Returns the error state of functions that support it. C-Developers note that this
is similar to
errno under Linux. The error state corresponds to the function
immediately called before. The next function call overrides it.
Right now, the value 0 means that that the previous functions succeeded, any other value that it failed. In the future, we may have more fine-grain error codes.
Function descriptions mention if a function supports error state information. If not,
the function call will always set
script_error() to 0.
The following example shows that script_error() only needs to be called and does not need any parameters.
Help with configuring/using