diff --git a/basis/compiler/cfg/branch-splitting/branch-splitting-tests.factor b/basis/compiler/cfg/branch-splitting/branch-splitting-tests.factor
index f3790fd338..4785fd8129 100644
--- a/basis/compiler/cfg/branch-splitting/branch-splitting-tests.factor
+++ b/basis/compiler/cfg/branch-splitting/branch-splitting-tests.factor
@@ -1,4 +1,4 @@
-USING: accessors assocs compiler.cfg
+USING: accessors assocs compiler.cfg.utilities compiler.cfg
 compiler.cfg.branch-splitting compiler.cfg.debugger
 compiler.cfg.predecessors compiler.cfg.rpo compiler.cfg.instructions fry kernel
 tools.test namespaces sequences vectors ;
@@ -18,7 +18,7 @@ IN: compiler.cfg.branch-splitting.tests
     check-predecessors ;
 
 : test-branch-splitting ( -- )
-    cfg new 0 get >>entry check-branch-splitting ;
+    0 get block>cfg check-branch-splitting ;
 
 V{ T{ ##branch } } 0 test-bb
 
@@ -82,4 +82,4 @@ V{ T{ ##branch } } 2 test-bb
 
 1 2 edge
 
-[ ] [ test-branch-splitting ] unit-test
\ No newline at end of file
+[ ] [ test-branch-splitting ] unit-test
diff --git a/basis/compiler/cfg/copy-prop/copy-prop-tests.factor b/basis/compiler/cfg/copy-prop/copy-prop-tests.factor
index 84641183b7..5f5d05560c 100644
--- a/basis/compiler/cfg/copy-prop/copy-prop-tests.factor
+++ b/basis/compiler/cfg/copy-prop/copy-prop-tests.factor
@@ -1,11 +1,10 @@
-USING: compiler.cfg.copy-prop tools.test namespaces kernel
-compiler.cfg.debugger compiler.cfg accessors
-compiler.cfg.registers compiler.cfg.instructions
-cpu.architecture ;
+USING: accessors compiler.cfg  compiler.cfg.copy-prop compiler.cfg.debugger
+compiler.cfg.instructions compiler.cfg.registers compiler.cfg.utilities
+cpu.architecture kernel namespaces tools.test ;
 IN: compiler.cfg.copy-prop.tests
 
 : test-copy-propagation ( -- )
-    cfg new 0 get >>entry copy-propagation drop ;
+    0 get block>cfg copy-propagation drop ;
 
 ! Simple example
 V{
diff --git a/basis/compiler/cfg/dce/dce-tests.factor b/basis/compiler/cfg/dce/dce-tests.factor
index 460d1a53d1..4262bce738 100644
--- a/basis/compiler/cfg/dce/dce-tests.factor
+++ b/basis/compiler/cfg/dce/dce-tests.factor
@@ -1,14 +1,11 @@
 ! Copyright (C) 2009 Daniel Ehrenberg.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: tools.test compiler.cfg kernel accessors compiler.cfg.dce
-compiler.cfg.instructions compiler.cfg.registers cpu.architecture ;
+USING: accessors kernel compiler.cfg compiler.cfg.dce compiler.cfg.instructions
+compiler.cfg.registers compiler.cfg.utilities cpu.architecture tools.test ;
 IN: compiler.cfg.dce.tests
 
 : test-dce ( insns -- insns' )
-    <basic-block> swap >>instructions
-    cfg new swap >>entry
-    eliminate-dead-code
-    entry>> instructions>> ; 
+    insns>cfg eliminate-dead-code entry>> instructions>> ;
 
 [ V{
     T{ ##load-integer { dst 1 } { val 8 } }
diff --git a/basis/compiler/cfg/debugger/debugger.factor b/basis/compiler/cfg/debugger/debugger.factor
index 58d782aad3..540daa1c8c 100644
--- a/basis/compiler/cfg/debugger/debugger.factor
+++ b/basis/compiler/cfg/debugger/debugger.factor
@@ -100,8 +100,7 @@ M: rs-loc pprint* \ R pprint-loc ;
     ] each-phi ;
 
