diff --git a/src/main/java/dk/camelot64/kickc/model/VariableBuilder.java b/src/main/java/dk/camelot64/kickc/model/VariableBuilder.java
index b74ccb733..8feb1ffd9 100644
--- a/src/main/java/dk/camelot64/kickc/model/VariableBuilder.java
+++ b/src/main/java/dk/camelot64/kickc/model/VariableBuilder.java
@@ -335,6 +335,8 @@ public class VariableBuilder {
          return false;
       else if(isTypeStruct() && config.isStructModelClassic())
          return false;
+      else if(isTypeStruct() && ((SymbolTypeStruct)type).isUnion())
+         return false;
       else {
          VariableBuilderConfig.Scope scope = VariableBuilderConfig.getScope(isScopeGlobal(), isScopeLocal(), isScopeIntermediate(), isScopeParameter(), isScopeMember());
          VariableBuilderConfig.Type type = VariableBuilderConfig.getType(isTypeInteger(), isArray(), isTypePointer(), isTypeStruct(), isTypeVar());
diff --git a/src/test/java/dk/camelot64/kickc/test/TestProgramsFast.java b/src/test/java/dk/camelot64/kickc/test/TestProgramsFast.java
index 084c16d5f..d7d0cbebc 100644
--- a/src/test/java/dk/camelot64/kickc/test/TestProgramsFast.java
+++ b/src/test/java/dk/camelot64/kickc/test/TestProgramsFast.java
@@ -2238,10 +2238,10 @@ public class TestProgramsFast extends TestPrograms {
    }
 
 
-   //@Test
-   //public void testUnion7() throws IOException {
-   //   compileAndCompare("union-7.c", log().verboseStructUnwind());
-   //}
+   @Test
+   public void testUnion7() throws IOException {
+      compileAndCompare("union-7.c");
+   }
 
    @Test
    public void testUnion6() throws IOException {
diff --git a/src/test/kc/intermediates-struct.c b/src/test/kc/intermediates-struct.c
index cb821b878..2ccb4ba2d 100644
--- a/src/test/kc/intermediates-struct.c
+++ b/src/test/kc/intermediates-struct.c
@@ -18,7 +18,7 @@ void main() {
 }
 
 struct Data sum(char a,char b) {
-    __ma struct Data d = { a+b, b };
+    struct Data d = { a+b, b };
     return d;
 }
 
diff --git a/src/test/ref/intermediates-struct.asm b/src/test/ref/intermediates-struct.asm
index 785356bb3..69bed594d 100644
--- a/src/test/ref/intermediates-struct.asm
+++ b/src/test/ref/intermediates-struct.asm
@@ -53,7 +53,7 @@ sum: {
     stx.z $ff
     clc
     adc.z $ff
-    // __ma struct Data d = { a+b, b }
+    // struct Data d = { a+b, b }
     sta.z d
     stx d+OFFSET_STRUCT_DATA_D
     // return d;
diff --git a/src/test/ref/intermediates-struct.log b/src/test/ref/intermediates-struct.log
index 23ebad9a9..73724d9c7 100644
--- a/src/test/ref/intermediates-struct.log
+++ b/src/test/ref/intermediates-struct.log
@@ -513,7 +513,7 @@ sum: {
     stx.z $ff
     clc
     adc.z $ff
-    // __ma struct Data d = { a+b, b }
+    // struct Data d = { a+b, b }
     // [10] *((byte*)&sum::d) = sum::$0 -- _deref_pbuc1=vbuaa 
     sta.z d
     // [11] *((byte*)&sum::d+OFFSET_STRUCT_DATA_D) = sum::b#2 -- _deref_pbuc1=vbuxx 
diff --git a/src/test/ref/union-7.asm b/src/test/ref/union-7.asm
new file mode 100644
index 000000000..4371886be
--- /dev/null
+++ b/src/test/ref/union-7.asm
@@ -0,0 +1,60 @@
+// Minimal union with C-Standard behavior - union parameter
+  // Commodore 64 PRG executable file
+.file [name="union-7.prg", type="prg", segments="Program"]
+.segmentdef Program [segments="Basic, Code, Data"]
+.segmentdef Basic [start=$0801]
