diff --git a/libguile/backtrace.c b/libguile/backtrace.c
index c2b325ee7..5b2c290f0 100644
--- a/libguile/backtrace.c
+++ b/libguile/backtrace.c
@@ -157,8 +157,7 @@ display_expression (SCM frame,SCM pname,SCM source,SCM port)
   pstate->length = 3;
   if (SCM_ROSTRINGP (pname))
     {
-      if (SCM_NIMP (frame)
-	  && SCM_FRAMEP (frame)
+      if (SCM_FRAMEP (frame)
 	  && SCM_FRAME_EVAL_ARGS_P (frame))
 	scm_puts ("While evaluating arguments to ", port);
       else
@@ -199,7 +198,6 @@ display_error_body (struct display_error_args *a)
   SCM prev_frame = SCM_BOOL_F;
 
   if (SCM_DEBUGGINGP
-      && SCM_NIMP (a->stack)
       && SCM_STACKP (a->stack)
       && SCM_STACK_LENGTH (a->stack) > 0)
     {
diff --git a/libguile/coop-threads.c b/libguile/coop-threads.c
index 95eac02a7..adc2b82d5 100644
--- a/libguile/coop-threads.c
+++ b/libguile/coop-threads.c
@@ -413,7 +413,7 @@ scm_make_mutex (void)
 SCM
 scm_lock_mutex (SCM m)
 {
-  SCM_ASSERT (SCM_NIMP (m) && SCM_MUTEXP (m), m, SCM_ARG1, s_lock_mutex);
+  SCM_ASSERT (SCM_MUTEXP (m), m, SCM_ARG1, s_lock_mutex);
   coop_mutex_lock (SCM_MUTEX_DATA (m));
   return SCM_BOOL_T;
 }
diff --git a/libguile/debug.c b/libguile/debug.c
index 60be1c7c1..b59c9ffa8 100644
--- a/libguile/debug.c
+++ b/libguile/debug.c
@@ -274,8 +274,7 @@ GUILE_PROC (scm_gloc_p, "gloc?", 1, 0, 0,
 "")
 #define FUNC_NAME s_scm_gloc_p
 {
-  return SCM_BOOL((SCM_NIMP (obj)
-                   && SCM_MEMOIZEDP (obj)
+  return SCM_BOOL((SCM_MEMOIZEDP (obj)
                    && (SCM_MEMOIZED_EXP (obj) & 7) == 1));
 }
 #undef FUNC_NAME
@@ -540,10 +539,8 @@ static SCM
 scm_m_start_stack (SCM exp, SCM env)
 {
   exp = SCM_CDR (exp);
-  SCM_ASSERT (SCM_NIMP (exp)
-	      && SCM_ECONSP (exp)
-	      && SCM_NIMP (SCM_CDR (exp))
-	      && SCM_ECONSP (SCM_CDR (exp))
+  SCM_ASSERT (SCM_ECONSP (exp)
+              && SCM_ECONSP (SCM_CDR (exp))
 	      && SCM_NULLP (SCM_CDDR (exp)),
 	      exp,
 	      SCM_WNA,
diff --git a/libguile/dynl-vms.c b/libguile/dynl-vms.c
index ca93c8211..e69de29bb 100644
--- a/libguile/dynl-vms.c
+++ b/libguile/dynl-vms.c
@@ -1,108 +0,0 @@
-/* dynl-vms.c - dynamic linking for VMS, not yet ported
- *
- * Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
- * 
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this software; see the file COPYING.  If not, write to
- * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- * Boston, MA 02111-1307 USA
- *
- * As a special exception, the Free Software Foundation gives permission
- * for additional uses of the text contained in its release of GUILE.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
- *
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE.  If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way.  To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
- *
- * If you write modifications of your own for GUILE, it is your choice
- * whether to permit this exception to apply to your modifications.
- * If you do not wish that, delete this exception notice.  */
-
-/* "dynl.c" dynamically link&load object files.
