warning: Conflicting compiler settings were detected. Some settings will be ignored.
Compiler settings for the 2.11 optimizer (-optimise) are incompatible with -Ybackend:GenBCode (which is the default in 2.12).
The optimizer settings are ignored. See -Yopt:help for enabling the new optimizer in 2.12.
error: No warnings can be incurred under -Xfatal-warnings.
one warning found
one error found