+.segmentdef Code [start=$80d]
+.segmentdef Data [startAfter="Code"]
+.segment Basic
+:BasicUpstart(main)
+  .const SIZEOF_UNION_DATA = 2
+  .label SCREEN = $400
+.segment Code
+main: {
+    // print(data1)
+    ldy #SIZEOF_UNION_DATA
+  !:
+    lda data1-1,y
+    sta print.data-1,y
+    dey
+    bne !-
+    ldx #0
+    jsr print
+    // print(data2)
+    ldy #SIZEOF_UNION_DATA
+  !:
+    lda data2-1,y
+    sta print.data-1,y
+    dey
+    bne !-
+    jsr print
+    // }
+    rts
+}
+// print(union Data zp(2) data)
+print: {
+    .label data = 2
+    // BYTE1(data.w)
+    lda.z data+1
+    // SCREEN[idx++] = BYTE1(data.w)
+    sta SCREEN,x
+    // SCREEN[idx++] = BYTE1(data.w);
+    inx
+    // SCREEN[idx++] = data.b
+    lda.z data
+    sta SCREEN,x
+    // SCREEN[idx++] = data.b;
+    inx
+    // SCREEN[idx++] = ' '
+    lda #' '
+    sta SCREEN,x
+    // SCREEN[idx++] = ' ';
+    inx
+    // }
+    rts
+}
+.segment Data
+  data1: .byte $12
+  .fill 1, 0
+  data2: .byte $34
+  .fill 1, 0
diff --git a/src/test/ref/union-7.cfg b/src/test/ref/union-7.cfg
new file mode 100644
index 000000000..74ed0097a
--- /dev/null
+++ b/src/test/ref/union-7.cfg
@@ -0,0 +1,28 @@
+
+void main()
+main: scope:[main]  from
+  [0] *(&print::data) = memcpy(*(&data1), union Data, SIZEOF_UNION_DATA)
+  [1] call print 
+  to:main::@1
+main::@1: scope:[main]  from main
+  [2] *(&print::data) = memcpy(*(&data2), union Data, SIZEOF_UNION_DATA)
+  [3] call print 
+  to:main::@return
+main::@return: scope:[main]  from main::@1
+  [4] return 
+  to:@return
+
+void print(union Data print::data)
+print: scope:[print]  from main main::@1
+  [5] idx#13 = phi( main/0, main::@1/idx#14 )
+  [6] print::$0 = byte1  *((word*)&print::data)
+  [7] SCREEN[idx#13] = print::$0
+  [8] idx#3 = ++ idx#13
+  [9] SCREEN[idx#3] = *((byte*)&print::data)
+  [10] idx#4 = ++ idx#3
+  [11] SCREEN[idx#4] = ' '
+  [12] idx#14 = ++ idx#4
+  to:print::@return
+print::@return: scope:[print]  from print
+  [13] return 
+  to:@return
diff --git a/src/test/ref/union-7.log b/src/test/ref/union-7.log
new file mode 100644
index 000000000..fbe168680
--- /dev/null
+++ b/src/test/ref/union-7.log
@@ -0,0 +1,449 @@
+Inlined call call __init 
+Removing C-classic struct-unwound assignment print::data = struct-unwound {*(&print::data)}
+Removing C-classic struct-unwound assignment print::data = struct-unwound {*(&print::data)}
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start::@1
+  idx#17 = phi( __start::@1/idx#18 )
+  *(&print::data) = memcpy(*(&data1), union Data, SIZEOF_UNION_DATA)
+  call print 
+  to:main::@1
+main::@1: scope:[main]  from main
+  idx#10 = phi( main/idx#6 )
+  idx#0 = idx#10
+  *(&print::data) = memcpy(*(&data2), union Data, SIZEOF_UNION_DATA)
+  call print 
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  idx#11 = phi( main::@1/idx#6 )
+  idx#1 = idx#11
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  idx#12 = phi( main::@2/idx#1 )
+  idx#2 = idx#12
+  return 
+  to:@return
+
+void print(union Data print::data)
+print: scope:[print]  from main main::@1
+  idx#13 = phi( main/idx#17, main::@1/idx#0 )
+  print::$0 = byte1  *((word*)&print::data+OFFSET_UNION_DATA_W)
+  SCREEN[idx#13] = print::$0
+  idx#3 = ++ idx#13
+  SCREEN[idx#3] = *((byte*)&print::data+OFFSET_UNION_DATA_B)
+  idx#4 = ++ idx#3
