A set of additional tests for complex expressions DFA

compiler/testData/diagnostics/tests/smartCasts/ifCascadeExprNotNull.kt

@@ -0,0 +1,14 @@
+fun baz(s: String?): String {
+    val t = if (s == null) {
+        ""
+    }
+    else if (s == "") {
+        val u: String? = null
+        if (u == null) return ""
+        u
+    }
+    else {
+        s
+    }
+    return <!DEBUG_INFO_SMARTCAST!>t<!>
+}

compiler/testData/diagnostics/tests/smartCasts/ifCascadeExprNotNull.txt

@@ -0,0 +1,3 @@
+package
+
+public fun baz(/*0*/ s: kotlin.String?): kotlin.String

compiler/testData/diagnostics/tests/smartCasts/ifExprInConditionNonNull.kt

@@ -0,0 +1,11 @@
+fun baz(s: String?, b: Boolean?): String {
+    val t = if (if (b == null) return "" else <!DEBUG_INFO_SMARTCAST!>b<!>) {
+        if (s == null) return ""
+        s
+    }
+    else {
+        if (s != null) return <!DEBUG_INFO_SMARTCAST!>s<!>
+        ""
+    }
+    return <!DEBUG_INFO_SMARTCAST!>t<!>
+}

compiler/testData/diagnostics/tests/smartCasts/ifExprInConditionNonNull.txt

@@ -0,0 +1,3 @@
+package
+
+public fun baz(/*0*/ s: kotlin.String?, /*1*/ b: kotlin.Boolean?): kotlin.String

compiler/testData/diagnostics/tests/smartCasts/ifExprInWhenSubjectNonNull.kt

@@ -0,0 +1,11 @@
+fun baz(s: String?, u: String?): String {
+    val t = when(if (u == null) return "" else <!DEBUG_INFO_SMARTCAST!>u<!>) {
+        "abc" -> u
+        "" -> {
+            if (s == null) return ""
+            s
+        }
+        else -> u
+    }
+    return <!DEBUG_INFO_SMARTCAST!>t<!>
+}

compiler/testData/diagnostics/tests/smartCasts/ifExprInWhenSubjectNonNull.txt

@@ -0,0 +1,3 @@
+package
+
+public fun baz(/*0*/ s: kotlin.String?, /*1*/ u: kotlin.String?): kotlin.String

compiler/testData/diagnostics/tests/smartCasts/ifWhenExprNonNull.kt

@@ -0,0 +1,13 @@
+fun baz(s: String?): String {
+    val t = if (s == null) {
+        ""
+    }
+    else {
+        val u: String? = null
+        when (u) {
+            null -> ""
+            else -> u
+        }
+    }
+    return <!DEBUG_INFO_SMARTCAST!>t<!>
+}

compiler/testData/diagnostics/tests/smartCasts/ifWhenExprNonNull.txt

@@ -0,0 +1,3 @@
+package
+
+public fun baz(/*0*/ s: kotlin.String?): kotlin.String

compiler/testData/diagnostics/tests/smartCasts/shortIfExprNotNull.kt

@@ -0,0 +1,9 @@
+fun baz(s: String?): String {
+    val t = if (s != null) s
+    else {
+        val u: String? = null
+        if (u == null) return ""
+        u
+    }
+    return <!DEBUG_INFO_SMARTCAST!>t<!>
+}

compiler/testData/diagnostics/tests/smartCasts/shortIfExprNotNull.txt

@@ -0,0 +1,3 @@
+package
+
+public fun baz(/*0*/ s: kotlin.String?): kotlin.String

compiler/testData/diagnostics/tests/smartCasts/whenIfExprNonNull.kt

@@ -0,0 +1,13 @@
+fun baz(s: String?, u: String?): String {
+    val t = when(s) {
+        is String -> {
+            if (u == null) return <!DEBUG_INFO_SMARTCAST!>s<!>
+            u
+        }
+        else -> {
+            if (u == null) return ""
+            u
+        }
+    }
+    return <!DEBUG_INFO_SMARTCAST!>t<!>
+}

compiler/testData/diagnostics/tests/smartCasts/whenIfExprNonNull.txt

@@ -0,0 +1,3 @@
+package
+
+public fun baz(/*0*/ s: kotlin.String?, /*1*/ u: kotlin.String?): kotlin.String