@@ -322,7 +322,6 @@ uxn_eval(Uxn *u, Uint16 vec)

 	if(u->dev[0].dat[0xf]) 

 		return 0;

 	u->ram.ptr = vec;

-	if(u->wst.ptr > 0xf8) u->wst.ptr = 0xf8;

 	while(u->ram.ptr) {

 		instr = u->ram.dat[u->ram.ptr++];

 		switch(instr) {

@@ -231,7 +231,6 @@ uxn_eval(Uxn *u, Uint16 vec)

 	if(u->dev[0].dat[0xf]) 

 		return 0;

 	u->ram.ptr = vec;

-	if(u->wst.ptr > 0xf8) u->wst.ptr = 0xf8;

 	while(u->ram.ptr) {

 		instr = u->ram.dat[u->ram.ptr++];

 		switch(instr) {

@@ -45,7 +45,6 @@ uxn_eval(Uxn *u, Uint16 vec)

 	if(u->dev[0].dat[0xf]) 

 		return 0;

 	u->ram.ptr = vec;

-	if(u->wst.ptr > 0xf8) u->wst.ptr = 0xf8;

 	while(u->ram.ptr) {

 		instr = u->ram.dat[u->ram.ptr++];

 		switch(instr) {

@@ -12,95 +12,98 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 WITH REGARD TO THIS SOFTWARE.

 */

+#define MODE_RETURN 0x40

+#define MODE_KEEP 0x80

+

 #pragma mark - Operations

 /* clang-format off */

-void   push8(Stack *s, Uint8 a) { if(s->ptr == 0xff) { s->error = 2; return; } s->dat[s->ptr++] = a; }

-Uint8  pop8_keep(Stack *s) { if(s->kptr == 0) { s->error = 1; return 0; } return s->dat[--s->kptr]; }

-Uint8  pop8_nokeep(Stack *s) { if(s->ptr == 0) { s->error = 1; return 0; } return s->dat[--s->ptr]; }

+static void   push8(Stack *s, Uint8 a) { if(s->ptr == 0xff) { s->error = 2; return; } s->dat[s->ptr++] = a; }

+static Uint8  pop8_keep(Stack *s) { if(s->kptr == 0) { s->error = 1; return 0; } return s->dat[--s->kptr]; }

+static Uint8  pop8_nokeep(Stack *s) { if(s->ptr == 0) { s->error = 1; return 0; } return s->dat[--s->ptr]; }

 static Uint8 (*pop8)(Stack *s);

-void   mempoke8(Uint8 *m, Uint16 a, Uint8 b) { m[a] = b; }

-Uint8  mempeek8(Uint8 *m, Uint16 a) { return m[a]; }

-void   devpoke8(Device *d, Uint8 a, Uint8 b) { d->dat[a & 0xf] = b; d->talk(d, a & 0x0f, 1); }

-Uint8  devpeek8(Device *d, Uint8 a) { d->talk(d, a & 0x0f, 0); return d->dat[a & 0xf];  }

-void   push16(Stack *s, Uint16 a) { push8(s, a >> 8); push8(s, a); }

-Uint16 pop16(Stack *s) { Uint8 a = pop8(s), b = pop8(s); return a + (b << 8); }

+static void   mempoke8(Uint8 *m, Uint16 a, Uint8 b) { m[a] = b; }

+static Uint8  mempeek8(Uint8 *m, Uint16 a) { return m[a]; }

+static void   devpoke8(Device *d, Uint8 a, Uint8 b) { d->dat[a & 0xf] = b; d->talk(d, a & 0x0f, 1); }

+static Uint8  devpeek8(Device *d, Uint8 a) { d->talk(d, a & 0x0f, 0); return d->dat[a & 0xf];  }

+static void   push16(Stack *s, Uint16 a) { push8(s, a >> 8); push8(s, a); }

+static Uint16 pop16(Stack *s) { Uint8 a = pop8(s), b = pop8(s); return a + (b << 8); }

 void   mempoke16(Uint8 *m, Uint16 a, Uint16 b) { mempoke8(m, a, b >> 8); mempoke8(m, a + 1, b); }

 Uint16 mempeek16(Uint8 *m, Uint16 a) { return (mempeek8(m, a) << 8) + mempeek8(m, a + 1); }

-void   devpoke16(Device *d, Uint8 a, Uint16 b) { devpoke8(d, a, b >> 8); devpoke8(d, a + 1, b); }

-Uint16 devpeek16(Device *d, Uint16 a) { return (devpeek8(d, a) << 8) + devpeek8(d, a + 1); }