+  SCREEN[idx#4] = ' '
+  idx#5 = ++ idx#4
+  to:print::@return
+print::@return: scope:[print]  from print
+  idx#14 = phi( print/idx#5 )
+  idx#6 = idx#14
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  to:__start::__init1
+__start::__init1: scope:[__start]  from __start
+  idx#7 = 0
+  to:__start::@1
+__start::@1: scope:[__start]  from __start::__init1
+  idx#18 = phi( __start::__init1/idx#7 )
+  call main 
+  to:__start::@2
+__start::@2: scope:[__start]  from __start::@1
+  idx#15 = phi( __start::@1/idx#2 )
+  idx#8 = idx#15
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@2
+  idx#16 = phi( __start::@2/idx#8 )
+  idx#9 = idx#16
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+constant byte OFFSET_UNION_DATA_B = 0
+constant byte OFFSET_UNION_DATA_W = 0
+constant byte* const SCREEN = (byte*)$400
+constant byte SIZEOF_UNION_DATA = 2
+void __start()
+union Data data1 loadstore = { b: $12 }
+union Data data2 loadstore = { b: $34 }
+byte idx
+byte idx#0
+byte idx#1
+byte idx#10
+byte idx#11
+byte idx#12
+byte idx#13
+byte idx#14
+byte idx#15
+byte idx#16
+byte idx#17
+byte idx#18
+byte idx#2
+byte idx#3
+byte idx#4
+byte idx#5
+byte idx#6
+byte idx#7
+byte idx#8
+byte idx#9
+void main()
+void print(union Data print::data)
+byte~ print::$0
+union Data print::data loadstore
+
+Simplifying constant pointer cast (byte*) 1024
+Successful SSA optimization PassNCastSimplification
+Alias idx#0 = idx#10 
+Alias idx#1 = idx#11 idx#12 idx#2 
+Alias idx#14 = idx#5 idx#6 
+Alias idx#18 = idx#7 
+Alias idx#15 = idx#8 idx#16 idx#9 
+Successful SSA optimization Pass2AliasElimination
+Identical Phi Values idx#17 idx#18
+Identical Phi Values idx#0 idx#14
+Identical Phi Values idx#1 idx#14
+Identical Phi Values idx#15 idx#1
+Successful SSA optimization Pass2IdenticalPhiElimination
+Constant idx#18 = 0
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero (word*)&print::data in [9] print::$0 = byte1  *((word*)&print::data+OFFSET_UNION_DATA_W)
+Simplifying expression containing zero (byte*)&print::data in [12] SCREEN[idx#3] = *((byte*)&print::data+OFFSET_UNION_DATA_B)
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Eliminating unused constant OFFSET_UNION_DATA_W
+Eliminating unused constant OFFSET_UNION_DATA_B
+Successful SSA optimization PassNEliminateUnusedVars
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::__init1
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@2
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings idx#18
+Constant inlined idx#18 = 0
+Successful SSA optimization Pass2ConstantInlining
+Adding NOP phi() at start of main::@2
+CALL GRAPH
+Calls in [main] to print:1 print:4 
+
+Created 1 initial phi equivalence classes
+Coalesced [3] idx#19 = idx#14
+Coalesced down to 1 phi equivalence classes
+Culled Empty Block label main::@2
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] *(&print::data) = memcpy(*(&data1), union Data, SIZEOF_UNION_DATA)
+  [1] call print 
+  to:main::@1
+main::@1: scope:[main]  from main
+  [2] *(&print::data) = memcpy(*(&data2), union Data, SIZEOF_UNION_DATA)
+  [3] call print 
+  to:main::@return
+main::@return: scope:[main]  from main::@1
+  [4] return 
+  to:@return
+
+void print(union Data print::data)
+print: scope:[print]  from main main::@1
+  [5] idx#13 = phi( main/0, main::@1/idx#14 )
