diff --git a/filter/dump.m4 b/filter/dump.m4
index cb8e5c5f..4ea3e3be 100644
--- a/filter/dump.m4
+++ b/filter/dump.m4
@@ -10,34 +10,42 @@ m4_divert(-1)m4_dnl
 # Common aliases
 m4_define(DNL, `m4_dnl')
 
-m4_define(INST, `m4_divert(1)break; case $1:
-m4_divert(-1)'))
-m4_define(LINE, `m4_divert(1)f_dump_line(item->lines[$2], indent + 1);
+m4_define(INST_FLUSH, `m4_ifdef([[INST_NAME]], [[
+m4_divert(1)
+case INST_NAME():
+m4_undivert(2)
+break;
+m4_divert(-1)
+]])')
+m4_define(INST, `INST_FLUSH()m4_define([[INST_NAME]], [[$1]])')
+
+m4_define(LINE, `m4_divert(2)f_dump_line(item->lines[$2], indent + 1);
 m4_divert(-1)')
 m4_define(LINEP, `LINE($@)')
-m4_define(SYMBOL, `m4_divert(1)debug("%ssymbol %s\n", INDENT, item->sym->name);
+m4_define(SYMBOL, `m4_divert(2)debug("%ssymbol %s\n", INDENT, item->sym->name);
 m4_divert(-1)')
-m4_define(VALI, `m4_divert(1)debug("%svalue %s\n", INDENT, val_dump(&item->val));
+m4_define(VALI, `m4_divert(2)debug("%svalue %s\n", INDENT, val_dump(&item->val));
 m4_divert(-1)')
-m4_define(VAR, `m4_divert(1)debug("%svar %s: value %s\n", INDENT, item->sym->name, val_dump(item->vp));
+m4_define(VAR, `m4_divert(2)debug("%svar %s: value %s\n", INDENT, item->sym->name, val_dump(item->vp));
 m4_divert(-1)')
-m4_define(FRET, `m4_divert(1)debug("%sfilter return value %d\n", INDENT, item->fret);
+m4_define(FRET, `m4_divert(2)debug("%sfilter return value %d\n", INDENT, item->fret);
 m4_divert(-1)')
-m4_define(ECS, `m4_divert(1)debug("%sec subtype %d\n", INDENT, item->ecs);
+m4_define(ECS, `m4_divert(2)debug("%sec subtype %d\n", INDENT, item->ecs);
 m4_divert(-1)')
-m4_define(RTC, `m4_divert(1)debug("%sroute table %s\n", INDENT, item->rtc->name);
+m4_define(RTC, `m4_divert(2)debug("%sroute table %s\n", INDENT, item->rtc->name);
 m4_divert(-1)')
-m4_define(STATIC_ATTR, `m4_divert(1)debug("%sstatic attribute %u/%u/%u\n", INDENT, item->sa.f_type, item->sa.sa_code, item->sa.readonly);
+m4_define(STATIC_ATTR, `m4_divert(2)debug("%sstatic attribute %u/%u/%u\n", INDENT, item->sa.f_type, item->sa.sa_code, item->sa.readonly);
 m4_divert(-1)')
-m4_define(DYNAMIC_ATTR, `m4_divert(1)debug("%sdynamic attribute %u/%u/%u/%u\n", INDENT, item->da.type, item->da.bit, item->da.f_type, item->da.ea_code);
+m4_define(DYNAMIC_ATTR, `m4_divert(2)debug("%sdynamic attribute %u/%u/%u/%u\n", INDENT, item->da.type, item->da.bit, item->da.f_type, item->da.ea_code);
 m4_divert(-1)')
-m4_define(DUMP, `m4_divert(1)$1m4_divert(-1)')
+m4_define(DUMP, `m4_divert(2)$1m4_divert(-1)')
 
 m4_m4wrap(`
+INST_FLUSH()
 m4_divert(0)DNL
-case FI_NOP: bug("This shall not happen");
 m4_undivert(1)
-break; default: bug( "Unknown instruction %d (%c)", item->fi_code, item->fi_code & 0xff);
+
+default: bug( "Unknown instruction %d (%c)", item->fi_code, item->fi_code & 0xff);
 ')
 
 m4_changequote([[,]])
diff --git a/filter/filter.c b/filter/filter.c
index a69d1b3d..bb5e4235 100644
--- a/filter/filter.c
+++ b/filter/filter.c
@@ -626,7 +626,6 @@ inst_line_size(const struct f_inst *what_)
   return cnt;
 }
 
