what if a user carelessly closed all connections?

[yihui]

e.g.

library(evaluate)
evaluate('
1+1
closeAllConnections()
2+2
')

Error in isIncomplete(con) : invalid connection
Warning in sink() : no sink to remove
Error in close.connection(con) : invalid connection

dkahle/ggmap#9 was one example.

Is there way to prevent the connection in evaluate from being closed? https://github.com/hadley/evaluate/blob/master/R/watcher.r#L11

[hadley]

Hmmmm. I guess we could detect that with the parser and at least a more informative error message?

[yihui]

That might be the only thing we can do, since there is no way to recover a connection after it is closed.