+  [6] print::$0 = byte1  *((word*)&print::data)
+  [7] SCREEN[idx#13] = print::$0
+  [8] idx#3 = ++ idx#13
+  [9] SCREEN[idx#3] = *((byte*)&print::data)
+  [10] idx#4 = ++ idx#3
+  [11] SCREEN[idx#4] = ' '
+  [12] idx#14 = ++ idx#4
+  to:print::@return
+print::@return: scope:[print]  from print
+  [13] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+union Data data1 loadstore = { b: $12 }
+union Data data2 loadstore = { b: $34 }
+byte idx
+byte idx#13 8.0
+byte idx#14 3.25
+byte idx#3 16.5
+byte idx#4 16.5
+void main()
+void print(union Data print::data)
+byte~ print::$0 22.0
+union Data print::data loadstore
+
+Initial phi equivalence classes
+[ idx#13 idx#14 ]
+Added variable print::$0 to live range equivalence class [ print::$0 ]
+Added variable idx#3 to live range equivalence class [ idx#3 ]
+Added variable idx#4 to live range equivalence class [ idx#4 ]
+Added variable data1 to live range equivalence class [ data1 ]
+Added variable data2 to live range equivalence class [ data2 ]
+Added variable print::data to live range equivalence class [ print::data ]
+Complete equivalence classes
+[ idx#13 idx#14 ]
+[ print::$0 ]
+[ idx#3 ]
+[ idx#4 ]
+[ data1 ]
+[ data2 ]
+[ print::data ]
+Allocated zp[1]:2 [ idx#13 idx#14 ]
+Allocated zp[1]:3 [ print::$0 ]
+Allocated zp[1]:4 [ idx#3 ]
+Allocated zp[1]:5 [ idx#4 ]
+Allocated mem[2] [ data1 ]
+Allocated mem[2] [ data2 ]
+Allocated zp[2]:6 [ print::data ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [0] *(&print::data) = memcpy(*(&data1), union Data, SIZEOF_UNION_DATA) [ print::data data2 ] (  [ print::data data2 ] { }  ) always clobbers reg byte a reg byte y 
+Statement [2] *(&print::data) = memcpy(*(&data2), union Data, SIZEOF_UNION_DATA) [ print::data idx#14 ] (  [ print::data idx#14 ] { { idx#13 = idx#14 } }  ) always clobbers reg byte a reg byte y 
+Removing always clobbered register reg byte a as potential for zp[1]:2 [ idx#13 idx#14 ]
+Removing always clobbered register reg byte y as potential for zp[1]:2 [ idx#13 idx#14 ]
+Statement [9] SCREEN[idx#3] = *((byte*)&print::data) [ print::data idx#3 ] ( print:1 [ data2 print::data idx#3 ] { }  print:3 [ print::data idx#3 ] { { idx#13 = idx#14 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:4 [ idx#3 ]
+Statement [11] SCREEN[idx#4] = ' ' [ print::data idx#4 ] ( print:1 [ data2 print::data idx#4 ] { }  print:3 [ print::data idx#4 ] { { idx#13 = idx#14 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:5 [ idx#4 ]
+Statement [0] *(&print::data) = memcpy(*(&data1), union Data, SIZEOF_UNION_DATA) [ print::data data2 ] (  [ print::data data2 ] { }  ) always clobbers reg byte a reg byte y 
+Statement [2] *(&print::data) = memcpy(*(&data2), union Data, SIZEOF_UNION_DATA) [ print::data idx#14 ] (  [ print::data idx#14 ] { { idx#13 = idx#14 } }  ) always clobbers reg byte a reg byte y 
+Statement [9] SCREEN[idx#3] = *((byte*)&print::data) [ print::data idx#3 ] ( print:1 [ data2 print::data idx#3 ] { }  print:3 [ print::data idx#3 ] { { idx#13 = idx#14 } }  ) always clobbers reg byte a 
+Statement [11] SCREEN[idx#4] = ' ' [ print::data idx#4 ] ( print:1 [ data2 print::data idx#4 ] { }  print:3 [ print::data idx#4 ] { { idx#13 = idx#14 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:2 [ idx#13 idx#14 ] : zp[1]:2 , reg byte x , 
