[tests] Add test data for KT-60291

compiler/testData/codegen/box/builderInference/issues/kt60291b.kt

@@ -0,0 +1,30 @@
+// ISSUE: KT-60291
+
+// IGNORE_LIGHT_ANALYSIS
+// IGNORE_BACKEND_K1: ANY
+// REASON: red code (see corresponding diagnostic test)
+
+// IGNORE_BACKEND_K2: NATIVE, WASM, JS_IR, JS_IR_ES6
+// REASON: compile-time failure (org.jetbrains.kotlin.backend.common.linkage.issues.IrDisallowedErrorNode: Class found but error nodes are not allowed)
+
+fun box(): String {
+    if (true)
+        build { setTypeVariable(TargetType()) }
+    else
+        build {}
+    return "OK"
+}
+
+
+
+
+class TargetType
+
+class Buildee<TV> {
+    fun setTypeVariable(value: TV) { storage = value }
+    private var storage: TV = TargetType() as TV
+}
+
+fun <PTV> build(instructions: Buildee<PTV>.() -> Unit): Buildee<PTV> {
+    return Buildee<PTV>().apply(instructions)
+}