diff --git a/moo/kernel/Collect.moo b/moo/kernel/Collect.moo
index 1623d85..7bd4286 100644
--- a/moo/kernel/Collect.moo
+++ b/moo/kernel/Collect.moo
@@ -123,11 +123,22 @@ class(#byte) ByteArray(Collection)
 class Set(Collection)
 {
 	dcl tally bucket.
-	
+
+	method new: size
+	{
+		^self new initialize: size.
+	}
+
 	method initialize
 	{
+		^self initialize: 128. (* TODO: default initial size *)
+	}
+
+	method initialize: size
+	{
+		(size <= 0) ifTrue: [size := 2].
 		self.tally := 0.
-		self.bucket := Array new: 128.  (* TODO: initial size *)
+		self.bucket := Array new: size.
 	}
 
 	method size
diff --git a/moo/kernel/Moo.moo b/moo/kernel/Moo.moo
index 7716ec3..244adc0 100644
--- a/moo/kernel/Moo.moo
+++ b/moo/kernel/Moo.moo
@@ -7,6 +7,7 @@
 #include 'Collect.moo'.
 #include 'Process.moo'.
 
+(* -------------------------------------------------------------------------- *)
 
 class FFI(Object)
 {
@@ -78,9 +79,7 @@ f isNil ifTrue: [ self error: 'No such function' ].
 	}
 }
 
-
-
-#########################################################################################
+(* -------------------------------------------------------------------------- *)
 
 #include 'Stdio.moo'.
 #include 'Console.moo'.
diff --git a/moo/kernel/generr.moo b/moo/kernel/generr.moo
index 7341ff8..7f871a4 100644
--- a/moo/kernel/generr.moo
+++ b/moo/kernel/generr.moo
@@ -80,7 +80,6 @@ class MyObject(Object)
 			'duplicate temporary variable name'
 			'duplicate variable name'
 			'duplicate block argument name'
-			'cannot assign to argument'
 			'undeclared variable'
 			'unusable variable in compiled code'
 			'inaccessible variable'
diff --git a/moo/lib/comp.c b/moo/lib/comp.c
index 407f4b9..15823c0 100644
--- a/moo/lib/comp.c
+++ b/moo/lib/comp.c
@@ -4270,8 +4270,8 @@ static int compile_method_expression (moo_t* moo, int pop)
 			if (compile_method_expression(moo, 0) <= -1) goto oops;
 
 			/* compile_method_expression() is called after clone_assignee().
-			 * clone_assignee() may reallocate a single buffer to hold 
-			 * a series of assigness names. the pointer based operation is
+			 * clone_assignee() may reallocate a single buffer that holds 
+			 * a series of assigness names. this pointer based operation is
 			 * fragile as it can change. use the offset of the cloned
 			 * assignee to update the actual pointer after the recursive
 			 * compile_method_expression() call */
@@ -4280,11 +4280,7 @@ static int compile_method_expression (moo_t* moo, int pop)
 
