[FIR] Properly check is some setter function is applicable for synthetic property

^KT-56506 Fixed

compiler/testData/diagnostics/tests/controlFlowAnalysis/assignmentOfSyntheticVarWithInconsistentNullability.fir.kt

@@ -0,0 +1,96 @@
+// ISSUE: KT-56506
+// FILE: JavaBase.java
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public interface JavaBase {
+    @NotNull String getFoo();
+
+    // Important: no parameter nullability!
+    void setFoo(String arg);
+}
+
+// FILE: JavaOverride.java
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class JavaOverride implements JavaBase {
+    @Override
+    @NotNull
+    public String getFoo() {
+        return "";
+    }
+
+    // Important: parameter is nullable!
+    @Override
+    public void setFoo(@Nullable String arg) {}
+}
+
+// FILE: NoOverride.java
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class NoOverride {
+    @NotNull
+    public String getFoo() {
+        return "";
+    }
+
+    // Important: parameter is nullable!
+    public void setFoo(@Nullable String arg) {}
+}
+
+// FILE: KotlinBase.kt
+open class KotlinBase {
+    val foo: String
+        get() = ""
+}
+
+// FILE: KotlinOverrideBase.java
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public interface KotlinOverrideBase extends KotlinBase {
+    @Override
+    @NotNull String getFoo();
+
+    void setFoo(String arg);
+}
+
+// FILE: KotlinOverride.java
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class KotlinOverride implements KotlinOverrideBase {
+    @Override
+    @NotNull
+    public String getFoo() {
+        return "";
+    }
+
+    // Important: parameter is nullable!
+    @Override
+    public void setFoo(@Nullable String arg) {}
+}
+
+// FILE: main.kt
+fun test_1(d: NoOverride, s: String) {
+    d.<!VAL_REASSIGNMENT!>foo<!> = s
+}
+
+fun test_2(d: JavaBase, s: String) {
+    d.foo = s
+}
+
+fun test_3(d: JavaOverride, s: String) {
+    d.foo = s
+}
+
+fun test_4(d: KotlinOverrideBase, s: String) {
+    d.<!VAL_REASSIGNMENT!>foo<!> = s
+}
+
+fun test_5(d: KotlinOverride, s: String) {
+    d.<!VAL_REASSIGNMENT!>foo<!> = s
+}

compiler/testData/diagnostics/tests/controlFlowAnalysis/assignmentOfSyntheticVarWithInconsistentNullability.kt

@@ -0,0 +1,96 @@
+// ISSUE: KT-56506
+// FILE: JavaBase.java
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public interface JavaBase {
+    @NotNull String getFoo();
+
+    // Important: no parameter nullability!
+    void setFoo(String arg);
+}
+
+// FILE: JavaOverride.java
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class JavaOverride implements JavaBase {
+    @Override
+    @NotNull
+    public String getFoo() {
+        return "";
+    }
+
+    // Important: parameter is nullable!
+    @Override
+    public void setFoo(@Nullable String arg) {}
+}
+
+// FILE: NoOverride.java
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class NoOverride {
+    @NotNull
+    public String getFoo() {
+        return "";
+    }
+
+    // Important: parameter is nullable!
+    public void setFoo(@Nullable String arg) {}
+}
+
+// FILE: KotlinBase.kt
+open class KotlinBase {
+    val foo: String
+        get() = ""
+}
+
+// FILE: KotlinOverrideBase.java
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public interface KotlinOverrideBase extends KotlinBase {
+    @Override
+    @NotNull String getFoo();
+
+    void setFoo(String arg);
+}
+
+// FILE: KotlinOverride.java
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class KotlinOverride implements KotlinOverrideBase {
+    @Override
+    @NotNull
+    public String getFoo() {
+        return "";
+    }
+
+    // Important: parameter is nullable!
+    @Override
+    public void setFoo(@Nullable String arg) {}
+}
+
+// FILE: main.kt
+fun test_1(d: NoOverride, s: String) {
+    <!VAL_REASSIGNMENT!>d.foo<!> = s
+}
+
+fun test_2(d: JavaBase, s: String) {
+    d.foo = s
+}
+
+fun test_3(d: JavaOverride, s: String) {
+    d.foo = s
+}
+
+fun test_4(d: KotlinOverrideBase, s: String) {
+    <!VAL_REASSIGNMENT!>d.foo<!> = s
+}
+
+fun test_5(d: KotlinOverride, s: String) {
+    <!VAL_REASSIGNMENT!>d.foo<!> = s
+}