+static void   devpoke16(Device *d, Uint8 a, Uint16 b) { devpoke8(d, a, b >> 8); devpoke8(d, a + 1, b); }

+static Uint16 devpeek16(Device *d, Uint16 a) { return (devpeek8(d, a) << 8) + devpeek8(d, a + 1); }

 /* Stack */

-void op_brk(Uxn *u) { u->ram.ptr = 0; }

-void op_nop(Uxn *u) { (void)u; }

-void op_lit(Uxn *u) { push8(u->src, mempeek8(u->ram.dat, u->ram.ptr++)); }

-void op_pop(Uxn *u) { pop8(u->src); }

-void op_dup(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, a); push8(u->src, a); }

-void op_swp(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, a); push8(u->src, b); }

-void op_ovr(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b); push8(u->src, a); push8(u->src, b); }

-void op_rot(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src), c = pop8(u->src); push8(u->src, b); push8(u->src, a); push8(u->src, c); }

+static void op_brk(Uxn *u) { u->ram.ptr = 0; }

+static void op_nop(Uxn *u) { (void)u; }

+static void op_lit(Uxn *u) { push8(u->src, mempeek8(u->ram.dat, u->ram.ptr++)); }

+static void op_pop(Uxn *u) { pop8(u->src); }

+static void op_dup(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, a); push8(u->src, a); }

+static void op_swp(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, a); push8(u->src, b); }

+static void op_ovr(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b); push8(u->src, a); push8(u->src, b); }

+static void op_rot(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src), c = pop8(u->src); push8(u->src, b); push8(u->src, a); push8(u->src, c); }

 /* Logic */

-void op_equ(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b == a); }

-void op_neq(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b != a); }

-void op_gth(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b > a); }

-void op_lth(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b < a); }

-void op_jmp(Uxn *u) { Uint8 a = pop8(u->src); u->ram.ptr += (Sint8)a; }

-void op_jnz(Uxn *u) { Uint8 a = pop8(u->src); if(pop8(u->src)) u->ram.ptr += (Sint8)a; }

-void op_jsr(Uxn *u) { Uint8 a = pop8(u->src); push16(u->dst, u->ram.ptr); u->ram.ptr += (Sint8)a; }

-void op_sth(Uxn *u) { Uint8 a = pop8(u->src); push8(u->dst, a); }

+static void op_equ(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b == a); }

+static void op_neq(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b != a); }

+static void op_gth(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b > a); }

+static void op_lth(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b < a); }

+static void op_jmp(Uxn *u) { Uint8 a = pop8(u->src); u->ram.ptr += (Sint8)a; }

+static void op_jnz(Uxn *u) { Uint8 a = pop8(u->src); if(pop8(u->src)) u->ram.ptr += (Sint8)a; }

+static void op_jsr(Uxn *u) { Uint8 a = pop8(u->src); push16(u->dst, u->ram.ptr); u->ram.ptr += (Sint8)a; }

+static void op_sth(Uxn *u) { Uint8 a = pop8(u->src); push8(u->dst, a); }

 /* Memory */

-void op_pek(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, mempeek8(u->ram.dat, a)); }

-void op_pok(Uxn *u) { Uint8 a = pop8(u->src); Uint8 b = pop8(u->src); mempoke8(u->ram.dat, a, b); }

-void op_ldr(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, mempeek8(u->ram.dat, u->ram.ptr + (Sint8)a)); }

-void op_str(Uxn *u) { Uint8 a = pop8(u->src); Uint8 b = pop8(u->src); mempoke8(u->ram.dat, u->ram.ptr + (Sint8)a, b); }

-void op_lda(Uxn *u) { Uint16 a = pop16(u->src); push8(u->src, mempeek8(u->ram.dat, a)); }

-void op_sta(Uxn *u) { Uint16 a = pop16(u->src); Uint8 b = pop8(u->src); mempoke8(u->ram.dat, a, b); }

-void op_dei(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, devpeek8(&u->dev[a >> 4], a)); }

-void op_deo(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); devpoke8(&u->dev[a >> 4], a, b); }

+static void op_pek(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, mempeek8(u->ram.dat, a)); }

+static void op_pok(Uxn *u) { Uint8 a = pop8(u->src); Uint8 b = pop8(u->src); mempoke8(u->ram.dat, a, b); }

+static void op_ldr(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, mempeek8(u->ram.dat, u->ram.ptr + (Sint8)a)); }

+static void op_str(Uxn *u) { Uint8 a = pop8(u->src); Uint8 b = pop8(u->src); mempoke8(u->ram.dat, u->ram.ptr + (Sint8)a, b); }

