[tests] Add test data for KT-55281

compiler/testData/codegen/box/builderInference/issues/kt55281.kt

@@ -0,0 +1,31 @@
+// ISSUE: KT-55281
+
+// IGNORE_LIGHT_ANALYSIS
+// IGNORE_BACKEND_K2: ANY
+// REASON: red code (see corresponding diagnostic test)
+
+fun box(): String {
+    build {
+        this as DerivedBuildee<*>
+        consumeNullableAny(getTypeVariable())
+    }
+    return "OK"
+}
+
+
+
+
+class TargetType
+
+fun consumeNullableAny(value: Any?) {}
+
+open class Buildee<TV> {
+    fun getTypeVariable(): TV = storage
+    private var storage: TV = null as TV
+}
+
+class DerivedBuildee<TA>: Buildee<TA>()
+
+fun <PTV> build(instructions: Buildee<PTV>.() -> Unit): Buildee<PTV> {
+    return DerivedBuildee<PTV>().apply(instructions)
+}

compiler/testData/diagnostics/tests/builderInference/issues/kt55281.fir.kt

@@ -0,0 +1,30 @@
+// ISSUE: KT-55281
+// CHECK_TYPE_WITH_EXACT
+
+fun test() {
+    val buildee = <!NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>build<!> {
+        this as DerivedBuildee<*>
+        consumeNullableAny(getTypeVariable())
+    }
+    // exact type equality check — turns unexpected compile-time behavior into red code
+    // considered to be non-user-reproducible code for the purposes of these tests
+    <!NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>checkExactType<!><<!CANNOT_INFER_PARAMETER_TYPE!>Buildee<Any?><!>>(buildee)
+}
+
+
+
+
+class TargetType
+
+fun consumeNullableAny(value: Any?) {}
+
+open class Buildee<TV> {
+    fun getTypeVariable(): TV = storage
+    private var storage: TV = null!!
+}
+
+class DerivedBuildee<TA>: Buildee<TA>()
+
+fun <PTV> build(instructions: Buildee<PTV>.() -> Unit): Buildee<PTV> {
+    return DerivedBuildee<PTV>().apply(instructions)
+}

compiler/testData/diagnostics/tests/builderInference/issues/kt55281.kt

@@ -0,0 +1,30 @@
+// ISSUE: KT-55281
+// CHECK_TYPE_WITH_EXACT
+
+fun test() {
+    val buildee = build {
+        this as DerivedBuildee<*>
+        consumeNullableAny(getTypeVariable())
+    }
+    // exact type equality check — turns unexpected compile-time behavior into red code
+    // considered to be non-user-reproducible code for the purposes of these tests
+    checkExactType<Buildee<Any?>>(buildee)
+}
+
+
+
+
+class TargetType
+
+fun consumeNullableAny(value: Any?) {}
+
+open class Buildee<TV> {
+    fun getTypeVariable(): TV = storage
+    private var storage: TV = null!!
+}
+
+class DerivedBuildee<TA>: Buildee<TA>()
+
+fun <PTV> build(instructions: Buildee<PTV>.() -> Unit): Buildee<PTV> {
+    return DerivedBuildee<PTV>().apply(instructions)
+}