+Potential registers zp[1]:3 [ print::$0 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ idx#3 ] : zp[1]:4 , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ idx#4 ] : zp[1]:5 , reg byte x , reg byte y , 
+Potential registers mem[2] [ data1 ] : mem[2] , 
+Potential registers mem[2] [ data2 ] : mem[2] , 
+Potential registers zp[2]:6 [ print::data ] : zp[2]:6 , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [] 16.5: zp[1]:4 [ idx#3 ] 16.5: zp[1]:5 [ idx#4 ] 11.25: zp[1]:2 [ idx#13 idx#14 ] 0: mem[2] [ data1 ] 0: mem[2] [ data2 ] 
+Uplift Scope [print] 22: zp[1]:3 [ print::$0 ] 0: zp[2]:6 [ print::data ] 
+Uplift Scope [Data] 
+Uplift Scope [main] 
+
+Uplifting [] best 102 combination reg byte x [ idx#3 ] reg byte x [ idx#4 ] reg byte x [ idx#13 idx#14 ] mem[2] [ data1 ] mem[2] [ data2 ] 
+Uplifting [print] best 96 combination reg byte a [ print::$0 ] zp[2]:6 [ print::data ] 
+Uplifting [Data] best 96 combination 
+Uplifting [main] best 96 combination 
+Allocated (was zp[2]:6) zp[2]:2 [ print::data ]
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+// Minimal union with C-Standard behavior - union parameter
+  // Upstart
+  // Commodore 64 PRG executable file
+.file [name="union-7.prg", type="prg", segments="Program"]
+.segmentdef Program [segments="Basic, Code, Data"]
+.segmentdef Basic [start=$0801]
+.segmentdef Code [start=$80d]
+.segmentdef Data [startAfter="Code"]
+.segment Basic
+:BasicUpstart(main)
+  // Global Constants & labels
+  .const SIZEOF_UNION_DATA = 2
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [0] *(&print::data) = memcpy(*(&data1), union Data, SIZEOF_UNION_DATA) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3 
+    ldy #SIZEOF_UNION_DATA
+  !:
+    lda data1-1,y
+    sta print.data-1,y
+    dey
+    bne !-
+    // [1] call print 
+    // [5] phi from main to print [phi:main->print]
+  print_from_main:
+    // [5] phi idx#13 = 0 [phi:main->print#0] -- vbuxx=vbuc1 
+    ldx #0
+    jsr print
+    jmp __b1
+    // main::@1
+  __b1:
+    // [2] *(&print::data) = memcpy(*(&data2), union Data, SIZEOF_UNION_DATA) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3 
+    ldy #SIZEOF_UNION_DATA
+  !:
+    lda data2-1,y
+    sta print.data-1,y
+    dey
+    bne !-
+    // [3] call print 
+    // [5] phi from main::@1 to print [phi:main::@1->print]
+  print_from___b1:
+    // [5] phi idx#13 = idx#14 [phi:main::@1->print#0] -- register_copy 
+    jsr print
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [4] return 
+    rts
+}
+  // print
+// print(union Data zp(2) data)
+print: {
+    .label data = 2
+    // [6] print::$0 = byte1  *((word*)&print::data) -- vbuaa=_byte1__deref_pwuc1 
+    lda.z data+1
+    // [7] SCREEN[idx#13] = print::$0 -- pbuc1_derefidx_vbuxx=vbuaa 
+    sta SCREEN,x
+    // [8] idx#3 = ++ idx#13 -- vbuxx=_inc_vbuxx 
+    inx
+    // [9] SCREEN[idx#3] = *((byte*)&print::data) -- pbuc1_derefidx_vbuxx=_deref_pbuc2 
+    lda.z data
+    sta SCREEN,x
+    // [10] idx#4 = ++ idx#3 -- vbuxx=_inc_vbuxx 
+    inx
+    // [11] SCREEN[idx#4] = ' ' -- pbuc1_derefidx_vbuxx=vbuc2 
+    lda #' '
+    sta SCREEN,x
+    // [12] idx#14 = ++ idx#4 -- vbuxx=_inc_vbuxx 
+    inx
+    jmp __breturn
+    // print::@return
+  __breturn:
+    // [13] return 
+    rts
+}
+  // File Data
+.segment Data
+  data1: .byte $12
+  .fill 1, 0
