Eno\Error » message
message → string
Contains both the error text as well as the snippet. This is also what you get in the console when you don't catch the error.
phptry {
// ...
} catch(Error $e) {
$e->message; // returns "In line 4 'a' is copied into itself.\n\n Line | Content\n ..."
}
Return value
Both the error text as well as the snippet.