[tests] Add test data for KT-52838

compiler/testData/diagnostics/tests/builderInference/issues/kt52838a.fir.kt

@@ -0,0 +1,29 @@
+// ISSUE: KT-52838
+// CHECK_TYPE_WITH_EXACT
+
+fun test() {
+    val buildee = <!NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER, NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>build<!> {
+        this as DerivedBuildee<*, *>
+        getTypeVariableA()
+        getTypeVariableB()
+    }
+    // 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<*, *><!>>(buildee)
+}
+
+
+
+
+open class Buildee<TVA, TVB> {
+    fun getTypeVariableA(): TVA = storageA
+    fun getTypeVariableB(): TVB = storageB
+    private var storageA: TVA = null!!
+    private var storageB: TVB = null!!
+}
+
+class DerivedBuildee<TAA, TAB>: Buildee<TAA, TAB>()
+
+fun <PTVA, PTVB> build(instructions: Buildee<PTVA, PTVB>.() -> Unit): Buildee<PTVA, PTVB> {
+    return DerivedBuildee<PTVA, PTVB>().apply(instructions)
+}