patch 8.1.0661: clipboard regexp might be used recursively
Problem: Clipboard regexp might be used recursively.
Solution: Check for recursive use and bail out.
diff --git a/src/proto/regexp.pro b/src/proto/regexp.pro
index d22a83b..a33fdd9 100644
--- a/src/proto/regexp.pro
+++ b/src/proto/regexp.pro
@@ -13,6 +13,7 @@
list_T *reg_submatch_list(int no);
regprog_T *vim_regcomp(char_u *expr_arg, int re_flags);
void vim_regfree(regprog_T *prog);
+int regprog_in_use(regprog_T *prog);
int vim_regexec_prog(regprog_T **prog, int ignore_case, char_u *line, colnr_T col);
int vim_regexec(regmatch_T *rmp, char_u *line, colnr_T col);
int vim_regexec_nl(regmatch_T *rmp, char_u *line, colnr_T col);