-#if DEBUGGING
 #define INDENT (((const char *) f_dump_line_indent_str) + sizeof(f_dump_line_indent_str) - (indent) - 1)
 static const char f_dump_line_indent_str[] = "                                ";
 
@@ -667,9 +666,6 @@ f_dump_line(const struct f_line *dest, int indent)
   debug("%sFilter line %p dump done\n", INDENT, dest);
 #undef INDENT
 }
-#else
-#define f_dump_line(...)
-#endif
 
 static uint
 postfixify(struct f_line *dest, const struct f_inst *what_, uint pos)
@@ -695,7 +691,9 @@ f_postfixify_concat(const struct f_inst * const inst[], uint count)
   for (uint i=0; i<count; i++)
     out->len = postfixify(out, inst[i], out->len);
 
+#if DEBUGGING
   f_dump_line(out, 0);
+#endif
   return out;
 }
 
diff --git a/filter/interpret.m4 b/filter/interpret.m4
index f449d580..dfd5c6a7 100644
--- a/filter/interpret.m4
+++ b/filter/interpret.m4
@@ -10,10 +10,16 @@ m4_divert(-1)m4_dnl
 # Common aliases
 m4_define(DNL, `m4_dnl')
 
-m4_define(INST, `break; case $1:
-m4_ifelse(eval($2 > 0), `if (vstk.cnt < $2) runtime("Stack underflow");', `')
-vstk.cnt -= $2;
-')
+m4_define(INST_FLUSH, `m4_ifdef([[INST_NAME]], [[
+m4_divert(1)
+case INST_NAME():
+m4_ifelse(m4_eval(INST_INVAL() > 0), 1, [[if (vstk.cnt < INST_INVAL()) runtime("Stack underflow"); vstk.cnt -= INST_INVAL(); ]])
+m4_undivert(2)
+break;
+m4_divert(-1)
+]])')
+
+m4_define(INST, `INST_FLUSH()m4_define([[INST_NAME]], [[$1]])m4_define([[INST_INVAL]], [[$2]])m4_divert(2)')
 
 m4_define(ARG, `if (v$1.type != $2) runtime("Argument $1 of instruction %s must be of type $2, got 0x%02x", f_instruction_name(what->fi_code), v$1.type)')
 
@@ -63,12 +69,11 @@ m4_define(STRUCT, `')
 m4_define(NEW, `')
 
 m4_m4wrap(`
+INST_FLUSH()
 m4_divert(0)DNL
-case FI_NOP: bug("This shall not happen");
 m4_undivert(1)
-break; default: bug( "Unknown instruction %d (%c)", what->fi_code, what->fi_code & 0xff);
+default: bug( "Unknown instruction %d (%c)", what->fi_code, what->fi_code & 0xff);
 ')
 
-m4_divert(1)
 m4_changequote([[,]])
 
diff --git a/filter/line-size.m4 b/filter/line-size.m4
index 2c6b500b..051d3b90 100644
--- a/filter/line-size.m4
+++ b/filter/line-size.m4
@@ -10,25 +10,32 @@ m4_divert(-1)m4_dnl
 # Common aliases
 m4_define(DNL, `m4_dnl')
 
-m4_define(INST, `m4_divert(1)
+m4_define(INST_FLUSH, `m4_ifdef([[INST_NAME]], [[
+m4_divert(1)
+case INST_NAME():
+cnt += 1;
+#define what ((const struct f_inst_]]INST_NAME()[[ *) &(what_->i_]]INST_NAME()[[))
+m4_undivert(2)
 #undef what
-break; case $1: cnt += 1;
-#define what ((const struct f_inst_$1 *) &(what_->i_$1))
+break;
+m4_divert(-1)
+]])')
+m4_define(INST, `INST_FLUSH()m4_define([[INST_NAME]], [[$1]])')
+
+m4_define(ARG, `m4_divert(2)cnt += inst_line_size(what->f$1);
 m4_divert(-1)')
-m4_define(ARG, `m4_divert(1)cnt += inst_line_size(what->f$1);
+m4_define(ARG_T, `m4_divert(2)cnt += inst_line_size(what->f$1);
 m4_divert(-1)')
-m4_define(ARG_T, `m4_divert(1)cnt += inst_line_size(what->f$1);
+m4_define(ARG_ANY, `m4_divert(2)cnt += inst_line_size(what->f$1);
 m4_divert(-1)')
-m4_define(ARG_ANY, `m4_divert(1)cnt += inst_line_size(what->f$1);
-m4_divert(-1)')
-m4_define(LINE_SIZE, `m4_divert(1)$1m4_divert(-1)')
+m4_define(LINE_SIZE, `m4_divert(2)$1m4_divert(-1)')
 