+  data2: .byte $34
+  .fill 1, 0
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction print_from_main:
+Removing instruction __b1:
+Removing instruction print_from___b1:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+constant byte* const SCREEN = (byte*) 1024
+constant byte SIZEOF_UNION_DATA = 2
+union Data data1 loadstore mem[2] = { b: $12 }
+union Data data2 loadstore mem[2] = { b: $34 }
+byte idx
+byte idx#13 reg byte x 8.0
+byte idx#14 reg byte x 3.25
+byte idx#3 reg byte x 16.5
+byte idx#4 reg byte x 16.5
+void main()
+void print(union Data print::data)
+byte~ print::$0 reg byte a 22.0
+union Data print::data loadstore zp[2]:2
+
+reg byte x [ idx#13 idx#14 ]
+reg byte a [ print::$0 ]
+reg byte x [ idx#3 ]
+reg byte x [ idx#4 ]
+mem[2] [ data1 ]
+mem[2] [ data2 ]
+zp[2]:2 [ print::data ]
+
+
+FINAL ASSEMBLER
+Score: 87
+
+  // File Comments
+// Minimal union with C-Standard behavior - union parameter
+  // Upstart
+  // Commodore 64 PRG executable file
+.file [name="union-7.prg", type="prg", segments="Program"]
+.segmentdef Program [segments="Basic, Code, Data"]
+.segmentdef Basic [start=$0801]
+.segmentdef Code [start=$80d]
+.segmentdef Data [startAfter="Code"]
+.segment Basic
+:BasicUpstart(main)
+  // Global Constants & labels
+  .const SIZEOF_UNION_DATA = 2
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // print(data1)
+    // [0] *(&print::data) = memcpy(*(&data1), union Data, SIZEOF_UNION_DATA) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3 
+    ldy #SIZEOF_UNION_DATA
+  !:
+    lda data1-1,y
+    sta print.data-1,y
+    dey
+    bne !-
+    // [1] call print 
+    // [5] phi from main to print [phi:main->print]
+    // [5] phi idx#13 = 0 [phi:main->print#0] -- vbuxx=vbuc1 
+    ldx #0
+    jsr print
+    // main::@1
+    // print(data2)
+    // [2] *(&print::data) = memcpy(*(&data2), union Data, SIZEOF_UNION_DATA) -- _deref_pssc1=_deref_pssc2_memcpy_vbuc3 
+    ldy #SIZEOF_UNION_DATA
+  !:
+    lda data2-1,y
+    sta print.data-1,y
+    dey
+    bne !-
+    // [3] call print 
+    // [5] phi from main::@1 to print [phi:main::@1->print]
+    // [5] phi idx#13 = idx#14 [phi:main::@1->print#0] -- register_copy 
+    jsr print
+    // main::@return
+    // }
+    // [4] return 
+    rts
+}
+  // print
+// print(union Data zp(2) data)
+print: {
+    .label data = 2
+    // BYTE1(data.w)
+    // [6] print::$0 = byte1  *((word*)&print::data) -- vbuaa=_byte1__deref_pwuc1 
+    lda.z data+1
+    // SCREEN[idx++] = BYTE1(data.w)
+    // [7] SCREEN[idx#13] = print::$0 -- pbuc1_derefidx_vbuxx=vbuaa 
+    sta SCREEN,x
+    // SCREEN[idx++] = BYTE1(data.w);
+    // [8] idx#3 = ++ idx#13 -- vbuxx=_inc_vbuxx 
+    inx
+    // SCREEN[idx++] = data.b
+    // [9] SCREEN[idx#3] = *((byte*)&print::data) -- pbuc1_derefidx_vbuxx=_deref_pbuc2 
+    lda.z data
+    sta SCREEN,x
+    // SCREEN[idx++] = data.b;
+    // [10] idx#4 = ++ idx#3 -- vbuxx=_inc_vbuxx 
+    inx
+    // SCREEN[idx++] = ' '
+    // [11] SCREEN[idx#4] = ' ' -- pbuc1_derefidx_vbuxx=vbuc2 
+    lda #' '
+    sta SCREEN,x
+    // SCREEN[idx++] = ' ';
+    // [12] idx#14 = ++ idx#4 -- vbuxx=_inc_vbuxx 
+    inx
+    // print::@return
+    // }
+    // [13] return 
+    rts
+}
+  // File Data
+.segment Data
+  data1: .byte $12
+  .fill 1, 0
+  data2: .byte $34
+  .fill 1, 0
+