diff --git a/moo/kernel/Mill.moo b/moo/kernel/Mill.moo
index 9eda1de..5b18f17 100644
--- a/moo/kernel/Mill.moo
+++ b/moo/kernel/Mill.moo
@@ -192,14 +192,15 @@ class MyObject(Object)
 			a dump.
 		}.
 		a dump.
+		
 		a := 5.
-	do {
-		a := do {
-			('in loop.....' & a asString) dump.
-			##if (a > 5) { break }.
-			a := a + 1.
-		} while(a < 10).
-	} while (false).
+		do {
+			a := do {
+				('in loop.....' & a asString) dump.
+				##if (a > 5) { break }.
+				a := a + 1.
+			} while(a < 10).
+		} while (false).
 		a dump.
 
 		## these should be elimited by the compiler.
@@ -213,6 +214,24 @@ class MyObject(Object)
 		nil.
 		## end of elimination.
 
+		a :=999.
+		a := #{ 
+			1, 
+			2,
+			a,
+			4,
+			1 + 1,
+			2 + 2
+		}.
+		a do: [ :v | v dump].
+
+(*
+		## how to handle return inside 'if' like the following???
+		## what happens to the stack?
+		a := if ((k := 20) == 10) {99} else { 100}.
+		k dump.
+		a dump.
+*)
 		'---------- END ------------' dump.
 		##Processor sleepFor: 20.
 	}
diff --git a/moo/kernel/generr.moo b/moo/kernel/generr.moo
index c0d219f..cc936cd 100644
--- a/moo/kernel/generr.moo
+++ b/moo/kernel/generr.moo
@@ -90,6 +90,7 @@ class MyObject(Object)
 			'too many block temporaries'
 			'too many block arguments'
 			'too large block'
+			'too large array expression'
 			'wrong primitive function number'
 			'wrong primitive function identifier'
 			'wrong module name'
diff --git a/moo/lib/comp.c b/moo/lib/comp.c
index cd37b8a..9531cac 100644
--- a/moo/lib/comp.c
+++ b/moo/lib/comp.c
@@ -40,6 +40,8 @@
 #define NAMESPACE_SIZE 128 /* TODO: choose the right size */
 #define POOL_DICTIONARY_SIZE_ALIGN 128
 
+#define INVALID_IP MOO_TYPE_MAX(moo_oow_t)
+
 enum class_mod_t
 {
 	CLASS_INDEXED   = (1 << 0)
@@ -957,7 +959,10 @@ static int get_ident (moo_t* moo, moo_ooci_t char_read_ahead)
 		if (moo->c->in_array && is_leadidentchar(c)) 
 		{
 			/* when reading an array literal, read as many characters as
-			 * would compose a normal keyword symbol literal */
+			 * would compose a normal keyword symbol literal.
+			 * for example, in #(a #b:c: x:y:) x:y: is not preceded
+			 * by #. in an array literal, it should still be treated as 
+			 * a symbol. */
 			do
 			{
 				ADD_TOKEN_CHAR (moo, c);
@@ -1564,9 +1569,9 @@ retry:
 					return -1;
 
 				case '(':
-					/* #( */
+					/* #( - array literal */
 					ADD_TOKEN_CHAR(moo, c);
-					SET_TOKEN_TYPE (moo, MOO_IOTOK_ARPAREN);
+					SET_TOKEN_TYPE (moo, MOO_IOTOK_APAREN);
 					break;
 
 				case '[':
@@ -1575,6 +1580,12 @@ retry:
 					SET_TOKEN_TYPE (moo, MOO_IOTOK_BAPAREN);
 					break;
 
+				case '{':
+					/* #{ - array expression */
+					ADD_TOKEN_CHAR(moo, c);
+					SET_TOKEN_TYPE (moo, MOO_IOTOK_ABRACE);
+					break;
+
 				case '\'':
 					/* quoted symbol literal */
 					GET_CHAR (moo);
@@ -1999,10 +2010,13 @@ static int emit_single_param_instruction (moo_t* moo, int cmd, moo_oow_t param_1
 		case BCODE_PUSH_INTLIT:
 		case BCODE_PUSH_NEGINTLIT:
 		case BCODE_PUSH_CHARLIT:
+		case BCODE_MAKE_ARRAY:
+		case BCODE_POP_INTO_ARRAY:
 			bc = cmd;
 			goto write_long;
 	}
 
+	MOO_DEBUG1 (moo, "Invalid single param instruction opcode %d\n", (int)cmd);
 	moo->errnum = MOO_EINVAL;
 	return -1;
 