 m4_m4wrap(`
+INST_FLUSH()
 m4_divert(0)DNL
-case FI_NOP: bug("This shall not happen");
 m4_undivert(1)
-#undef what
-break; default: bug( "Unknown instruction %d (%c)", what_->fi_code, what_->fi_code & 0xff);
+
+default: bug( "Unknown instruction %d (%c)", what_->fi_code, what_->fi_code & 0xff);
 ')
 
 m4_changequote([[,]])
diff --git a/filter/new.m4 b/filter/new.m4
index ebb367d0..d499c94b 100644
--- a/filter/new.m4
+++ b/filter/new.m4
@@ -20,23 +20,27 @@ m4_define(FNOUT, `m4_divert(1)')
 m4_define(FNARG, `m4_divert(2)')
 m4_define(FNBODY, `m4_divert(3)')
 
-m4_define(INST,	`m4_define([[INST_NAME]], [[$1]])FNOUT()DNL
-m4_undivert(2)DNL
-m4_undivert(3)DNL
-  return what;
-}
-
-struct f_inst *f_new_inst_$1(enum f_instruction_code fi_code
-FNBODY()) {
+m4_define(INST_FLUSH,  `m4_ifdef([[INST_NAME]], [[
+FNOUT()DNL
+struct f_inst *f_new_inst_]]INST_NAME()[[(enum f_instruction_code fi_code
+m4_undivert(2)
+) {
   struct f_inst *what = cfg_allocz(sizeof(struct f_inst));
   what->fi_code = fi_code;
   what->lineno = ifs->lino;
-FNSTOP()')
+m4_undivert(3)
+  return what;
+}
+FNSTOP()
+]]DNL
+)')
+
+m4_define(INST, `INST_FLUSH()m4_define([[INST_NAME]], [[$1]])')
 
 m4_define(WHAT, `what->i_[[]]INST_NAME()')
 
 m4_define(FNMETAARG, `FNARG(), $1 $2
-FNBODY() WHAT().$2 = $2;
+FNBODY()  WHAT().$2 = $2;
 FNSTOP()')
 m4_define(ARG, `FNMETAARG(const struct f_inst *, f$1)')
 m4_define(ARG_ANY, `FNMETAARG(const struct f_inst *, f$1)')
@@ -60,25 +64,15 @@ FNBODY()$2
 FNSTOP()')
 
 m4_m4wrap(`
-FNOUT()
-m4_undivert(2)
-m4_undivert(3)
-
+INST_FLUSH()
 m4_divert(0)
 #include "nest/bird.h"
 #include "conf/conf.h"
 #include "filter/filter.h"
 #include "filter/f-inst-struct.h"
 
-struct f_inst *f_new_inst_FI_NOP(enum f_instruction_code fi_code) {
-  struct f_inst *what = cfg_allocz(sizeof(struct f_inst));
-  what->fi_code = fi_code;
-  what->lineno = ifs->lino;
-
 m4_undivert(1)
 
-  return what;
-}
 ')
 
 m4_changequote([[,]])
diff --git a/filter/postfixify.m4 b/filter/postfixify.m4
index 36cadfba..853c9a51 100644
--- a/filter/postfixify.m4
+++ b/filter/postfixify.m4
@@ -10,55 +10,59 @@ m4_divert(-1)m4_dnl
 # Common aliases
 m4_define(DNL, `m4_dnl')
 