 : test-bb ( insns n -- )
-    [ <basic-block> swap >>number swap >>instructions dup ] keep set
-    resolve-phis ;
+    [ insns>block dup ] keep set resolve-phis ;
 
 : edge ( from to -- )
     [ get ] bi@ 1vector >>successors drop ;
diff --git a/basis/compiler/cfg/def-use/def-use-tests.factor b/basis/compiler/cfg/def-use/def-use-tests.factor
index 681e0fd74f..791f5ef755 100644
--- a/basis/compiler/cfg/def-use/def-use-tests.factor
+++ b/basis/compiler/cfg/def-use/def-use-tests.factor
@@ -1,13 +1,9 @@
 ! Copyright (C) 2009 Daniel Ehrenberg.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: kernel tools.test accessors vectors sequences namespaces
-arrays
-cpu.architecture
-compiler.cfg.def-use
-compiler.cfg
-compiler.cfg.debugger
-compiler.cfg.instructions
-compiler.cfg.registers ;
+arrays compiler.cfg.def-use compiler.cfg compiler.cfg.debugger
+compiler.cfg.instructions compiler.cfg.registers compiler.cfg.utilities
+cpu.architecture ;
 IN: compiler.cfg.def-use.tests
 
 V{
@@ -32,5 +28,5 @@ V{
 4 6 edge
 5 6 edge
 
-cfg new 1 get >>entry 0 set
+1 get block>cfg 0 set
 [ ] [ 0 get compute-defs ] unit-test
diff --git a/basis/compiler/cfg/dominance/dominance-tests.factor b/basis/compiler/cfg/dominance/dominance-tests.factor
index b24e51abfb..9e7d827172 100644
--- a/basis/compiler/cfg/dominance/dominance-tests.factor
+++ b/basis/compiler/cfg/dominance/dominance-tests.factor
@@ -1,11 +1,10 @@
 USING: tools.test sequences vectors namespaces kernel accessors assocs sets
 math.ranges arrays compiler.cfg compiler.cfg.dominance compiler.cfg.debugger
-compiler.cfg.predecessors ;
+compiler.cfg.predecessors compiler.cfg.utilities ;
 IN: compiler.cfg.dominance.tests
 
 : test-dominance ( -- )
-    cfg new 0 get >>entry
-    needs-dominance drop ;
+    0 get block>cfg needs-dominance drop ;
 
 ! Example with no back edges
 V{ } 0 test-bb
diff --git a/basis/compiler/cfg/gc-checks/gc-checks-tests.factor b/basis/compiler/cfg/gc-checks/gc-checks-tests.factor
index 43e69c8800..e9054ea746 100644
--- a/basis/compiler/cfg/gc-checks/gc-checks-tests.factor
+++ b/basis/compiler/cfg/gc-checks/gc-checks-tests.factor
@@ -4,7 +4,7 @@ compiler.cfg.registers compiler.cfg.instructions compiler.cfg
 compiler.cfg.predecessors compiler.cfg.rpo cpu.architecture
 tools.test kernel vectors namespaces accessors sequences alien
 memory classes make combinators.short-circuit byte-arrays
-compiler.cfg.comparisons ;
+compiler.cfg.comparisons compiler.cfg.utilities ;
 IN: compiler.cfg.gc-checks.tests
 
 [ { } ] [
@@ -84,7 +84,7 @@ IN: compiler.cfg.gc-checks.tests
 
 : test-gc-checks ( -- )
     H{ } clone representations set
-    cfg new 0 get >>entry cfg set ;
+    0 get block>cfg cfg set ;
 
 V{
     T{ ##inc-d f 3 }
diff --git a/basis/compiler/cfg/gc-checks/gc-checks.factor b/basis/compiler/cfg/gc-checks/gc-checks.factor
index 42b32dbb28..87506e9377 100644
--- a/basis/compiler/cfg/gc-checks/gc-checks.factor
+++ b/basis/compiler/cfg/gc-checks/gc-checks.factor
@@ -77,7 +77,7 @@ M: ##box-displaced-alien allocation-size* drop 5 cells ;
     ] each ;
 