@@ -2059,6 +2073,7 @@ static int emit_double_param_instruction (moo_t* moo, int cmd, moo_oow_t param_1
 			goto write_long;
 	}
 
+	MOO_DEBUG1 (moo, "Invalid double param instruction opcode %d\n", (int)cmd);
 	moo->errnum = MOO_EINVAL;
 	return -1;
 
@@ -3798,6 +3813,7 @@ static int __read_array_literal (moo_t* moo, moo_oop_t* xlit)
 				lit = moo_makesymbol (moo, TOKEN_NAME_PTR(moo) + 1, TOKEN_NAME_LEN(moo) - 1);
 				break;
 
+/*
 			case MOO_IOTOK_IDENT:
 			case MOO_IOTOK_IDENT_DOTTED:
 			case MOO_IOTOK_BINSEL:
@@ -3806,8 +3822,38 @@ static int __read_array_literal (moo_t* moo, moo_oop_t* xlit)
 			case MOO_IOTOK_SUPER:
 			case MOO_IOTOK_THIS_CONTEXT:
 			case MOO_IOTOK_THIS_PROCESS:
+			case MOO_IOTOK_DO:
+			case MOO_IOTOK_WHILE:
+			case MOO_IOTOK_BREAK:
+			case MOO_IOTOK_CONTINUE:
+			case MOO_IOTOK_IF:
+			case MOO_IOTOK_ELSE:
+			case MOO_IOTOK_ELSIF:
 				lit = moo_makesymbol (moo, TOKEN_NAME_PTR(moo), TOKEN_NAME_LEN(moo));
 				break;
+*/
+/*		
+a := #(1 2 3 self 5)
+a := #(1 2 3 #(1 2 3) self)
+
+a := #(1, 2, 3, self, 5) <---- is array constant? is array non constant?
+if array constant contains a comma, produce MAKE_ARRAY
+if array literal contains no comma, it's just a literal array.
+what to do with a single element array? no problem if the element is still a literal.
+should i allow expression or something like that here???
+
+#(( abc ))
+
+#(1, 2)
+* 
+
+make array 10.
+push 10
+put array at 1.
+push 20
+put array at 2
+if index is too large, switch to at:put? (or don't care as it's too large???).
+*/
 
 			case MOO_IOTOK_NIL:
 				lit = moo->_nil;
@@ -3821,16 +3867,16 @@ static int __read_array_literal (moo_t* moo, moo_oop_t* xlit)
 				lit = moo->_false;
 				break;
 
-			case MOO_IOTOK_ERROR:
+			case MOO_IOTOK_ERROR: /* error */
 				lit = MOO_ERROR_TO_OOP(MOO_EGENERIC);
 				break;
 
-			case MOO_IOTOK_ERRLIT:
+			case MOO_IOTOK_ERRLIT: /* error(X) */
 				lit = string_to_error (moo, TOKEN_NAME(moo));
 				break;
 
-			case MOO_IOTOK_ARPAREN: /* #( */
-			case MOO_IOTOK_LPAREN: /* ( */
+			case MOO_IOTOK_APAREN: /* #( */
+			/*case MOO_IOTOK_LPAREN:*/ /* ( */
 				saved_arlit_count = moo->c->mth.arlit_count;
 /* TODO: get rid of recursion?? */
 				GET_TOKEN (moo);
@@ -3839,7 +3885,7 @@ static int __read_array_literal (moo_t* moo, moo_oop_t* xlit)
 				break;
 
 			case MOO_IOTOK_BAPAREN: /* #[ */
-			case MOO_IOTOK_LBRACK: /* [ */
+			/*case MOO_IOTOK_LBRACK:*/ /* [ */
 				GET_TOKEN (moo);
 				if (__read_byte_array_literal (moo, &lit) <= -1) return -1;
 				break;
@@ -3928,6 +3974,63 @@ static int compile_array_literal (moo_t* moo)
 	return 0;
 }
 