-   Author: Aubrey Jaffer
-   (Not yet) modified for libguile by Marius Vollmer */
-
-/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
-   gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
-
-/* We should try to implement dynamic-link/dynamic-call for VMS,
-   too. */
-
-#include "_scm.h"
-
-/* This permits dynamic linking. For example, the procedure of 0 arguments
-   from a file could be the initialization procedure.
-   (vms:dynamic-link-call "MYDISK:[MYDIR].EXE" "foo" "INIT_FOO")
-   The first argument specifies the directory where the file specified
-   by the second argument resides.  The current directory would be
-   "SYS$DISK:[].EXE".
-   The second argument cannot contain any punctuation.
-   The third argument probably needs to be uppercased to mimic the VMS linker.
-   */
-
-# include <descrip.h>
-# include <ssdef.h>
-# include <rmsdef.h>
-
-struct dsc$descriptor *descriptorize(x, buff)
-     struct dsc$descriptor *x;
-     SCM buff;
-{(*x).dsc$w_length = LENGTH(buff);
- (*x).dsc$a_pointer = CHARS(buff);
- (*x).dsc$b_class = DSC$K_CLASS_S;
- (*x).dsc$b_dtype = DSC$K_DTYPE_T;
- return(x);}
-
-static char s_dynl[] = "vms:dynamic-link-call";
-SCM dynl(SCM dir, SCM symbol, SCM fname)
-{
-  struct dsc$descriptor fnamed, symbold, dird;
-  void (*fcn)();
-  long retval;
-  ASSERT(IMP(dir) || STRINGP(dir), dir, ARG1, s_dynl);
-  ASSERT(NIMP(fname) && STRINGP(fname), fname, ARG2, s_dynl);
-  ASSERT(NIMP(symbol) && STRINGP(symbol), symbol, ARG3, s_dynl);
-  descriptorize(&fnamed, fname);
-  descriptorize(&symbold, symbol);
-  DEFER_INTS;
-  retval = lib$find_image_symbol(&fnamed, &symbold, &fcn,
-				 IMP(dir) ? 0 : descriptorize(&dird, dir));
-  if (SS$_NORMAL != retval) {
-    /* wta(MAKINUM(retval), "vms error", s_dynl); */
-    ALLOW_INTS;
-    return BOOL_F;
-  }
-  ALLOW_INTS;
-/*  *loc_loadpath = dir; */
-  (*fcn)();
-/*  *loc_loadpath = oloadpath; */
-  return BOOL_T;
-}
-
-void init_dynl()
-{
-  make_subr(s_dynl, tc7_subr_3, dynl);
-}
diff --git a/libguile/eval.c b/libguile/eval.c
index 7468dc3f5..27ac70b9f 100644
--- a/libguile/eval.c
+++ b/libguile/eval.c
@@ -547,7 +547,7 @@ scm_m_set_x (SCM xorig, SCM env)
 {
   SCM x = SCM_CDR (xorig);
   SCM_ASSYNT (2 == scm_ilength (x), xorig, scm_s_expression, scm_s_set_x);
-  SCM_ASSYNT (SCM_NIMP (SCM_CAR (x)) && SCM_SYMBOLP (SCM_CAR (x)),
+  SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (x)),
 	      xorig, scm_s_variable, scm_s_set_x);
   return scm_cons (SCM_IM_SET_X, x);
 }
@@ -3407,8 +3407,7 @@ tail:
       else
 	{
 	  SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED);
-	  while (SCM_NIMP (arg1 = SCM_CDR (arg1))
-		 && SCM_CONSP (arg1))
+	  while (arg1 = SCM_CDR (arg1), SCM_CONSP (arg1))
 	    {
 	      SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1),
 					SCM_UNSPECIFIED));
@@ -3773,7 +3772,7 @@ any other object.")
   ans = tl = scm_cons_source (obj,
 			      scm_copy_tree (SCM_CAR (obj)),
 			      SCM_UNSPECIFIED);
-  while (SCM_NIMP (obj = SCM_CDR (obj)) && SCM_CONSP (obj))
+  while (obj = SCM_CDR (obj), SCM_CONSP (obj))
     {
       SCM_SETCDR (tl, scm_cons (scm_copy_tree (SCM_CAR (obj)),
 				SCM_UNSPECIFIED));