vim-patch:7.4.831

Problem:    When expanding `=expr` on the command line and encountering an
            error, the command is executed anyway.
Solution:   Bail out when an error is detected.

3f188935ec

src/nvim/version.c

@@ -459,7 +459,7 @@ static int included_patches[] = {
   834,
   833,
   // 832,
-  // 831,
+  831,
   830,
   // 829 NA
   828,