vim-patch:7.4.1142

Problem:    Cannot define keyword characters for a syntax file.
Solution:   Add the ":syn iskeyword" command. (Christian Brabandt)

b8060fe862

src/nvim/buffer_defs.h

@@ -447,6 +447,8 @@ typedef struct {
   char_u      *b_p_spf;         /* 'spellfile' */
   char_u      *b_p_spl;         /* 'spelllang' */
   int b_cjk;                    /* all CJK letters as OK */
+  char_u b_syn_chartab[32];     // syntax iskeyword option
+  char_u *b_syn_isk;            // iskeyword option
 } synblock_T;