Generating "firstOrNull()?.let {...}"

idea/testData/intentions/loopToCallChain/firstOrNull_cannotUseLet.kt

@@ -0,0 +1,13 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+fun foo(list: List<String?>) {
+    var result: String? = null
+    <caret>for (s in list) {
+        if (s != null && s.length > 0) {
+            result = bar(s)
+            break
+        }
+    }
+}
+
+fun bar(s: String?): String? = s

idea/testData/intentions/loopToCallChain/firstOrNull_let.kt

@@ -0,0 +1,12 @@
+// WITH_RUNTIME
+fun foo(list: List<String>) {
+    var result: String? = null
+    <caret>for (s in list) {
+        if (s.length > 0) {
+            result = bar(s)
+            break
+        }
+    }
+}
+
+fun bar(s: String): String = s

idea/testData/intentions/loopToCallChain/firstOrNull_let.kt.after

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+fun foo(list: List<String>) {
+    <caret>val result: String? = list.firstOrNull { it.length > 0 }?.let { bar(it) }
+}
+
+fun bar(s: String): String = s

idea/testData/intentions/loopToCallChain/firstOrNull_returnExpression.kt

@@ -1,5 +1,4 @@
 // WITH_RUNTIME
-// IS_APPLICABLE: false
 fun foo(list: List<String>): Int? {
     <caret>for (s in list) {
         if (s.isNotEmpty()) {

idea/testData/intentions/loopToCallChain/firstOrNull_returnExpression.kt.after

@@ -0,0 +1,4 @@
+// WITH_RUNTIME
+fun foo(list: List<String>): Int? {
+    <caret>return list.firstOrNull { it.isNotEmpty() }?.let { it.length }
+}