Opens a connection
rscontract_open(x)
An rscontract_ide object, or an object coercible to an rscontract_ide
Returns a NULL object. If using the RStudio IDE, it will attempt to open the connection, and set the identification using the `host` and `type` argument values
# NOT RUN { rscontract_open(rscontract_spec()) rscontract_close("spec_host", "spec_type") # }
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