 : make-blocks ( insns-seq -- bbs )
-    [ <basic-block> swap >>instructions ] map ;
+    [ f insns>block ] map ;
 
 : <gc-call> ( -- bb )
     <basic-block>
diff --git a/basis/compiler/cfg/linear-scan/linear-scan-tests.factor b/basis/compiler/cfg/linear-scan/linear-scan-tests.factor
index ad97fd48c2..94a43dc28a 100644
--- a/basis/compiler/cfg/linear-scan/linear-scan-tests.factor
+++ b/basis/compiler/cfg/linear-scan/linear-scan-tests.factor
@@ -19,7 +19,8 @@ compiler.cfg.linear-scan.allocation
 compiler.cfg.linear-scan.allocation.state
 compiler.cfg.linear-scan.allocation.splitting
 compiler.cfg.linear-scan.allocation.spilling
-compiler.cfg.linear-scan.debugger ;
+compiler.cfg.linear-scan.debugger
+compiler.cfg.utilities ;
 FROM: namespaces => set ;
 IN: compiler.cfg.linear-scan.tests
 
@@ -37,7 +38,7 @@ V{
 } 0 test-bb
 
 : test-live-intervals ( -- )
-    cfg new 0 get >>entry
+    0 get block>cfg
     [ cfg set ] [ number-instructions ] [ compute-live-intervals ] tri
     2drop ;
 
diff --git a/basis/compiler/cfg/linearization/linearization-tests.factor b/basis/compiler/cfg/linearization/linearization-tests.factor
index edaeb720c7..0bde122dcd 100644
--- a/basis/compiler/cfg/linearization/linearization-tests.factor
+++ b/basis/compiler/cfg/linearization/linearization-tests.factor
@@ -1,5 +1,5 @@
 USING: compiler.cfg.debugger compiler.cfg compiler.cfg.linearization
-kernel accessors sequences sets tools.test namespaces ;
+compiler.cfg.utilities kernel accessors sequences sets tools.test namespaces ;
 IN: compiler.cfg.linearization.tests
 
 V{ } 0 test-bb
@@ -11,4 +11,4 @@ V{ } 2 test-bb
 0 { 1 1 } edges
 1 2 edge
 
-[ t ] [ cfg new 0 get >>entry linearization-order [ id>> ] map all-unique? ] unit-test
+[ t ] [ 0 get block>cfg linearization-order [ id>> ] map all-unique? ] unit-test
diff --git a/basis/compiler/cfg/liveness/liveness-tests.factor b/basis/compiler/cfg/liveness/liveness-tests.factor
index ba870fbc75..5640910d45 100644
--- a/basis/compiler/cfg/liveness/liveness-tests.factor
+++ b/basis/compiler/cfg/liveness/liveness-tests.factor
@@ -1,14 +1,13 @@
 USING: compiler.cfg.liveness
-compiler.cfg.debugger compiler.cfg.instructions
-compiler.cfg.predecessors compiler.cfg.registers compiler.cfg
+compiler.cfg compiler.cfg.debugger compiler.cfg.instructions
+compiler.cfg.predecessors compiler.cfg.registers compiler.cfg.utilities
 cpu.architecture accessors namespaces sequences kernel
 tools.test vectors alien math compiler.cfg.comparisons
 cpu.x86.assembler.operands assocs ;
 IN: compiler.cfg.liveness.tests
 
 : test-liveness ( -- )
-    cfg new 1 get >>entry
-    compute-live-sets ;
+    1 get block>cfg compute-live-sets ;
 
 ! Sanity check...
 
@@ -197,7 +196,7 @@ V{
 5 6 edge
 6 7 edge
 
-[ ] [ cfg new 0 get >>entry dup cfg set compute-live-sets ] unit-test
+[ ] [ 0 get block>cfg dup cfg set compute-live-sets ] unit-test
 
 [ t ] [ 0 get live-in assoc-empty? ] unit-test
 
@@ -236,7 +235,7 @@ H{
     { 1 int-rep }
 } representations set
 
-[ ] [ cfg new 0 get >>entry dup cfg set compute-live-sets ] unit-test
+[ ] [ 0 get block>cfg dup cfg set compute-live-sets ] unit-test
 