-m4_define(POSTFIXIFY_TRAILER, `dest->items[pos].fi_code = what_->fi_code;
-dest->items[pos].lineno = what_->lineno;')
-
-m4_define(INST, `m4_divert(1)POSTFIXIFY_TRAILER
+m4_define(INST_FLUSH, `m4_ifdef([[INST_NAME]], [[
+m4_divert(1)
+case INST_NAME():
+#define what ((const struct f_inst_]]INST_NAME()[[ *) &(what_->i_]]INST_NAME()[[))
+m4_undivert(2)
 #undef what
-break; case $1: 
-#define what ((const struct f_inst_$1 *) &(what_->i_$1))
-m4_divert(-1)'))
-m4_define(ARG, `m4_divert(1)pos = postfixify(dest, what->f$1, pos);
+dest->items[pos].fi_code = what_->fi_code;
+dest->items[pos].lineno = what_->lineno;
+break;
+m4_divert(-1)
+]])')
+m4_define(INST, `INST_FLUSH()m4_define([[INST_NAME]], [[$1]])')
+
+m4_define(ARG, `m4_divert(2)pos = postfixify(dest, what->f$1, pos);
 m4_divert(-1)')
-m4_define(ARG_ANY, `m4_divert(1)pos = postfixify(dest, what->f$1, pos);
+m4_define(ARG_ANY, `m4_divert(2)pos = postfixify(dest, what->f$1, pos);
 m4_divert(-1)')
-m4_define(LINE, `m4_divert(1)dest->items[pos].lines[$2] = f_postfixify(what->f$1);
+m4_define(LINE, `m4_divert(2)dest->items[pos].lines[$2] = f_postfixify(what->f$1);
 m4_divert(-1)')
-m4_define(LINEP, `m4_divert(1)dest->items[pos].lines[$2] = what->fl$1;
+m4_define(LINEP, `m4_divert(2)dest->items[pos].lines[$2] = what->fl$1;
 m4_divert(-1)')
-m4_define(SYMBOL, `m4_divert(1)dest->items[pos].sym = what->sym;
+m4_define(SYMBOL, `m4_divert(2)dest->items[pos].sym = what->sym;
 m4_divert(-1)')
-m4_define(VALI, `m4_divert(1)dest->items[pos].val = what->vali;
+m4_define(VALI, `m4_divert(2)dest->items[pos].val = what->vali;
 m4_divert(-1)')
-m4_define(VALP, `m4_divert(1)dest->items[pos].val = *(what->valp);
+m4_define(VALP, `m4_divert(2)dest->items[pos].val = *(what->valp);
 m4_divert(-1)')
-m4_define(VAR, `m4_divert(1)dest->items[pos].vp = (dest->items[pos].sym = what->sym)->def;
+m4_define(VAR, `m4_divert(2)dest->items[pos].vp = (dest->items[pos].sym = what->sym)->def;
 m4_divert(-1)')
-m4_define(FRET, `m4_divert(1)dest->items[pos].fret = what->fret;
+m4_define(FRET, `m4_divert(2)dest->items[pos].fret = what->fret;
 m4_divert(-1)')
-m4_define(ECS, `m4_divert(1)dest->items[pos].ecs = what->ecs;
+m4_define(ECS, `m4_divert(2)dest->items[pos].ecs = what->ecs;
 m4_divert(-1)')
-m4_define(RTC, `m4_divert(1)dest->items[pos].rtc = what->rtc;
+m4_define(RTC, `m4_divert(2)dest->items[pos].rtc = what->rtc;
 m4_divert(-1)')
-m4_define(STATIC_ATTR, `m4_divert(1)dest->items[pos].sa = what->sa;
+m4_define(STATIC_ATTR, `m4_divert(2)dest->items[pos].sa = what->sa;
 m4_divert(-1)')
-m4_define(DYNAMIC_ATTR, `m4_divert(1)dest->items[pos].da = what->da;
+m4_define(DYNAMIC_ATTR, `m4_divert(2)dest->items[pos].da = what->da;
 m4_divert(-1)')
-m4_define(COUNT, `m4_divert(1)dest->items[pos].count = what->count;
+m4_define(COUNT, `m4_divert(2)dest->items[pos].count = what->count;
 m4_divert(-1)')
-m4_define(TREE, `m4_divert(1)dest->items[pos].tree = what->tree;
+m4_define(TREE, `m4_divert(2)dest->items[pos].tree = what->tree;
 m4_divert(-1)')
-m4_define(STRING, `m4_divert(1)dest->items[pos].s = what->s;
+m4_define(STRING, `m4_divert(2)dest->items[pos].s = what->s;
 m4_divert(-1)')
-m4_define(POSTFIXIFY, `m4_divert(1)$1m4_divert(-1)')
+m4_define(POSTFIXIFY, `m4_divert(2)$1m4_divert(-1)')
 
 m4_m4wrap(`
+INST_FLUSH()
 m4_divert(0)DNL
-case FI_NOP: bug("This shall not happen");
 m4_undivert(1)
-POSTFIXIFY_TRAILER
-#undef what
-break; default: bug( "Unknown instruction %d (%c)", what_->fi_code, what_->fi_code & 0xff);
+
+default: bug( "Unknown instruction %d (%c)", what_->fi_code, what_->fi_code & 0xff);
 ')
 
 m4_changequote([[,]])
diff --git a/filter/same.m4 b/filter/same.m4
index 10979449..cf739af4 100644
--- a/filter/same.m4
+++ b/filter/same.m4
@@ -10,49 +10,54 @@ m4_divert(-1)m4_dnl
 # Common aliases
 m4_define(DNL, `m4_dnl')
 
