Add test for KT-54744

compiler/testData/diagnostics/tests/smartCasts/variables/reassignedDependency.fir.kt

@@ -0,0 +1,40 @@
+// SKIP_TXT
+
+class C(val x: String?)
+
+fun test1() {
+    var c = C("...")
+    val x = c.x
+    if (x == null) return
+    x.length // ok
+    c.x.length // ok
+    c = C(null)
+    x<!UNSAFE_CALL!>.<!>length // ok
+    c.x<!UNSAFE_CALL!>.<!>length // bad
+}
+
+fun test2() {
+    var c = C("...")
+    val x = c.x
+    if (x == null) return
+    while (true) {
+        x<!UNSAFE_CALL!>.<!>length // ok
+        c.x<!UNSAFE_CALL!>.<!>length // bad
+        c = C(null)
+        x<!UNSAFE_CALL!>.<!>length // ok
+        c.x<!UNSAFE_CALL!>.<!>length // bad
+    }
+}
+
+fun test3(p: Boolean) {
+    var c = C("...")
+    val x = c.x
+    if (x == null) return
+    x.length // ok
+    c.x.length // ok
+    if (p) {
+        c = C(null)
+    }
+    x.length // ok
+    c.x.length // bad
+}

compiler/testData/diagnostics/tests/smartCasts/variables/reassignedDependency.kt

@@ -0,0 +1,40 @@
+// SKIP_TXT
+
+class C(val x: String?)
+
+fun test1() {
+    var c = C("...")
+    val x = c.x
+    if (x == null) return
+    <!DEBUG_INFO_SMARTCAST!>x<!>.length // ok
+    c.x<!UNSAFE_CALL!>.<!>length // ok
+    c = C(null)
+    <!DEBUG_INFO_SMARTCAST!>x<!>.length // ok
+    c.x<!UNSAFE_CALL!>.<!>length // bad
+}
+
+fun test2() {
+    var c = C("...")
+    val x = c.x
+    if (x == null) return
+    while (true) {
+        <!DEBUG_INFO_SMARTCAST!>x<!>.length // ok
+        c.x<!UNSAFE_CALL!>.<!>length // bad
+        c = C(null)
+        <!DEBUG_INFO_SMARTCAST!>x<!>.length // ok
+        c.x<!UNSAFE_CALL!>.<!>length // bad
+    }
+}
+
+fun test3(p: Boolean) {
+    var c = C("...")
+    val x = c.x
+    if (x == null) return
+    <!DEBUG_INFO_SMARTCAST!>x<!>.length // ok
+    c.x<!UNSAFE_CALL!>.<!>length // ok
+    if (p) {
+        c = C(null)
+    }
+    <!DEBUG_INFO_SMARTCAST!>x<!>.length // ok
+    c.x<!UNSAFE_CALL!>.<!>length // bad
+}