diff --git a/src/lib_rdi/rdi.c b/src/lib_rdi/rdi.c
index 9463e4aa..dcbb9c1d 100644
--- a/src/lib_rdi/rdi.c
+++ b/src/lib_rdi/rdi.c
@@ -203,6 +203,7 @@ case RDI_TypeKind_ComplexF128: {result = (RDI_U8*)"ComplexF128"; *size_out = siz
 case RDI_TypeKind_Decimal32: {result = (RDI_U8*)"Decimal32"; *size_out = sizeof("Decimal32")-1;}break;
 case RDI_TypeKind_Decimal64: {result = (RDI_U8*)"Decimal64"; *size_out = sizeof("Decimal64")-1;}break;
 case RDI_TypeKind_Decimal128: {result = (RDI_U8*)"Decimal128"; *size_out = sizeof("Decimal128")-1;}break;
+case RDI_TypeKind_Variadic: {result = (RDI_U8*)"Variadic"; *size_out = sizeof("Variadic")-1;}break;
 case RDI_TypeKind_Modifier: {result = (RDI_U8*)"Modifier"; *size_out = sizeof("Modifier")-1;}break;
 case RDI_TypeKind_Ptr: {result = (RDI_U8*)"Ptr"; *size_out = sizeof("Ptr")-1;}break;
 case RDI_TypeKind_LRef: {result = (RDI_U8*)"LRef"; *size_out = sizeof("LRef")-1;}break;
@@ -221,8 +222,7 @@ case RDI_TypeKind_IncompleteUnion: {result = (RDI_U8*)"IncompleteUnion"; *size_o
 case RDI_TypeKind_IncompleteClass: {result = (RDI_U8*)"IncompleteClass"; *size_out = sizeof("IncompleteClass")-1;}break;
 case RDI_TypeKind_IncompleteEnum: {result = (RDI_U8*)"IncompleteEnum"; *size_out = sizeof("IncompleteEnum")-1;}break;
 case RDI_TypeKind_Bitfield: {result = (RDI_U8*)"Bitfield"; *size_out = sizeof("Bitfield")-1;}break;
-case RDI_TypeKind_Variadic: {result = (RDI_U8*)"Variadic"; *size_out = sizeof("Variadic")-1;}break;
-case RDI_TypeKind_Count: {result = (RDI_U8*)"Count"; *size_out = sizeof("Count")-1;}break;
+case RDI_TypeKind_COUNT: {result = (RDI_U8*)"COUNT"; *size_out = sizeof("COUNT")-1;}break;
 }
 return result;
 }
diff --git a/src/lib_rdi/rdi.h b/src/lib_rdi/rdi.h
index aadf6729..150dea81 100644
--- a/src/lib_rdi/rdi.h
+++ b/src/lib_rdi/rdi.h
@@ -315,6 +315,7 @@ RDI_TypeKind_ComplexF128          = 0x0025,
 RDI_TypeKind_Decimal32            = 0x0026,
 RDI_TypeKind_Decimal64            = 0x0027,
 RDI_TypeKind_Decimal128           = 0x0028,
+RDI_TypeKind_Variadic             = 0x0029,
 RDI_TypeKind_Modifier             = 0x1000,
 RDI_TypeKind_Ptr                  = 0x1001,
 RDI_TypeKind_LRef                 = 0x1002,
@@ -333,10 +334,9 @@ RDI_TypeKind_IncompleteUnion      = 0x2006,
 RDI_TypeKind_IncompleteClass      = 0x2007,
 RDI_TypeKind_IncompleteEnum       = 0x2008,
 RDI_TypeKind_Bitfield             = 0xF000,
-RDI_TypeKind_Variadic             = 0xF001,
-RDI_TypeKind_Count                = 0xF002,
+RDI_TypeKind_COUNT                = 0xF002,
 RDI_TypeKind_FirstBuiltIn         = RDI_TypeKind_Void,
-RDI_TypeKind_LastBuiltIn          = RDI_TypeKind_Decimal128,
+RDI_TypeKind_LastBuiltIn          = RDI_TypeKind_Variadic,
 RDI_TypeKind_FirstConstructed     = RDI_TypeKind_Modifier,
 RDI_TypeKind_LastConstructed      = RDI_TypeKind_MemberPtr,
 RDI_TypeKind_FirstUserDefined     = RDI_TypeKind_Struct,
@@ -810,6 +810,7 @@ X(ComplexF128)\
 X(Decimal32)\
 X(Decimal64)\
 X(Decimal128)\
+X(Variadic)\
 X(Modifier)\
 X(Ptr)\
 X(LRef)\
@@ -828,8 +829,7 @@ X(IncompleteUnion)\
 X(IncompleteClass)\
 X(IncompleteEnum)\
 X(Bitfield)\
-X(Variadic)\
-X(Count)\
+X(COUNT)\
 
