Minor. Add tests

compiler/testData/codegen/box/inlineClasses/callableReferences/kt37986Generic.kt

@@ -0,0 +1,27 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses, +GenericInlineClassParameter
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class R<T: Any>(val x: T)
+
+fun useR(r: R<String>) {
+    if (r.x as String != "OK") throw AssertionError("$r")
+}
+
+fun useR0(fn: () -> R<String>) {
+    useR(fn())
+}
+
+fun useR1(r: R<String>, fn: (R<String>) -> R<String>) {
+    useR(fn(r))
+}
+
+fun fnWithDefaultR(r: R<String> = R("OK")) = r
+
+fun box(): String {
+    useR0(::fnWithDefaultR)
+    useR1(R("OK"), ::fnWithDefaultR)
+
+    return "OK"
+}