+static int compile_array_expression (moo_t* moo)
+{
+	moo_oow_t maip;
+	moo_ioloc_t aeloc;
+
+	MOO_ASSERT (moo, TOKEN_TYPE(moo) == MOO_IOTOK_ABRACE);
+
+	maip = moo->c->mth.code.len;
+	if (emit_single_param_instruction(moo, BCODE_MAKE_ARRAY, 0) <= -1) return -1;
+
+	aeloc = *TOKEN_LOC(moo);
+	GET_TOKEN (moo); /* read a token after #{ */
+	if (TOKEN_TYPE(moo) != MOO_IOTOK_RPAREN)
+	{
+		moo_oow_t index;
+
+		index = 0;
+		do
+		{
+/* TODO: check if index exceeds the index that the BCODE_POP_INTO_ARRAY and BCODE_MAKE_ARRAY can support */
+			if (compile_method_expression (moo, 0) <= -1) return -1;
+			if (emit_single_param_instruction (moo, BCODE_POP_INTO_ARRAY, index) <= -1) return -1;
+			index++;
+
+			if (index > MAX_CODE_PARAM)
+			{
+				set_syntax_error (moo, MOO_SYNERR_ARREXPFLOOD, &aeloc, MOO_NULL);
+				return -1;
+			}
+
+			if (TOKEN_TYPE(moo) == MOO_IOTOK_RBRACE) break;
+
+			if (TOKEN_TYPE(moo) != MOO_IOTOK_COMMA)
+			{
+				set_syntax_error (moo, MOO_SYNERR_COMMA, TOKEN_LOC(moo), TOKEN_NAME(moo));
+				return -1;
+			}
+
+			GET_TOKEN (moo);
+		} 
+		while (1);
+
+	/* TODO: devise a double_param MAKE_ARRAY to increase the number of elementes supported... */
+		/* patch the MAKE_ARRAY instruction */
+	#if (MOO_BCODE_LONG_PARAM_SIZE == 2)
+		moo->c->mth.code.ptr[maip + 1] = index >> 8;
+		moo->c->mth.code.ptr[maip + 2] = index & 0xFF;
+	#else
+		moo->c->mth.code.ptr[maip + 1] = index;
+	#endif
+
+	}
+
+	GET_TOKEN (moo); /* read a token after } */
+	return 0;
+}
+
 static int compile_expression_primary (moo_t* moo, const moo_oocs_t* ident, const moo_ioloc_t* ident_loc, int ident_dotted, int* to_super)
 {
 	/*
@@ -4121,12 +4224,14 @@ static int compile_expression_primary (moo_t* moo, const moo_oocs_t* ident, cons
 				if (compile_byte_array_literal(moo) <= -1) return -1;
 				break;
 
-			case MOO_IOTOK_ARPAREN: /* #( */
+			case MOO_IOTOK_APAREN: /* #( */
 				/*GET_TOKEN (moo);*/
 				if (compile_array_literal(moo) <= -1) return -1;
 				break;
 
-			/* TODO: dynamic array, non constant array #<> or #{} or what is a better bracket? */
+			case MOO_IOTOK_ABRACE: /* #{ */
+				if (compile_array_expression(moo) <= -1) return -1;
+				break;
 
 			case MOO_IOTOK_LBRACK: /* [ */
 			{
@@ -4520,7 +4625,11 @@ static int compile_conditional (moo_t* moo)
 	}
 
 	GET_TOKEN (moo);
+
+	/* a weird expression like this is also allowed for the call to  compile_method_expression() 
+	 *   if (if (a == 10) { ^20 }) { ^40 }. */
 	if (compile_method_expression(moo, 0) <= -1) return -1;
+
 	if (TOKEN_TYPE(moo) != MOO_IOTOK_RPAREN)
 	{
 		set_syntax_error (moo, MOO_SYNERR_LPAREN, TOKEN_LOC(moo), TOKEN_NAME(moo));
@@ -4530,8 +4639,6 @@ static int compile_conditional (moo_t* moo)
 	return 0;
 }
 
-#define INVALID_IP MOO_TYPE_MAX(moo_oow_t)
-
 static int compile_if_expression (moo_t* moo)
 {
 	moo_oow_pool_t jumptoend;
@@ -4876,9 +4983,11 @@ oops:
 static int compile_method_expression (moo_t* moo, int pop)
 {
 	/*
-	 * method-expression := method-assignment-expression | basic-expression | if-expression
+	 * method-expression := method-assignment-expression | basic-expression | if-expression | while-expression | do-while-expression
 	 * method-assignment-expression := identifier ":=" method-expression
 	 * if-expression := if ( ) {  } elsif { } else { }
+	 * while-expression := while () {}
+	 * do-while-expression := do { } while ()
 	 */
 
 	moo_oocs_t assignee;
@@ -6144,11 +6253,11 @@ static int __compile_pooldic_definition (moo_t* moo)
 				if (!lit) return -1;
 				goto add_literal;
 
-			case MOO_IOTOK_BAPAREN: /* #[ - byte array parenthesis */
+			case MOO_IOTOK_BAPAREN: /* #[ - byte array literal parenthesis */
 				if (read_byte_array_literal(moo, &lit) <= -1) return -1;
 				goto add_literal;
 