-m4_define(INST, `m4_divert(1)break; case $1:
-m4_divert(-1)')
+m4_define(INST_FLUSH, `m4_ifdef([[INST_NAME]], [[
+m4_divert(1)
+case INST_NAME():
+m4_undivert(2)
+break;
+m4_divert(-1)
+]])')
+m4_define(INST, `INST_FLUSH()m4_define([[INST_NAME]], [[$1]])')
 
 m4_define(ARG, `')
 m4_define(ARG_ANY, `')
 
-m4_define(LINE, `m4_divert(1)if (!f_same(f1->lines[$2], f2->lines[$2])) return 0;
+m4_define(LINE, `m4_divert(2)if (!f_same(f1->lines[$2], f2->lines[$2])) return 0;
 m4_divert(-1)')
 m4_define(LINEP, LINE)
 
-m4_define(SYMBOL, `m4_divert(1){
+m4_define(SYMBOL, `m4_divert(2){
   const struct symbol *s1 = f1->sym, *s2 = f2->sym;
   if (strcmp(s1->name, s2->name)) return 0;
   if (s1->class != s2->class) return 0;
 }
 m4_divert(-1)')
 
-m4_define(VALI, `m4_divert(1)if (!val_same(f1->vp, f2->vp)) return 0;
+m4_define(VALI, `m4_divert(2)if (!val_same(f1->vp, f2->vp)) return 0;
 m4_divert(-1)')
-m4_define(VALP, `m4_divert(1)if (!val_same(f1->vp, f2->vp)) return 0;
+m4_define(VALP, `m4_divert(2)if (!val_same(f1->vp, f2->vp)) return 0;
 m4_divert(-1)')
 m4_define(VAR, `SYMBOL()VALP()')
 
-m4_define(FRET, `m4_divert(1)if (f1->fret != f2->fret) return 0;
+m4_define(FRET, `m4_divert(2)if (f1->fret != f2->fret) return 0;
 m4_divert(-1)')
-m4_define(ECS, `m4_divert(1)if (f1->ecs != f2->ecs) return 0;
+m4_define(ECS, `m4_divert(2)if (f1->ecs != f2->ecs) return 0;
 m4_divert(-1)')
-m4_define(RTC, `m4_divert(1)if (strcmp(f1->rtc->name, f2->rtc->name)) return 0;
+m4_define(RTC, `m4_divert(2)if (strcmp(f1->rtc->name, f2->rtc->name)) return 0;
 m4_divert(-1)')
-m4_define(STATIC_ATTR, `m4_divert(1)if (f1->sa.sa_code != f2->sa.sa_code) return 0;
+m4_define(STATIC_ATTR, `m4_divert(2)if (f1->sa.sa_code != f2->sa.sa_code) return 0;
 m4_divert(-1)')
-m4_define(DYNAMIC_ATTR, `m4_divert(1)if (f1->da.ea_code != f2->da.ea_code) return 0;
+m4_define(DYNAMIC_ATTR, `m4_divert(2)if (f1->da.ea_code != f2->da.ea_code) return 0;
 m4_divert(-1)')
 
-m4_define(SAME, `m4_divert(1)$1m4_divert(-1)')
+m4_define(SAME, `m4_divert(2)$1m4_divert(-1)')
 
 m4_m4wrap(`
+INST_FLUSH()
 m4_divert(0)DNL
-case FI_NOP: bug("This shall not happen");
 m4_undivert(1)
-break; default: bug( "Unknown instruction %d (%c)", f1->fi_code, f1->fi_code & 0xff);
+default: bug( "Unknown instruction %d (%c)", f1->fi_code, f1->fi_code & 0xff);
 ')
 
