[tests] Add test data for KT-47989

compiler/testData/codegen/box/builderInference/issues/kt47989a.kt

@@ -0,0 +1,32 @@
+// ISSUE: KT-47989
+
+// IGNORE_LIGHT_ANALYSIS
+// IGNORE_BACKEND: ANY
+// REASON: red code (see corresponding diagnostic test)
+
+fun box(): String {
+    build {
+        object: TypeSourceInterface {
+            override fun produceTargetType() = getTypeVariable()
+        }
+    }
+    return "OK"
+}
+
+
+
+
+class TargetType
+
+interface TypeSourceInterface {
+    fun produceTargetType(): TargetType
+}
+
+class Buildee<TV> {
+    fun getTypeVariable(): TV = storage
+    private var storage: TV = TargetType() as TV
+}
+
+fun <PTV> build(instructions: Buildee<PTV>.() -> Unit): Buildee<PTV> {
+    return Buildee<PTV>().apply(instructions)
+}

compiler/testData/codegen/box/builderInference/issues/kt47989b.kt

@@ -0,0 +1,29 @@
+// ISSUE: KT-47989
+
+// IGNORE_LIGHT_ANALYSIS
+// IGNORE_BACKEND: ANY
+// REASON: red code (see corresponding diagnostic test)
+
+fun box(): String {
+    build {
+        object: TypeSourceInterface {
+            override fun produceTargetTypeBuildee() = this@build
+        }
+    }
+    return "OK"
+}
+
+
+
+
+class TargetType
+
+interface TypeSourceInterface {
+    fun produceTargetTypeBuildee(): Buildee<TargetType>
+}
+
+class Buildee<TV>
+
+fun <PTV> build(instructions: Buildee<PTV>.() -> Unit): Buildee<PTV> {
+    return Buildee<PTV>().apply(instructions)
+}