-			case MOO_IOTOK_ARPAREN: /* #( - array parenthesis */
+			case MOO_IOTOK_APAREN: /* #( - array literal parenthesis */
 				if (read_array_literal(moo, &lit) <= -1) return -1;
 				goto add_literal;
 
diff --git a/moo/lib/decode.c b/moo/lib/decode.c
index d3d4374..06d96dc 100644
--- a/moo/lib/decode.c
+++ b/moo/lib/decode.c
@@ -488,6 +488,16 @@ int moo_decode (moo_t* moo, moo_oop_method_t mth, const moo_oocs_t* classfqn)
 				break;
 			/* -------------------------------------------------------- */
 
+			case BCODE_MAKE_ARRAY:
+				FETCH_PARAM_CODE_TO (moo, b1);
+				LOG_INST_1 (moo, "make_array %zu", b1);
+				break;
+
+			case BCODE_POP_INTO_ARRAY:
+				FETCH_PARAM_CODE_TO (moo, b1);
+				LOG_INST_1 (moo, "pop_into_array %zu", b1);
+				break;
+
 			case BCODE_DUP_STACKTOP:
 				LOG_INST_0 (moo, "dup_stacktop");
 				break;
diff --git a/moo/lib/err.c b/moo/lib/err.c
index 1d6754b..539fe3f 100644
--- a/moo/lib/err.c
+++ b/moo/lib/err.c
@@ -116,17 +116,18 @@ static moo_ooch_t synerrstr_44[] = {'t','o','o',' ','m','a','n','y',' ','a','r',
 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_56[] = {'b','r','e','a','k',' ','o','r',' ','c','o','n','t','i','n','u','e',' ','n','o','t',' ','w','i','t','h','i','n',' ','a',' ','l','o','o','p','\0'};
-static moo_ooch_t synerrstr_57[] = {'b','r','e','a','k',' ','o','r',' ','c','o','n','t','i','n','u','e',' ','w','i','t','h','i','n',' ','a',' ','b','l','o','c','k','\0'};
-static moo_ooch_t synerrstr_58[] = {'w','h','i','l','e',' ','e','x','p','e','c','t','e','d','\0'};
+static moo_ooch_t synerrstr_48[] = {'t','o','o',' ','l','a','r','g','e',' ','a','r','r','a','y',' ','e','x','p','r','e','s','s','i','o','n','\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_57[] = {'b','r','e','a','k',' ','o','r',' ','c','o','n','t','i','n','u','e',' ','n','o','t',' ','w','i','t','h','i','n',' ','a',' ','l','o','o','p','\0'};
+static moo_ooch_t synerrstr_58[] = {'b','r','e','a','k',' ','o','r',' ','c','o','n','t','i','n','u','e',' ','w','i','t','h','i','n',' ','a',' ','b','l','o','c','k','\0'};
+static moo_ooch_t synerrstr_59[] = {'w','h','i','l','e',' ','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,
@@ -136,7 +137,7 @@ static moo_ooch_t* synerrstr[] =
 	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_57, synerrstr_58 
+	synerrstr_56, synerrstr_57, synerrstr_58, synerrstr_59 
 };
 #endif
 /* END: GENERATED WITH generr.st */
diff --git a/moo/lib/exec.c b/moo/lib/exec.c
index 6ad36e6..6d61c36 100644
--- a/moo/lib/exec.c
+++ b/moo/lib/exec.c
@@ -3795,6 +3795,35 @@ int moo_execute (moo_t* moo)
 				break;
 			/* -------------------------------------------------------- */
 
+			case BCODE_MAKE_ARRAY:
+			{
+				moo_oop_t t;
+
+				FETCH_PARAM_CODE_TO (moo, b1);
+				LOG_INST_1 (moo, "make_array %zu", b1);
+
+				/* create an empty array */
+				t = moo_instantiate (moo, moo->_array, MOO_NULL, b1);
+				if (!t) goto oops;
+
+				MOO_STACK_PUSH (moo, t); /* push the array created */
+				break;
+			}
+
+			case BCODE_POP_INTO_ARRAY:
+			{
+				moo_oop_t t1, t2;
+
+				FETCH_PARAM_CODE_TO (moo, b1);
+				LOG_INST_1 (moo, "pop_into_array %zu", b1);
+
+				t1 = MOO_STACK_GETTOP(moo);
+				MOO_STACK_POP (moo);
+				t2 = MOO_STACK_GETTOP(moo);
+				((moo_oop_oop_t)t2)->slot[b1] = t1;
+				break;
+			}
+
 			case BCODE_DUP_STACKTOP:
 			{
 				moo_oop_t t;
@@ -3951,7 +3980,7 @@ int moo_execute (moo_t* moo)
 