+static void op_lda(Uxn *u) { Uint16 a = pop16(u->src); push8(u->src, mempeek8(u->ram.dat, a)); }

+static void op_sta(Uxn *u) { Uint16 a = pop16(u->src); Uint8 b = pop8(u->src); mempoke8(u->ram.dat, a, b); }

+static void op_dei(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, devpeek8(&u->dev[a >> 4], a)); }

+static void op_deo(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); devpoke8(&u->dev[a >> 4], a, b); }

 /* Arithmetic */

-void op_add(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b + a); }

-void op_sub(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b - a); }

-void op_mul(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b * a); }

-void op_div(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); if(a == 0) { u->src->error = 3; a = 1; } push8(u->src, b / a); }

-void op_and(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b & a); }

-void op_ora(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b | a); }

-void op_eor(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b ^ a); }

-void op_sft(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b >> (a & 0x07) << ((a & 0x70) >> 4)); }

+static void op_add(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b + a); }

+static void op_sub(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b - a); }

+static void op_mul(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b * a); }

+static void op_div(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); if(a == 0) { u->src->error = 3; a = 1; } push8(u->src, b / a); }

+static void op_and(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b & a); }

+static void op_ora(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b | a); }

+static void op_eor(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b ^ a); }

+static void op_sft(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b >> (a & 0x07) << ((a & 0x70) >> 4)); }

 /* Stack */

-void op_lit16(Uxn *u) { push16(u->src, mempeek16(u->ram.dat, u->ram.ptr++)); u->ram.ptr++; }

-void op_pop16(Uxn *u) { pop16(u->src); }

-void op_dup16(Uxn *u) { Uint16 a = pop16(u->src); push16(u->src, a); push16(u->src, a); }

-void op_swp16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, a); push16(u->src, b); }

-void op_ovr16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b); push16(u->src, a); push16(u->src, b); }

-void op_rot16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src), c = pop16(u->src); push16(u->src, b); push16(u->src, a); push16(u->src, c); }

+static void op_lit16(Uxn *u) { push16(u->src, mempeek16(u->ram.dat, u->ram.ptr++)); u->ram.ptr++; }

+static void op_pop16(Uxn *u) { pop16(u->src); }

+static void op_dup16(Uxn *u) { Uint16 a = pop16(u->src); push16(u->src, a); push16(u->src, a); }

+static void op_swp16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, a); push16(u->src, b); }

+static void op_ovr16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b); push16(u->src, a); push16(u->src, b); }

+static void op_rot16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src), c = pop16(u->src); push16(u->src, b); push16(u->src, a); push16(u->src, c); }

 /* Logic(16-bits) */

-void op_equ16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b == a); }

-void op_neq16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b != a); }

-void op_gth16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b > a); }

-void op_lth16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b < a); }

-void op_jmp16(Uxn *u) { u->ram.ptr = pop16(u->src); }

-void op_jnz16(Uxn *u) { Uint16 a = pop16(u->src); if(pop8(u->src)) u->ram.ptr = a; }

-void op_jsr16(Uxn *u) { push16(u->dst, u->ram.ptr); u->ram.ptr = pop16(u->src); }

-void op_sth16(Uxn *u) { Uint16 a = pop16(u->src); push16(u->dst, a); }

+static void op_equ16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b == a); }

+static void op_neq16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b != a); }

+static void op_gth16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b > a); }

+static void op_lth16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b < a); }

+static void op_jmp16(Uxn *u) { u->ram.ptr = pop16(u->src); }

+static void op_jnz16(Uxn *u) { Uint16 a = pop16(u->src); if(pop8(u->src)) u->ram.ptr = a; }

+static void op_jsr16(Uxn *u) { push16(u->dst, u->ram.ptr); u->ram.ptr = pop16(u->src); }

+static void op_sth16(Uxn *u) { Uint16 a = pop16(u->src); push16(u->dst, a); }

 /* Memory(16-bits) */

-void op_pek16(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, mempeek16(u->ram.dat, a)); }

-void op_pok16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); mempoke16(u->ram.dat, a, b); }

-void op_ldr16(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, mempeek16(u->ram.dat, u->ram.ptr + (Sint8)a)); }

-void op_str16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); mempoke16(u->ram.dat, u->ram.ptr + (Sint8)a, b); }

-void op_lda16(Uxn *u) { Uint16 a = pop16(u->src); push16(u->src, mempeek16(u->ram.dat, a)); }

-void op_sta16(Uxn *u) { Uint16 a = pop16(u->src); Uint16 b = pop16(u->src); mempoke16(u->ram.dat, a, b); }