 [ V{ { 1 0 } } ] [ 1 get instructions>> 2 swap nth gc-map>> derived-roots>> ] unit-test
 
@@ -244,4 +243,4 @@ H{
 
 [ V{ { 1 0 } } ] [ 1 get instructions>> 4 swap nth gc-map>> derived-roots>> ] unit-test
 
-[ { 0 } ] [ 1 get instructions>> 4 swap nth gc-map>> gc-roots>> ] unit-test
\ No newline at end of file
+[ { 0 } ] [ 1 get instructions>> 4 swap nth gc-map>> gc-roots>> ] unit-test
diff --git a/basis/compiler/cfg/loop-detection/loop-detection-tests.factor b/basis/compiler/cfg/loop-detection/loop-detection-tests.factor
index 80203c65e4..b6757d3612 100644
--- a/basis/compiler/cfg/loop-detection/loop-detection-tests.factor
+++ b/basis/compiler/cfg/loop-detection/loop-detection-tests.factor
@@ -1,7 +1,6 @@
-USING: compiler.cfg compiler.cfg.loop-detection
-compiler.cfg.predecessors
-compiler.cfg.debugger
-tools.test kernel namespaces accessors ;
+USING: compiler.cfg compiler.cfg.loop-detection compiler.cfg.debugger
+compiler.cfg.predecessors compiler.cfg.utilities tools.test kernel namespaces
+accessors ;
 IN: compiler.cfg.loop-detection.tests
 
 V{ } 0 test-bb
@@ -11,7 +10,8 @@ V{ } 2 test-bb
 0 { 1 2 } edges
 2 0 edge
 
-: test-loop-detection ( -- ) cfg new 0 get >>entry needs-loops drop ;
+: test-loop-detection ( -- )
+    0 get block>cfg needs-loops drop ;
 
 [ ] [ test-loop-detection ] unit-test
 
diff --git a/basis/compiler/cfg/representations/coalescing/coalescing-tests.factor b/basis/compiler/cfg/representations/coalescing/coalescing-tests.factor
index cc1bde36f1..0edbf69627 100644
--- a/basis/compiler/cfg/representations/coalescing/coalescing-tests.factor
+++ b/basis/compiler/cfg/representations/coalescing/coalescing-tests.factor
@@ -3,11 +3,12 @@ compiler.cfg.instructions
 compiler.cfg.registers
 compiler.cfg.debugger
 compiler.cfg.representations.coalescing
+compiler.cfg.utilities
 tools.test ;
 IN: compiler.cfg.representations.coalescing.tests
 
 : test-scc ( -- )
-    cfg new 0 get >>entry compute-components ;
+    0 get block>cfg compute-components ;
 
 V{
     T{ ##prologue }
diff --git a/basis/compiler/cfg/representations/representations-tests.factor b/basis/compiler/cfg/representations/representations-tests.factor
index 0e9a451c0a..91c60a24de 100644
--- a/basis/compiler/cfg/representations/representations-tests.factor
+++ b/basis/compiler/cfg/representations/representations-tests.factor
@@ -4,7 +4,7 @@ compiler.cfg.representations.preferred cpu.architecture kernel
 namespaces tools.test sequences arrays system literals layouts
 math compiler.constants compiler.cfg.representations.conversion
 compiler.cfg.representations.rewrite
-compiler.cfg.comparisons
+compiler.cfg.comparisons compiler.cfg.utilities
 make ;
 FROM: alien.c-types => char ;
 IN: compiler.cfg.representations
@@ -52,7 +52,7 @@ H{ } clone representations set
 ] unit-test
 
 : test-representations ( -- )
-    cfg new 0 get >>entry dup cfg set select-representations drop ;
+    0 get block>cfg dup cfg set select-representations drop ;
 