 						MOO_LOG0 (moo, MOO_LOG_IC | MOO_LOG_ERROR, "Error - cannot return from dead context\n");
 						moo->errnum = MOO_EINTERN; /* TODO: can i make this error catchable at the moo level? */
-						return -1;
+						goto oops;
 
 					non_local_return_ok:
 /*MOO_DEBUG2 (moo, "NON_LOCAL RETURN OK TO... %p %p\n", moo->active_context->origin, moo->active_context->origin->sender);*/
@@ -3988,7 +4017,7 @@ int moo_execute (moo_t* moo)
 						MOO_STACK_PUSH (moo, (moo_oop_t)unwind_stop);
 						MOO_STACK_PUSH (moo, (moo_oop_t)return_value);
 
-						if (send_private_message (moo, fbm, 16, 0, 2) <= -1) return -1;
+						if (send_private_message (moo, fbm, 16, 0, 2) <= -1) goto oops;
 					}
 					else
 					{
@@ -4081,7 +4110,7 @@ int moo_execute (moo_t* moo)
 				 * this base block context is created with no stack for 
 				 * this reason */
 				blkctx = (moo_oop_context_t)moo_instantiate (moo, moo->_block_context, MOO_NULL, 0); 
-				if (!blkctx) return -1;
+				if (!blkctx) goto oops;
 
 				/* the long forward jump instruction has the format of 
 				 *   11000100 KKKKKKKK or 11000100 KKKKKKKK KKKKKKKK 
@@ -4138,7 +4167,7 @@ int moo_execute (moo_t* moo)
 				 * this base block context is created with no 
 				 * stack for this reason. */
 				blkctx = (moo_oop_context_t)moo_instantiate (moo, moo->_block_context, MOO_NULL, 0); 
-				if (!blkctx) return -1;
+				if (!blkctx) goto oops;
 
 				/* get the receiver to the block copy message after block context instantiation
 				 * not to get affected by potential GC */
diff --git a/moo/lib/main.c b/moo/lib/main.c
index 873a8f3..400a72d 100644
--- a/moo/lib/main.c
+++ b/moo/lib/main.c
@@ -159,7 +159,6 @@ static MOO_INLINE moo_ooi_t open_input (moo_t* moo, moo_ioarg_t* arg)
 	xtn_t* xtn = moo_getxtn(moo);
 	bb_t* bb = MOO_NULL;
 
-
 /* TOOD: support predefined include directory as well */
 	if (arg->includer)
 	{
diff --git a/moo/lib/moo-prv.h b/moo/lib/moo-prv.h
index 7a19cbc..e567fa9 100644
--- a/moo/lib/moo-prv.h
+++ b/moo/lib/moo-prv.h
@@ -323,8 +323,9 @@ struct moo_iotok_t
 		MOO_IOTOK_RBRACK,
 		MOO_IOTOK_LPAREN,
 		MOO_IOTOK_RPAREN,
-		MOO_IOTOK_ARPAREN, /* #( */
+		MOO_IOTOK_APAREN,  /* #( */
 		MOO_IOTOK_BAPAREN, /* #[ */
+		MOO_IOTOK_ABRACE,  /* #{ */
 		MOO_IOTOK_PERIOD,
 		MOO_IOTOK_COMMA,
 		MOO_IOTOK_SEMICOLON,
@@ -862,6 +863,8 @@ enum moo_bcode_t
 
 	/* -------------------------------------- */
 
+	BCODE_MAKE_ARRAY               = 0xF5, /* 245 */
+	BCODE_POP_INTO_ARRAY           = 0xF6, /* 246 */
 	BCODE_DUP_STACKTOP             = 0xF7,
 	BCODE_POP_STACKTOP             = 0xF8,
 	BCODE_RETURN_STACKTOP          = 0xF9, /* ^something */
diff --git a/moo/lib/moo.h b/moo/lib/moo.h
index 8eab078..021f7af 100644
--- a/moo/lib/moo.h
+++ b/moo/lib/moo.h
@@ -1139,6 +1139,7 @@ enum moo_synerrnum_t
 	MOO_SYNERR_BLKTMPRFLOOD,  /* too many block temporaries */
 	MOO_SYNERR_BLKARGFLOOD,   /* too many block arguments */
 	MOO_SYNERR_BLKFLOOD,      /* too large block */
+	MOO_SYNERR_ARREXPFLOOD,   /* too large array expression */
 	MOO_SYNERR_PFNUM,         /* wrong primitive number */
 	MOO_SYNERR_PFID,          /* wrong primitive identifier */
 	MOO_SYNERR_MODNAME,       /* wrong module name */