In FunnelWeb, all error messages commence with an indicator indicating the severity of the error message. Here are some of the formats that I investigated before settling on the final format:
W--Error creating sloth. E--Error opening output file. S--I'm a teapot. F--Can't open output file. W-Error creating sloth. E-Error opening output file. S-I'm a teapot. F-Can't open output file. W:Error creating sloth. E:Error opening output file. S:I'm a teapot. F:Can't open output file. W: Error creating sloth. -- Format chosen. E: Error opening output file. S: I'm a teapot. F: Can't open output file. War-Error creating sloth. Err-Error opening output file. Sev-I'm a teapot. Fat-Can't open output file. W-Old fashioned feature. W-Old fashioned feature. W--Old fashioned feature. W: Old fashioned feature. W:Old fashioned feature.