patch 8.2.2806: Vim9: using "++nr" as a command might not work
Problem: Vim9: using "++nr" as a command might not work.
Solution: Do not recognize "++" and "--" in a following line as addition or
subtraction.
diff --git a/src/vim9script.c b/src/vim9script.c
index ddbae78..02c04e2 100644
--- a/src/vim9script.c
+++ b/src/vim9script.c
@@ -160,6 +160,28 @@
#if defined(FEAT_EVAL) || defined(PROTO)
/*
+ * "++nr" and "--nr" commands.
+ */
+ void
+ex_incdec(exarg_T *eap)
+{
+ char_u *cmd = eap->cmd;
+ size_t len = STRLEN(eap->cmd) + 6;
+
+ // This works like "nr += 1" or "nr -= 1".
+ eap->cmd = alloc(len);
+ if (eap->cmd == NULL)
+ return;
+ vim_snprintf((char *)eap->cmd, len, "%s %c= 1", cmd + 2,
+ eap->cmdidx == CMD_increment ? '+' : '-');
+ eap->arg = eap->cmd;
+ eap->cmdidx = CMD_var;
+ ex_let(eap);
+ vim_free(eap->cmd);
+ eap->cmd = cmd;
+}
+
+/*
* ":export let Name: type"
* ":export const Name: type"
* ":export def Name(..."