-m4_divert(1)
 m4_changequote([[,]])
 
diff --git a/filter/struct.m4 b/filter/struct.m4
index 66205bfd..7af28cfd 100644
--- a/filter/struct.m4
+++ b/filter/struct.m4
@@ -10,56 +10,62 @@ m4_divert(-1)m4_dnl
 # Common aliases
 m4_define(DNL, `m4_dnl')
 
-m4_define(INST,	`m4_divert(2)struct f_inst_$1 i_$1;
-m4_divert(1)};
-struct f_inst_$1 {
-m4_divert(-1)'))
-m4_define(ARG, `m4_divert(1)const struct f_inst *f$1;
+m4_define(INST_FLUSH, `m4_ifdef([[INST_NAME]], [[
+m4_divert(1)
+struct f_inst_[[]]INST_NAME() {
+m4_undivert(2)
+};
+m4_divert(3)
+struct f_inst_[[]]INST_NAME() i_[[]]INST_NAME();
+m4_divert(-1)
+]])')
+m4_define(INST, `INST_FLUSH()m4_define([[INST_NAME]], [[$1]])')
+
+m4_define(ARG, `m4_divert(2)const struct f_inst *f$1;
 m4_divert(-1)')
-m4_define(ARG_ANY, `m4_divert(1)const struct f_inst *f$1;
+m4_define(ARG_ANY, `m4_divert(2)const struct f_inst *f$1;
 m4_divert(-1)')
-m4_define(LINE, `m4_divert(1)const struct f_inst *f$1;
+m4_define(LINE, `m4_divert(2)const struct f_inst *f$1;
 m4_divert(-1)')
-m4_define(LINEP, `m4_divert(1)const struct f_line *fl$1;
+m4_define(LINEP, `m4_divert(2)const struct f_line *fl$1;
 m4_divert(-1)')
-m4_define(SYMBOL, `m4_divert(1)const struct symbol *sym;
+m4_define(SYMBOL, `m4_divert(2)const struct symbol *sym;
 m4_divert(-1)')
-m4_define(VALI, `m4_divert(1)struct f_val vali;
+m4_define(VALI, `m4_divert(2)struct f_val vali;
 m4_divert(-1)')
-m4_define(VALP, `m4_divert(1)const struct f_val *valp;
+m4_define(VALP, `m4_divert(2)const struct f_val *valp;
 m4_divert(-1)')
 m4_define(VAR, `VALP()SYMBOL()')
-m4_define(FRET, `m4_divert(1)enum filter_return fret;
+m4_define(FRET, `m4_divert(2)enum filter_return fret;
 m4_divert(-1)')
-m4_define(ECS, `m4_divert(1)enum ec_subtype ecs;
+m4_define(ECS, `m4_divert(2)enum ec_subtype ecs;
 m4_divert(-1)')
-m4_define(RTC, `m4_divert(1)const struct rtable_config *rtc;
+m4_define(RTC, `m4_divert(2)const struct rtable_config *rtc;
 m4_divert(-1)')
-m4_define(STATIC_ATTR, `m4_divert(1)struct f_static_attr sa;
+m4_define(STATIC_ATTR, `m4_divert(2)struct f_static_attr sa;
 m4_divert(-1)')
-m4_define(DYNAMIC_ATTR, `m4_divert(1)struct f_dynamic_attr da;
+m4_define(DYNAMIC_ATTR, `m4_divert(2)struct f_dynamic_attr da;
 m4_divert(-1)')
-m4_define(COUNT, `m4_divert(1)uint count;
+m4_define(COUNT, `m4_divert(2)uint count;
 m4_divert(-1)')
-m4_define(TREE, `m4_divert(1)const struct f_tree *tree;
+m4_define(TREE, `m4_divert(2)const struct f_tree *tree;
 m4_divert(-1)')
-m4_define(STRING, `m4_divert(1)const char *s;
+m4_define(STRING, `m4_divert(2)const char *s;
 m4_divert(-1)')
-m4_define(STRUCT, `m4_divert(1)$1
+m4_define(STRUCT, `m4_divert(2)$1
 m4_divert(-1)')
 
 m4_m4wrap(`
+INST_FLUSH()
 m4_divert(0)DNL
-struct f_inst_FI_NOP {
 m4_undivert(1)
-};
 
 struct f_inst {
   const struct f_inst *next;		/* Next instruction */
   enum f_instruction_code fi_code;	/* Instruction code */
   int lineno;				/* Line number */
   union {
-    m4_undivert(2)
+    m4_undivert(3)
   };
 };
 ')