 #define RDI_TypeModifierFlags_XList \
 X(Const)\
diff --git a/src/linker/rdi/rdi_builder.h b/src/linker/rdi/rdi_builder.h
index 38379683..09532d49 100644
--- a/src/linker/rdi/rdi_builder.h
+++ b/src/linker/rdi/rdi_builder.h
@@ -325,7 +325,7 @@ typedef struct RDIB_UDT
 
 enum
 {
-  RDI_TypeKindExt_Lo = RDI_TypeKind_Count,
+  RDI_TypeKindExt_Lo = RDI_TypeKind_COUNT,
   RDI_TypeKindExt_VirtualTable,
   RDI_TypeKindExt_StaticMethod,
   RDI_TypeKindExt_Members,
diff --git a/src/mule/mule_main.cpp b/src/mule/mule_main.cpp
index 8c7d6b33..23948081 100644
--- a/src/mule/mule_main.cpp
+++ b/src/mule/mule_main.cpp
@@ -415,6 +415,12 @@ few_params1(Pair *pairs, int count, Function_No_Params_Type *no_params_type){
 typedef char MyByte;
 raddbg_type_view(MyByte *, no_string($));
 
+static void
+variadic_params(char *fmt, ...)
+{
+  int x = 0;
+}
+
 static void
 type_coverage_eval_tests(void)
 {
@@ -709,6 +715,8 @@ type_coverage_eval_tests(void)
   
   SizedKind sized_kind = SizedKind_C;
   
+  variadic_params("foo", 123, 456);
+  
   int x = (int)(Anonymous_D);
 }
 
diff --git a/src/rdi/rdi.mdesk b/src/rdi/rdi.mdesk
index 6b16333b..88dbdfb8 100644
--- a/src/rdi/rdi.mdesk
+++ b/src/rdi/rdi.mdesk
@@ -759,7 +759,8 @@ RDI_TypeKindTable:
   {ComplexF128          0x0025     32                                            }
   {Decimal32            0x0026     4                                             }
   {Decimal64            0x0027     8                                             }
-  {Decimal128           0x0028    16               LastBuiltIn                   }
+  {Decimal128           0x0028    16                                             }
+  {Variadic             0x0029     0               LastBuiltIn                   }
   //-
   {Modifier             0x1000     0               FirstConstructed              }
   {Ptr                  0x1001     0                                             }
@@ -781,8 +782,7 @@ RDI_TypeKindTable:
   {IncompleteEnum       0x2008     0               LastIncomplete LastUserDefined}
   //-
   {Bitfield             0xF000     0                                             }
-  {Variadic             0xF001     0                                             }
-  {Count                0xF002     0                                             }
+  {COUNT                0xF002     0                                             }
 }
 
 @table(name value)
diff --git a/src/rdi_from_dwarf/rdi_from_dwarf.c b/src/rdi_from_dwarf/rdi_from_dwarf.c
index 3592a309..875f6a9c 100644
--- a/src/rdi_from_dwarf/rdi_from_dwarf.c
+++ b/src/rdi_from_dwarf/rdi_from_dwarf.c
@@ -3004,7 +3004,7 @@ d2r_convert(Arena *arena, D2R_ConvertParams *params)
     