 ! Make sure cost calculation isn't completely wrong
 V{
diff --git a/basis/compiler/cfg/ssa/construction/construction-tests.factor b/basis/compiler/cfg/ssa/construction/construction-tests.factor
index a011bf7bec..5d7cf163a7 100644
--- a/basis/compiler/cfg/ssa/construction/construction-tests.factor
+++ b/basis/compiler/cfg/ssa/construction/construction-tests.factor
@@ -1,7 +1,8 @@
 USING: accessors compiler.cfg compiler.cfg.debugger
 compiler.cfg.dominance compiler.cfg.instructions
 compiler.cfg.predecessors compiler.cfg.ssa.construction assocs
-compiler.cfg.registers cpu.architecture kernel namespaces sequences
+compiler.cfg.registers compiler.cfg.utilities cpu.architecture kernel
+namespaces sequences
 tools.test vectors ;
 IN: compiler.cfg.ssa.construction.tests
 
@@ -11,7 +12,7 @@ IN: compiler.cfg.ssa.construction.tests
     0 basic-block set-global ;
 
 : test-ssa ( -- )
-    cfg new 0 get >>entry
+    0 get block>cfg
     dup cfg set
     construct-ssa
     drop ;
@@ -197,4 +198,4 @@ V{
 
 [ V{ } ] [ 5 get instructions>> [ ##phi? ] filter ] unit-test
 
-[ V{ } ] [ 7 get instructions>> [ ##phi? ] filter ] unit-test
\ No newline at end of file
+[ V{ } ] [ 7 get instructions>> [ ##phi? ] filter ] unit-test
diff --git a/basis/compiler/cfg/ssa/construction/tdmsc/tdmsc-tests.factor b/basis/compiler/cfg/ssa/construction/tdmsc/tdmsc-tests.factor
index 2b80ce9d59..1e12b84f27 100644
--- a/basis/compiler/cfg/ssa/construction/tdmsc/tdmsc-tests.factor
+++ b/basis/compiler/cfg/ssa/construction/tdmsc/tdmsc-tests.factor
@@ -1,12 +1,12 @@
 USING: accessors arrays compiler.cfg compiler.cfg.debugger
 compiler.cfg.dominance compiler.cfg.predecessors
-compiler.cfg.ssa.construction.tdmsc kernel namespaces sequences
-tools.test vectors sets ;
+compiler.cfg.ssa.construction.tdmsc compiler.cfg.utilities kernel namespaces
+sequences sets tools.test vectors ;
 FROM: namespaces => set ;
 IN: compiler.cfg.ssa.construction.tdmsc.tests
 
 : test-tdmsc ( -- )
-    cfg new 0 get >>entry dup cfg set
+    0 get block>cfg dup cfg set
     compute-merge-sets ;
 
 V{ } 0 test-bb
diff --git a/basis/compiler/cfg/ssa/interference/interference-tests.factor b/basis/compiler/cfg/ssa/interference/interference-tests.factor
index 8648c3ae50..07ab07af7a 100644
--- a/basis/compiler/cfg/ssa/interference/interference-tests.factor
+++ b/basis/compiler/cfg/ssa/interference/interference-tests.factor
@@ -5,12 +5,13 @@ compiler.cfg.registers compiler.cfg.predecessors
 compiler.cfg.comparisons compiler.cfg.ssa.interference
 compiler.cfg.ssa.interference.private
 compiler.cfg.ssa.interference.live-ranges
+compiler.cfg.utilities
 cpu.architecture kernel namespaces tools.test alien.c-types
 arrays sequences slots ;
 IN: compiler.cfg.ssa.interference.tests
 
 : test-interference ( -- )
-    cfg new 0 get >>entry
+    0 get block>cfg
     dup compute-live-sets
     dup compute-defs
     dup compute-insns
@@ -358,4 +359,4 @@ V{
 
