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  • $\begingroup$ Thanks. I was also notified that this is fixed in 11.2. $\endgroup$ Commented Nov 10, 2017 at 15:44
  • $\begingroup$ Now x /. b_: 0 + x :> -b fails in 11.2 but works in 11.0.1. To get it to work in 11.2 had to add parentheses: x /. (b_: 0) + x :> -b $\endgroup$ Commented Jan 29, 2018 at 16:39