in tcl_cmds.c [1488:1495]
int cmd_abort(ClientData cd, Tcl_Interp *ixx, int objc, Tcl_Obj *CONST objv[]) { if (objc == 2) { Tcl_AddObjErrorInfo(interp, Tcl_GetString(objv[1]), -1); } return TCL_ERROR; }