FIR checker: report SMARTCAST_IMPOSSIBLE for local variables

compiler/testData/diagnostics/testsWithStdLib/smartcasts/forEachSafe.fir.kt

@@ -1,11 +0,0 @@
-// KT-7186: False "Type mismatch" error
-
-fun indexOfMax(a: IntArray): Int? {
-    var maxI: Int? = null
-    a.forEachIndexed { i, value ->
-        if (maxI == null || value >= a[maxI]) {
-            maxI = i
-        }
-    }
-    return maxI
-}

compiler/testData/diagnostics/testsWithStdLib/smartcasts/forEachSafe.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // KT-7186: False "Type mismatch" error
 
 fun indexOfMax(a: IntArray): Int? {

compiler/testData/diagnostics/testsWithStdLib/smartcasts/lambdaInCallArgs.fir.kt

@@ -0,0 +1,38 @@
+fun foo(x: Int, y: Any?, z: Int) {}
+
+fun myRun(block: () -> Unit): Any? {
+    return null
+}
+
+fun test_1() {
+    var x: String? = null
+    if (x != null) {
+        foo(
+            x.length, // stable smartcast
+            run { x = "" },
+            x.length  // stable smartcast
+        )
+    }
+}
+
+fun test_2() {
+    var x: String? = null
+    if (x != null) {
+        foo(
+            x.length, // stable smartcast
+            myRun { x = "" },
+            <!SMARTCAST_IMPOSSIBLE!>x<!>.length  // unstable smartcast
+        )
+    }
+}
+
+fun test_3() {
+    var x: String? = null
+    if (x != null) {
+        foo(
+            x.length, // stable smartcast
+            { x = "" },
+            <!SMARTCAST_IMPOSSIBLE!>x<!>.length  // stable smartcast
+        )
+    }
+}

compiler/testData/diagnostics/testsWithStdLib/smartcasts/lambdaInCallArgs.kt

@@ -0,0 +1,38 @@
+fun foo(x: Int, y: Any?, z: Int) {}
+
+fun myRun(block: () -> Unit): Any? {
+    return null
+}
+
+fun test_1() {
+    var x: String? = null
+    if (x != null) {
+        foo(
+            <!DEBUG_INFO_SMARTCAST!>x<!>.length, // stable smartcast
+            run { x = "" },
+            <!SMARTCAST_IMPOSSIBLE!>x<!>.length  // stable smartcast
+        )
+    }
+}
+
+fun test_2() {
+    var x: String? = null
+    if (x != null) {
+        foo(
+            <!DEBUG_INFO_SMARTCAST!>x<!>.length, // stable smartcast
+            myRun { x = "" },
+            <!SMARTCAST_IMPOSSIBLE!>x<!>.length  // unstable smartcast
+        )
+    }
+}
+
+fun test_3() {
+    var x: String? = null
+    if (x != null) {
+        foo(
+            <!DEBUG_INFO_SMARTCAST!>x<!>.length, // stable smartcast
+            { x = "" },
+            <!SMARTCAST_IMPOSSIBLE!>x<!>.length  // stable smartcast
+        )
+    }
+}

compiler/testData/diagnostics/testsWithStdLib/smartcasts/lambdaInCallArgs.txt

@@ -0,0 +1,8 @@
+package
+
+public fun foo(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.Any?, /*2*/ z: kotlin.Int): kotlin.Unit
+public fun myRun(/*0*/ block: () -> kotlin.Unit): kotlin.Any?
+public fun test_1(): kotlin.Unit
+public fun test_2(): kotlin.Unit
+public fun test_3(): kotlin.Unit
+