commit https://github.com/vim/vim/commit/a24f0a550fed3d9773800cf6be4efd072fff20ec Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jan 17 19:39:00 2016 +0100 patch 7.4.1123 Problem: Using ":argadd" when there are no arguments results in the second argument to be the current one. (Yegappan Lakshmanan) Solution: Correct the w_arg_idx value.

/* if_tcl.c */
void vim_tcl_init __ARGS((char *arg));
int tcl_enabled __ARGS((int verbose));
void tcl_end __ARGS((void));
void ex_tcl __ARGS((exarg_T *eap));
void ex_tclfile __ARGS((exarg_T *eap));
void ex_tcldo __ARGS((exarg_T *eap));
void tcl_buffer_free __ARGS((buf_T *buf));
void tcl_window_free __ARGS((win_T *win));
/* vim: set ft=c : */