checking subtype for invariant type with error generic argument may success

compiler/testData/diagnostics/tests/inference/reportingImprovements/subtypeForInvariantWithErrorGenerics.kt

@@ -0,0 +1,12 @@
+package a
+
+fun foo<R> (f: ()->R, r: MutableList<R>) = r.add(f())
+fun bar<R> (r: MutableList<R>, f: ()->R) = r.add(f())
+
+fun test() {
+    val <!UNUSED_VARIABLE!>a<!> = <!TYPE_INFERENCE_CONFLICTING_SUBSTITUTIONS!>foo<!>({1}, arrayListOf("")) //no type inference error on 'arrayListOf'
+    val <!UNUSED_VARIABLE!>b<!> = <!TYPE_INFERENCE_CONFLICTING_SUBSTITUTIONS!>bar<!>(arrayListOf(""), {1})
+}
+
+// from standard library
+fun arrayListOf<T>(vararg <!UNUSED_PARAMETER!>values<!>: T) : MutableList<T> {<!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>