Add support for enums in error message

[gordinskiy]

Attempt to resolve #289

[ReSpawN]

God yes. I just bumped into this with Assert::nullOrOneOf($type, self::$allowedCarbonTypes)

Big +1

[shadowhand]

@gordinskiy recognizing that it has been a year... 😅 would you please rebase this?

[gordinskiy]

@shadowhand done

[shadowhand]

@gordinskiy will you please add a test for this? It will need to be restricted to PHP versions that support Enum, of course.

[gordinskiy]

Added test case for error message with enum in it.

[gordinskiy]

Ok, tests fails on old versions.
We can wrap enum declaration inside eval.
Would this be an acceptable solution or maybe you have a better one?

if (PHP_VERSION_ID >= ENUM_INTRODUCTION_VERSION_ID) {
    eval("
        enum TestEnum
        {
            case CaseName;
        }
    ");
}

[shadowhand]

Rather than doing an eval, can it be placed into a separate file and included conditionally? I don't want to use eval, even in a test, if it can be helped.

[gordinskiy]

Updated test

[shadowhand]

Thank you!