How to make warning into error?

General Usage
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5

Julia doesn’t “throw” warnings. However, warning messages are typically written to the stderr stream, so you can turn such warnings to errors simply by redirecting stderr to a read-only stream:

julia> redirect_stderr(open(touch(tempname()), "r"))
IOStream(<file ...>)

julia> @warn "foo"
ERROR: ArgumentError: write failed, IOStream is not writeable

Originally posted by @stevengj in Terminate after warning is thrown - global setting -#2 by stevengj

Or, you can install a custom logger that turns warnings into errors:

julia> using Logging, LoggingExtras

julia> error_on_warning = EarlyFilteredLogger(global_logger()) do log_args
           if log_args.level >= Logging.Warn
               error(log_args)
           end
           return true
       end;

julia> global_logger(error_on_warning);

Adapted from @fredrikekre’s answer here

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