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I noticed that scan.c does not yet support long vectors. It was causing a problem in the rstan library (https://github.com/stan-dev/rstan/issues/530) I was able to patch base R to add long vector support. See the following gist. https://gist.github.com/aaronjg/f39e5966687ca004dab5a10e7655c648 I could not make a bugzilla account, so I am sending the patch here. [[alternative HTML version

I noticed an issue where readChar does not return the correct value after a call to readline. It appears that readChar is not aware of the buffering, so it reads from the end of the buffer, rather than the current position in the file. This is a significant change of behavior from R-3.4.4. Below is a test case that I used to home in on the problem. --- p<-"test2.txt"

Tomas, Thank you for the explanation. I see in the documentation: "These functions are intended to be used with binary-mode connections." So I see how using it on a text connection is undefined, and not a bug. An error or warning when attempting to use a it on a text connection would be helpful considering how the behavior has changed in R-3.5. On Tue, May 29, 2018 at 3:09 AM, Tomas