 			switch (var.type)
 			{
-				case VAR_ARGUMENT:
-					/* assigning to an argument is not allowed */
-					set_syntax_error (moo, MOO_SYNERR_VARARG, &assignee_loc, &assignee);
-					goto oops;
-
+				case VAR_ARGUMENT: /* TODO: consider if assigning to an argument should be disallowed */
 				case VAR_TEMPORARY:
 				{
 				#if defined(MOO_USE_CTXTEMPVAR)
diff --git a/moo/lib/err.c b/moo/lib/err.c
index d00840b..2e908a3 100644
--- a/moo/lib/err.c
+++ b/moo/lib/err.c
@@ -98,32 +98,31 @@ static moo_ooch_t synerrstr_27[] = {'u','n','d','e','f','i','n','e','d',' ','c',
 static moo_ooch_t synerrstr_28[] = {'d','u','p','l','i','c','a','t','e',' ','c','l','a','s','s','\0'};
 static moo_ooch_t synerrstr_29[] = {'c','o','n','t','r','a','d','i','c','t','o','r','y',' ','c','l','a','s','s',' ','d','e','f','i','n','i','t','i','o','n','\0'};
 static moo_ooch_t synerrstr_30[] = {'w','r','o','n','g',' ','c','l','a','s','s',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_31[] = {'#','d','c','l',' ','n','o','t',' ','a','l','l','o','w','e','d','\0'};
+static moo_ooch_t synerrstr_31[] = {'d','c','l',' ','n','o','t',' ','a','l','l','o','w','e','d','\0'};
 static moo_ooch_t synerrstr_32[] = {'w','r','o','n','g',' ','m','e','t','h','o','d',' ','n','a','m','e','\0'};
 static moo_ooch_t synerrstr_33[] = {'d','u','p','l','i','c','a','t','e',' ','m','e','t','h','o','d',' ','n','a','m','e','\0'};
 static moo_ooch_t synerrstr_34[] = {'d','u','p','l','i','c','a','t','e',' ','a','r','g','u','m','e','n','t',' ','n','a','m','e','\0'};
 static moo_ooch_t synerrstr_35[] = {'d','u','p','l','i','c','a','t','e',' ','t','e','m','p','o','r','a','r','y',' ','v','a','r','i','a','b','l','e',' ','n','a','m','e','\0'};
 static moo_ooch_t synerrstr_36[] = {'d','u','p','l','i','c','a','t','e',' ','v','a','r','i','a','b','l','e',' ','n','a','m','e','\0'};
 static moo_ooch_t synerrstr_37[] = {'d','u','p','l','i','c','a','t','e',' ','b','l','o','c','k',' ','a','r','g','u','m','e','n','t',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_38[] = {'c','a','n','n','o','t',' ','a','s','s','i','g','n',' ','t','o',' ','a','r','g','u','m','e','n','t','\0'};
-static moo_ooch_t synerrstr_39[] = {'u','n','d','e','c','l','a','r','e','d',' ','v','a','r','i','a','b','l','e','\0'};
-static moo_ooch_t synerrstr_40[] = {'u','n','u','s','a','b','l','e',' ','v','a','r','i','a','b','l','e',' ','i','n',' ','c','o','m','p','i','l','e','d',' ','c','o','d','e','\0'};
-static moo_ooch_t synerrstr_41[] = {'i','n','a','c','c','e','s','s','i','b','l','e',' ','v','a','r','i','a','b','l','e','\0'};
-static moo_ooch_t synerrstr_42[] = {'a','m','b','i','g','u','o','u','s',' ','v','a','r','i','a','b','l','e','\0'};
-static moo_ooch_t synerrstr_43[] = {'w','r','o','n','g',' ','e','x','p','r','e','s','s','i','o','n',' ','p','r','i','m','a','r','y','\0'};
-static moo_ooch_t synerrstr_44[] = {'t','o','o',' ','m','a','n','y',' ','t','e','m','p','o','r','a','r','i','e','s','\0'};
-static moo_ooch_t synerrstr_45[] = {'t','o','o',' ','m','a','n','y',' ','a','r','g','u','m','e','n','t','s','\0'};
-static moo_ooch_t synerrstr_46[] = {'t','o','o',' ','m','a','n','y',' ','b','l','o','c','k',' ','t','e','m','p','o','r','a','r','i','e','s','\0'};
-static moo_ooch_t synerrstr_47[] = {'t','o','o',' ','m','a','n','y',' ','b','l','o','c','k',' ','a','r','g','u','m','e','n','t','s','\0'};
-static moo_ooch_t synerrstr_48[] = {'t','o','o',' ','l','a','r','g','e',' ','b','l','o','c','k','\0'};
-static moo_ooch_t synerrstr_49[] = {'w','r','o','n','g',' ','p','r','i','m','i','t','i','v','e',' ','f','u','n','c','t','i','o','n',' ','n','u','m','b','e','r','\0'};
-static moo_ooch_t synerrstr_50[] = {'w','r','o','n','g',' ','p','r','i','m','i','t','i','v','e',' ','f','u','n','c','t','i','o','n',' ','i','d','e','n','t','i','f','i','e','r','\0'};
-static moo_ooch_t synerrstr_51[] = {'w','r','o','n','g',' ','m','o','d','u','l','e',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_52[] = {'#','i','n','c','l','u','d','e',' ','e','r','r','o','r','\0'};
