KT-2505 Type mismatch: inferred type is T but T was expected

#KT-2505

compiler/testData/diagnostics/tests/inference/completeInferenceIfManyFailed.kt

@@ -0,0 +1,15 @@
+package d
+
+fun <T> joinT(<!UNUSED_PARAMETER!>x<!>: Int, vararg <!UNUSED_PARAMETER!>a<!>: T): T? {
+    return null
+}
+
+fun <T> joinT(<!UNUSED_PARAMETER!>x<!>: Any, <!UNUSED_PARAMETER!>y<!>: T): T? {
+    return null
+}
+
+fun test() {
+    val x2 = joinT(<!NON_VARARG_SPREAD!>*<!>1, "2")
+    x2 : String?
+}
+