# File lib/dbi.rb, line 165
165:         def trace(mode=nil, output=nil)
166:             # FIXME trace
167:             raise InterfaceError, "the trace module has been removed until it actually works."
168:             @@trace_mode   = mode   || @@trace_mode   || DBI::DEFAULT_TRACE_MODE
169:             @@trace_output = output || @@trace_output || DBI::DEFAULT_TRACE_OUTPUT
170:         end