-static moo_ooch_t synerrstr_53[] = {'w','r','o','n','g',' ','n','a','m','e','s','p','a','c','e',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_54[] = {'w','r','o','n','g',' ','p','o','o','l',' ','d','i','c','t','i','o','n','a','r','y',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_55[] = {'d','u','p','l','i','c','a','t','e',' ','p','o','o','l',' ','d','i','c','t','i','o','n','a','r','y',' ','n','a','m','e','\0'};
-static moo_ooch_t synerrstr_56[] = {'l','i','t','e','r','a','l',' ','e','x','p','e','c','t','e','d','\0'};
+static moo_ooch_t synerrstr_38[] = {'u','n','d','e','c','l','a','r','e','d',' ','v','a','r','i','a','b','l','e','\0'};
+static moo_ooch_t synerrstr_39[] = {'u','n','u','s','a','b','l','e',' ','v','a','r','i','a','b','l','e',' ','i','n',' ','c','o','m','p','i','l','e','d',' ','c','o','d','e','\0'};
+static moo_ooch_t synerrstr_40[] = {'i','n','a','c','c','e','s','s','i','b','l','e',' ','v','a','r','i','a','b','l','e','\0'};
+static moo_ooch_t synerrstr_41[] = {'a','m','b','i','g','u','o','u','s',' ','v','a','r','i','a','b','l','e','\0'};
+static moo_ooch_t synerrstr_42[] = {'w','r','o','n','g',' ','e','x','p','r','e','s','s','i','o','n',' ','p','r','i','m','a','r','y','\0'};
+static moo_ooch_t synerrstr_43[] = {'t','o','o',' ','m','a','n','y',' ','t','e','m','p','o','r','a','r','i','e','s','\0'};
+static moo_ooch_t synerrstr_44[] = {'t','o','o',' ','m','a','n','y',' ','a','r','g','u','m','e','n','t','s','\0'};
+static moo_ooch_t synerrstr_45[] = {'t','o','o',' ','m','a','n','y',' ','b','l','o','c','k',' ','t','e','m','p','o','r','a','r','i','e','s','\0'};
+static moo_ooch_t synerrstr_46[] = {'t','o','o',' ','m','a','n','y',' ','b','l','o','c','k',' ','a','r','g','u','m','e','n','t','s','\0'};
+static moo_ooch_t synerrstr_47[] = {'t','o','o',' ','l','a','r','g','e',' ','b','l','o','c','k','\0'};
+static moo_ooch_t synerrstr_48[] = {'w','r','o','n','g',' ','p','r','i','m','i','t','i','v','e',' ','f','u','n','c','t','i','o','n',' ','n','u','m','b','e','r','\0'};
+static moo_ooch_t synerrstr_49[] = {'w','r','o','n','g',' ','p','r','i','m','i','t','i','v','e',' ','f','u','n','c','t','i','o','n',' ','i','d','e','n','t','i','f','i','e','r','\0'};
+static moo_ooch_t synerrstr_50[] = {'w','r','o','n','g',' ','m','o','d','u','l','e',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_51[] = {'#','i','n','c','l','u','d','e',' ','e','r','r','o','r','\0'};
+static moo_ooch_t synerrstr_52[] = {'w','r','o','n','g',' ','n','a','m','e','s','p','a','c','e',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_53[] = {'w','r','o','n','g',' ','p','o','o','l',' ','d','i','c','t','i','o','n','a','r','y',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_54[] = {'d','u','p','l','i','c','a','t','e',' ','p','o','o','l',' ','d','i','c','t','i','o','n','a','r','y',' ','n','a','m','e','\0'};
+static moo_ooch_t synerrstr_55[] = {'l','i','t','e','r','a','l',' ','e','x','p','e','c','t','e','d','\0'};
 static moo_ooch_t* synerrstr[] =
 {
 	synerrstr_0, synerrstr_1, synerrstr_2, synerrstr_3, synerrstr_4, synerrstr_5, synerrstr_6, synerrstr_7,
@@ -132,9 +131,9 @@ static moo_ooch_t* synerrstr[] =
 	synerrstr_24, synerrstr_25, synerrstr_26, synerrstr_27, synerrstr_28, synerrstr_29, synerrstr_30, synerrstr_31,
 	synerrstr_32, synerrstr_33, synerrstr_34, synerrstr_35, synerrstr_36, synerrstr_37, synerrstr_38, synerrstr_39,
 	synerrstr_40, synerrstr_41, synerrstr_42, synerrstr_43, synerrstr_44, synerrstr_45, synerrstr_46, synerrstr_47,
-	synerrstr_48, synerrstr_49, synerrstr_50, synerrstr_51, synerrstr_52, synerrstr_53, synerrstr_54, synerrstr_55,
-	synerrstr_56 
+	synerrstr_48, synerrstr_49, synerrstr_50, synerrstr_51, synerrstr_52, synerrstr_53, synerrstr_54, synerrstr_55
 };
+
 #endif
 /* END: GENERATED WITH generr.st */
 
diff --git a/moo/lib/moo.h b/moo/lib/moo.h
index 0503997..951f85c 100644
--- a/moo/lib/moo.h
+++ b/moo/lib/moo.h
@@ -1104,7 +1104,6 @@ enum moo_synerrnum_t
 	MOO_SYNERR_TMPRNAMEDUP,   /* duplicate temporary variable name */
 	MOO_SYNERR_VARNAMEDUP,    /* duplicate variable name */
 	MOO_SYNERR_BLKARGNAMEDUP, /* duplicate block argument name */
-	MOO_SYNERR_VARARG,        /* cannot assign to argument */
 	MOO_SYNERR_VARUNDCL,      /* undeclared variable */
 	MOO_SYNERR_VARUNUSE,      /* unsuable variable in compiled code */
 	MOO_SYNERR_VARINACC,      /* inaccessible variable - e.g. accessing an instance variable from a class method is not allowed. */