'if' without an 'else' branch when used as an expression

compiler/testData/codegen/box/controlStructures/emptyIf.kt

@@ -1,12 +0,0 @@
-fun box(): String {
-    if (true);
-    if (false);
-    val iftrue = if (true);
-    val iffalse = if (false);
-
-    var state = 0
-    val k = if (state++==1);
-    if (state != 1) return "Fail: $state"
-
-    return "OK"
-}

compiler/testData/codegen/box/controlStructures/kt2062.kt

@@ -1,5 +0,0 @@
-fun box(): String {
-  val a = if(true) {
-  }
-  return if (a.toString() == "kotlin.Unit") "OK" else "fail"
-}

compiler/testData/codegen/box/controlStructures/kt2598.kt

@@ -1,9 +0,0 @@
-fun foo(condition: Boolean): String {
-    val u = if (condition) {
-        "OK"
-    } else {
-    }
-    return u.toString()
-}
-
-fun box() = foo(true)

compiler/testData/codegen/box/finally/notChainCatch.kt

@@ -1,5 +1,10 @@
-fun unsupportedEx() = if (true) throw UnsupportedOperationException()
-fun runtimeEx() = if (true) throw RuntimeException()
+fun unsupportedEx() {
+    if (true) throw UnsupportedOperationException()
+}
+
+fun runtimeEx() {
+    if (true) throw RuntimeException()
+}
 
 fun test1() : String {
     var s = "";

compiler/testData/codegen/box/finally/tryFinally.kt

@@ -1,5 +1,10 @@
-fun unsupportedEx() = if (true) throw UnsupportedOperationException()
-fun runtimeEx() = if (true) throw RuntimeException()
+fun unsupportedEx() {
+    if (true) throw UnsupportedOperationException()
+}
+
+fun runtimeEx() {
+    if (true) throw RuntimeException()
+}
 
 fun test1WithFinally() : String {
     var s = "";

compiler/testData/codegen/box/primitiveTypes/comparisonWithNaN.kt

@@ -1,7 +1,8 @@
 // This test checks that our bytecode is consistent with javac bytecode
 
-fun _assert(condition: Boolean): Unit =
+fun _assert(condition: Boolean) {
     if (!condition) throw AssertionError("Fail")
+}
 
 fun _assertFalse(condition: Boolean) = _assert(!condition)
 

compiler/testData/codegen/box/unit/ifElse.kt

@@ -4,9 +4,9 @@ class A (val p: String, p1: String, p2: String) {
 
     var cond2: String = ""
 
-    val prop1 = if (cond1(p)) p1
+    val prop1 = if (cond1(p)) p1 else null
 
-    val prop2 = if (cond2(p)) else;
+    val prop2 = if (cond2(p)) p2 else null;
 
 
     fun cond1(p: String): Boolean {