diff --git a/ChangeLog b/ChangeLog
index 73650af2d4..8a73844365 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+Wed Oct 10 03:11:47 2001  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* file.c (rb_stat_clone): should copy internal data too.
+
+	* numeric.c (num_clone): Numeric should not be copied by clone.
+
+	* object.c (rb_obj_clone): should check immediate values.
+
+	* parse.y (command): `yield' should take command_args.
+
+	* parse.y (parse_quotedwords): %w(...) is not a string.
+
 Tue Oct  9 18:40:35 2001  WATANABE Hirofumi  <eban@ruby-lang.org>
 
 	* process.c (Init_process): activate the case NT.
diff --git a/eval.c b/eval.c
index 6fe1124cbb..628758a93a 100644
--- a/eval.c
+++ b/eval.c
@@ -5232,7 +5232,7 @@ rb_obj_instance_eval(argc, argv, self)
     return specific_eval(argc, argv, klass, self);
 }
 
-static VALUE
+VALUE
 rb_mod_module_eval(argc, argv, mod)
     int argc;
     VALUE *argv;
diff --git a/file.c b/file.c
index e9c4edcaa0..c5d41d2f66 100644
--- a/file.c
+++ b/file.c
@@ -395,7 +395,11 @@ group_member(gid)
 
 # ifdef HAVE_GETGROUPS
 #  ifndef NGROUPS
+#   ifdef NGROUPS_MAX
+#    define NGROUPS NGROUPS_MAX
+#   else
 #    define NGROUPS 32
+#   endif
 #  endif
     {
 	GETGROUPS_T gary[NGROUPS];
@@ -1908,6 +1912,25 @@ rb_stat_init(obj, fname)
     return Qnil;
 }
 
+static VALUE
+rb_stat_clone(obj)
+    VALUE obj;
+{
+    struct stat st, *nst;
+
+    VALUE clone;
+
+    clone = rb_obj_alloc(RBASIC(obj)->klass);
+    CLONESETUP(clone,obj);
+    if (DATA_PTR(obj)) {
+	nst = ALLOC(struct stat);
+	*nst = *(struct stat*)DATA_PTR(obj);
+	DATA_PTR(clone) = nst;
+    }
+
+    return clone;
+}
+
 static VALUE
 rb_stat_ftype(obj)
     VALUE obj;
@@ -2509,6 +2532,7 @@ Init_File()
     rb_cStat = rb_define_class_under(rb_cFile, "Stat", rb_cObject);
     rb_define_singleton_method(rb_cStat, "allocate",  rb_stat_s_alloc, 0);
     rb_define_method(rb_cStat, "initialize", rb_stat_init, 1);
+    rb_define_method(rb_cStat, "clone", rb_stat_clone, 0);
 
     rb_include_module(rb_cStat, rb_mComparable);
 
diff --git a/intern.h b/intern.h
index 4ea537c951..eedbab3da4 100644
--- a/intern.h
+++ b/intern.h
@@ -141,6 +141,7 @@ VALUE rb_apply _((VALUE, ID, VALUE));
 void rb_backtrace _((void));
 ID rb_frame_last_func _((void));
 VALUE rb_obj_instance_eval _((int, VALUE*, VALUE));
+VALUE rb_mod_module_eval _((int, VALUE*, VALUE));
 void rb_load _((VALUE, int));
 void rb_load_protect _((VALUE, int, int*));
 NORETURN(void rb_jump_tag _((int)));
diff --git a/numeric.c b/numeric.c
index 9c0f6f31d6..4f11fceec3 100644
--- a/numeric.c
+++ b/numeric.c
@@ -91,8 +91,9 @@ static VALUE
 num_clone(x)
     VALUE x;
 {
-    /* Numerics are immutable values, which need not to copy */
-    return x;
+    /* Numerics are immutable values, which should not be copied */
+    rb_raise(rb_eTypeError, "can't clone %s", rb_class2name(CLASS_OF(x)));
+    return Qnil;		/* not reached */
 }
 
 static VALUE
diff --git a/object.c b/object.c
index e2bc29b065..b2580d9904 100644
--- a/object.c
+++ b/object.c
@@ -94,6 +94,9 @@ rb_obj_clone(obj)
 {
     VALUE clone;
 
+    if (rb_special_const_p(obj)) {
+        rb_raise(rb_eTypeError, "can't clone %s", rb_class2name(CLASS_OF(obj)));
+    }
     clone = rb_obj_alloc(RBASIC(obj)->klass);
     CLONESETUP(clone,obj);
     if (TYPE(clone) == T_OBJECT && ROBJECT(obj)->iv_tbl) {
@@ -587,10 +590,12 @@ rb_mod_cmp(mod, arg)
 }
 
 static VALUE
-rb_mod_initialize(argc, argv)
+rb_mod_initialize(argc, argv, module)
     int argc;
     VALUE *argv;
+    VALUE module;
 {
+    rb_mod_module_eval(0, 0, module);
     return Qnil;
 }
 
diff --git a/parse.y b/parse.y
index e3d0eb8140..d7ed5b5f58 100644
--- a/parse.y
+++ b/parse.y
@@ -208,7 +208,7 @@ static void top_local_setup();
 
 %token <id>   tIDENTIFIER tFID tGVAR tIVAR tCONSTANT tCVAR
 %token <val>  tINTEGER tFLOAT tSTRING tXSTRING tREGEXP
-%token <node> tDSTRING tDXSTRING tDREGEXP tNTH_REF tBACK_REF
+%token <node> tDSTRING tDXSTRING tDREGEXP tNTH_REF tBACK_REF tQWORDS
 
 %type <node> singleton string
 %type <val>  literal numeric
@@ -510,7 +510,7 @@ command		: operation command_args
 			$$ = new_super($2);
 		        fixpos($$, $2);
 		    }
-		| kYIELD call_args
+		| kYIELD command_args
 		    {
 			$$ = NEW_YIELD(ret_args($2));
 		        fixpos($$, $2);
@@ -1163,6 +1163,7 @@ primary		: literal
 		    {
 			$$ = NEW_XSTR($1);
 		    }
+		| tQWORDS
 		| tDXSTRING
 		| tDREGEXP
 		| var_ref
@@ -2742,7 +2743,7 @@ parse_quotedwords(term, paren)
     if (!qwords) qwords = NEW_ZARRAY();
     yylval.node = qwords;
     lex_state = EXPR_END;
-    return tDSTRING;
+    return tQWORDS;
 }
 
 static int