@Override
        public StandardRegionalEndpointsTrait build() {
            return new StandardRegionalEndpointsTrait(this);
        }
Sets the list of region special cases for a region.

@param region the region to use
@param regionSpecialCases Map of region string to list of {@link RegionSpecialCase}
@return Returns the builder.
smithy-aws-endpoints/src/main/java/software/amazon/smithy/rulesengine/aws/traits/StandardRegionalEndpointsTrait.java