Evaluate a string containing Jsonnet code, return a JSON string.
The returned string should be cleaned up with jsonnet_realloc.
\param filename Path to a file (used in error messages).
\param snippet Jsonnet code to execute.
\param error Return by reference whether or not there was an error.
\returns Either JSON or the error message.
Evaluate a string containing Jsonnet code, return a JSON string.
The returned string should be cleaned up with jsonnet_realloc.
\param filename Path to a file (used in error messages). \param snippet Jsonnet code to execute. \param error Return by reference whether or not there was an error. \returns Either JSON or the error message.