-void op_dei16(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, devpeek16(&u->dev[a >> 4], a)); }

-void op_deo16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); devpoke16(&u->dev[a >> 4], a, b); }

+static void op_pek16(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, mempeek16(u->ram.dat, a)); }

+static void op_pok16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); mempoke16(u->ram.dat, a, b); }

+static void op_ldr16(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, mempeek16(u->ram.dat, u->ram.ptr + (Sint8)a)); }

+static void op_str16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); mempoke16(u->ram.dat, u->ram.ptr + (Sint8)a, b); }

+static void op_lda16(Uxn *u) { Uint16 a = pop16(u->src); push16(u->src, mempeek16(u->ram.dat, a)); }

+static void op_sta16(Uxn *u) { Uint16 a = pop16(u->src); Uint16 b = pop16(u->src); mempoke16(u->ram.dat, a, b); }

+static void op_dei16(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, devpeek16(&u->dev[a >> 4], a)); }

+static void op_deo16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); devpoke16(&u->dev[a >> 4], a, b); }

 /* Arithmetic(16-bits) */

-void op_add16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b + a); }

-void op_sub16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b - a); }

-void op_mul16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b * a); }

-void op_div16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); if(a == 0) { u->src->error = 3; a = 1; } push16(u->src, b / a); }

-void op_and16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b & a); }

-void op_ora16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b | a); }

-void op_eor16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b ^ a); }

-void op_sft16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); push16(u->src, b >> (a & 0x0f) << ((a & 0xf0) >> 4)); }

+static void op_add16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b + a); }

+static void op_sub16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b - a); }

+static void op_mul16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b * a); }

+static void op_div16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); if(a == 0) { u->src->error = 3; a = 1; } push16(u->src, b / a); }

+static void op_and16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b & a); }

+static void op_ora16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b | a); }

+static void op_eor16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b ^ a); }

+static void op_sft16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); push16(u->src, b >> (a & 0x0f) << ((a & 0xf0) >> 4)); }

-void (*ops[])(Uxn *u) = {

+static void (*ops[])(Uxn *u) = {

 	op_brk, op_lit, op_nop, op_pop, op_dup, op_swp, op_ovr, op_rot,

 	op_equ, op_neq, op_gth, op_lth, op_jmp, op_jnz, op_jsr, op_sth, 

 	op_pek, op_pok, op_ldr, op_str, op_lda, op_sta, op_dei, op_deo,

@@ -116,38 +119,35 @@ void (*ops[])(Uxn *u) = {

 #pragma mark - Core

-int

-uxn_step(Uxn *u, Uint8 instr)

-{

-	Uint8 op = instr & 0x3f, freturn = instr & 0x40, fkeep = instr & 0x80;

-	u->src = freturn ? &u->rst : &u->wst;

-	u->dst = freturn ? &u->wst : &u->rst;

-	if(fkeep) {

-		pop8 = pop8_keep;

-		u->src->kptr = u->src->ptr;

-	} else

-		pop8 = pop8_nokeep;

-	/* run */

-	(*ops[op])(u);

-	if(u->wst.error)

-		return uxn_halt(u, u->wst.error, "Working-stack", instr);

-	if(u->rst.error)

-		return uxn_halt(u, u->rst.error, "Return-stack", instr);

-	return 1;

-}

-

 int

 uxn_eval(Uxn *u, Uint16 vec)

 {

 	if(u->dev[0].dat[0xf])

 		return 0;

 	u->ram.ptr = vec;

-	u->wst.error = 0;

-	u->rst.error = 0;

-	if(u->wst.ptr > 0xf8) u->wst.ptr = 0xf8;

-	while(u->ram.ptr)

-		if(!uxn_step(u, u->ram.dat[u->ram.ptr++]))

-			return 0;

+	while(u->ram.ptr) {

+		Uint8 instr = u->ram.dat[u->ram.ptr++];

+		/* Return Mode */

+		if(instr & MODE_RETURN) {

+			u->src = &u->rst;

+			u->dst = &u->wst;

+		} else {

+			u->src = &u->wst;

+			u->dst = &u->rst;

+		}

+		/* Keep Mode */

+		if(instr & MODE_KEEP) {

+			pop8 = pop8_keep;

+			u->src->kptr = u->src->ptr;

+		} else {

+			pop8 = pop8_nokeep;

+		}

+		(*ops[instr & 0x3f])(u);

+		if(u->wst.error)

+			return uxn_halt(u, u->wst.error, "Working-stack", instr);

+		if(u->rst.error)

+			return uxn_halt(u, u->rst.error, "Return-stack", instr);

+	}

 	return 1;

 }