4 calls to error_displayable()

_drupal_exception_handler in includes/bootstrap.inc: Provides custom PHP exception handling.
_drupal_log_error in includes/errors.inc: Logs a PHP error or exception and displays an error page in fatal cases.
_drupal_session_write in includes/session.inc: Writes an entire session to the database (internal use only).
_drupal_shutdown_function in includes/bootstrap.inc: Executes registered shutdown functions.

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