Process completed with exit code 2.

variable "b" is unused (if the variable is not meant to be used, prefix it with an underscore)

variable "a" is unused (if the variable is not meant to be used, prefix it with an underscore)

variable "module" is unused (there is a variable with the same name in the context, use the pin operator (^) to match on it or prefix this variable with underscore if it is not meant to be used)