Hopefully an internal error should never happen. ;)

What's an example of an error message return? How would this be handled?

kexo wrote:

Example steps to reproduce behavior (the language java serves as an
example here - this works with any language):

1. In Mediawiki, view or preview a page containing the content '<source

lang="java">{ System.out.println("Test"); }</source>'. Text is
successfully highlighted using GeSHi.

2. On the file system level, deny everybody read access to the

file /extensions/geshi/geshi/java.php (including the account used by the
web server and by PHP).

3. In Mediawiki, reload or preview again the page. The page now contains

the misleading error message "You need to specify a language ..."
(4. Undo step 2 to regain functionality.)

Diagnosis: GeSHi passes a valid error message to SyntaxHighlight.php: In
SyntaxHighlight.php, in method syntaxFormat, the error message is
retrieved (call to $geshi->error()) and SyntaxHighlight.php stores this
message in variable $error. Then, SyntaxHighlight.php passes the value of
the variable $error to the function syntaxHelp, but the latter method
fails to output the value of this (optional) parameter or to do anything
with it.

If you have to break your own server, well... Hardly seems
like an issue?