     //////////////////////////////// 
     
-    RDIM_Type *builtin_types[RDI_TypeKind_Count] = {0};
+    RDIM_Type *builtin_types[RDI_TypeKind_COUNT] = {0};
     for (RDI_TypeKind type_kind = RDI_TypeKind_FirstBuiltIn; type_kind <= RDI_TypeKind_LastBuiltIn; type_kind += 1) {
       RDIM_Type *type = rdim_type_chunk_list_push(arena, &g_d2r_shared.types, D2R_TYPE_CHUNK_CAP);
       type->kind      = type_kind;
diff --git a/src/rdi_from_dwarf/rdi_from_dwarf_2.c b/src/rdi_from_dwarf/rdi_from_dwarf_2.c
index d7b27092..f1b9176f 100644
--- a/src/rdi_from_dwarf/rdi_from_dwarf_2.c
+++ b/src/rdi_from_dwarf/rdi_from_dwarf_2.c
@@ -489,7 +489,7 @@ d2r2_convert(Arena *arena, D2R2_ConvertParams *params)
       unit_line_tables[unit_idx] = dst_line_table;
       
       //- rjf: set up per-unit file sequence map
-      unit_file_seq_maps[unit_idx].slots_count = line_table_header->files.count;
+      unit_file_seq_maps[unit_idx].slots_count = line_table_header->files.count + 1;
       unit_file_seq_maps[unit_idx].slots = push_array(scratch.arena, FileSeqNode *, unit_file_seq_maps[unit_idx].slots_count);
       
       //- rjf: set up vm registers
@@ -705,7 +705,7 @@ d2r2_convert(Arena *arena, D2R2_ConvertParams *params)
         }
         
         //- rjf: sequence ended explicitly, or file change, or end of stream? -> push to line table
-        if(vm_regs.end_sequence || (src_file != line_seq_src_file && first_line_seq_chunk != 0) || off >= unit_line_table_data.size)
+        if(line_seq_src_file != 0 && (vm_regs.end_sequence || (src_file != line_seq_src_file && first_line_seq_chunk != 0) || off >= unit_line_table_data.size))
         {
           // rjf: combine voffs/lines/cols
           U64 seq_line_count = total_line_seq_count;
@@ -839,6 +839,30 @@ d2r2_convert(Arena *arena, D2R2_ConvertParams *params)
   }
   lane_sync_u64(&all_line_tables, 0);
   
+  ////////////////////////////
+  //- rjf: build built-in types
+  //
+  RDIM_TypeChunkList *builtin_types = 0;
+  RDIM_Type **builtin_type_from_kind_map = 0; // [RDI_TypeKind_LastBuiltIn - RDI_TypeKind_FirstBuiltIn + 1]
+  U64 builtin_type_count = RDI_TypeKind_LastBuiltIn - RDI_TypeKind_FirstBuiltIn + 1;
+  ProfScope("build built-in types") if(lane_idx() == 0)
+  {
+    builtin_types = push_array(scratch.arena, RDIM_TypeChunkList, 1);
+    builtin_type_from_kind_map = push_array(scratch.arena, RDIM_Type *, builtin_type_count);
+    for(RDI_TypeKind k = RDI_TypeKind_FirstBuiltIn; k <= RDI_TypeKind_LastBuiltIn; k += 1)
+    {
+      RDIM_Type *type = rdim_type_chunk_list_push(arena, builtin_types, builtin_type_count);
+      type->kind = k;
+      type->name.str = rdi_string_from_type_kind(k, &type->name.size);
+      type->byte_size = rdi_size_from_basic_type_kind(k);
+      if(type->byte_size == max_U32) { type->byte_size = byte_size_from_arch(arch); }
+      builtin_type_from_kind_map[k - RDI_TypeKind_FirstBuiltIn] = type;
+    }
+  }
+  lane_sync_u64(&builtin_types, 0);
+  lane_sync_u64(&builtin_type_from_kind_map, 0);
+#define d2r2_type_from_builtin_kind(k) ((RDI_TypeKind_FirstBuiltIn <= (k) && (k) <= RDI_TypeKind_LastBuiltIn) ? builtin_types[k - RDI_TypeKind_FirstBuiltIn] : 0)
+  
   ////////////////////////////
   //- rjf: fill result
   //
@@ -847,6 +871,7 @@ d2r2_convert(Arena *arena, D2R2_ConvertParams *params)
     // TODO(rjf)
   }
   
+#undef d2r2_type_from_builtin_kind
   scratch_end(scratch);
   return result;
 }