 [ f ] [ 33 21 test-vregs-intersect? ] unit-test
 [ f ] [ 32 21 test-vregs-intersect? ] unit-test
-[ f ] [ 32 33 test-vregs-intersect? ] unit-test
\ No newline at end of file
+[ f ] [ 32 33 test-vregs-intersect? ] unit-test
diff --git a/basis/compiler/cfg/value-numbering/value-numbering-tests.factor b/basis/compiler/cfg/value-numbering/value-numbering-tests.factor
index 0ed93e4cb5..84f398a7b0 100644
--- a/basis/compiler/cfg/value-numbering/value-numbering-tests.factor
+++ b/basis/compiler/cfg/value-numbering/value-numbering-tests.factor
@@ -3,8 +3,8 @@ compiler.cfg.registers compiler.cfg.debugger compiler.cfg.comparisons
 cpu.architecture tools.test kernel math combinators.short-circuit
 accessors sequences compiler.cfg.predecessors locals compiler.cfg.dce
 compiler.cfg.ssa.destruction compiler.cfg.loop-detection
-compiler.cfg.representations compiler.cfg assocs vectors arrays
-layouts literals namespaces alien compiler.cfg.value-numbering.simd
+compiler.cfg.representations compiler.cfg compiler.cfg.utilities assocs vectors
+arrays layouts literals namespaces alien compiler.cfg.value-numbering.simd
 system ;
 QUALIFIED-WITH: alien.c-types c
 IN: compiler.cfg.value-numbering.tests
@@ -1245,7 +1245,7 @@ cpu x86? [
             T{ ##compare-integer-imm f 1 0 0 cc<= }
         } value-numbering-step
     ] unit-test
-    
+
     [
         {
             T{ ##peek f 0 D 0 }
@@ -2747,7 +2747,7 @@ V{
 test-diamond
 
 [ ] [
-    cfg new 0 get >>entry dup cfg set
+    0 get block>cfg dup cfg set
     value-numbering
     select-representations
     destruct-ssa drop
@@ -2787,7 +2787,7 @@ V{
 test-diamond
 
 [ ] [
-    cfg new 0 get >>entry
+    0 get block>cfg
     value-numbering
     eliminate-dead-code
     drop
@@ -2856,7 +2856,7 @@ V{
 4 5 edge
 
 [ ] [
-    cfg new 0 get >>entry
+    0 get block>cfg
     value-numbering eliminate-dead-code drop
 ] unit-test
 
diff --git a/basis/compiler/tests/low-level-ir.factor b/basis/compiler/tests/low-level-ir.factor
index 473bd4788f..683b778683 100644
--- a/basis/compiler/tests/low-level-ir.factor
+++ b/basis/compiler/tests/low-level-ir.factor
@@ -2,8 +2,8 @@ USING: accessors assocs compiler compiler.cfg
 compiler.cfg.debugger compiler.cfg.instructions
 compiler.cfg.registers compiler.cfg.linear-scan
 compiler.cfg.ssa.destruction compiler.cfg.build-stack-frame
-compiler.codegen compiler.units cpu.architecture hashtables
-kernel namespaces sequences tools.test vectors words layouts
+compiler.cfg.utilities compiler.codegen compiler.units cpu.architecture
+hashtables kernel namespaces sequences tools.test vectors words layouts
 literals math arrays alien.c-types alien.syntax math.private ;
 IN: compiler.tests.low-level-ir
 
@@ -13,7 +13,7 @@ IN: compiler.tests.low-level-ir
     [ associate >alist t t modify-code-heap ] keep ;
 
 : compile-test-cfg ( -- word )
-    cfg new 0 get >>entry
+    0 get block>cfg
     dup cfg set
     dup fake-representations
     destruct-ssa
diff --git a/extra/compiler/cfg/gvn/gvn-tests.factor b/extra/compiler/cfg/gvn/gvn-tests.factor
index f92aff0524..707b6d388b 100644
--- a/extra/compiler/cfg/gvn/gvn-tests.factor
+++ b/extra/compiler/cfg/gvn/gvn-tests.factor
@@ -2,11 +2,10 @@ USING: compiler.cfg.gvn compiler.cfg.instructions
 compiler.cfg.registers compiler.cfg.debugger
 compiler.cfg.comparisons cpu.architecture tools.test kernel
 math combinators.short-circuit accessors sequences
-compiler.cfg.predecessors locals compiler.cfg.dce
+compiler.cfg.predecessors compiler.cfg.utilities locals compiler.cfg.dce
 compiler.cfg.ssa.destruction compiler.cfg.loop-detection
 compiler.cfg.representations compiler.cfg assocs vectors arrays
-layouts literals namespaces alien compiler.cfg.gvn.simd system
-;
+layouts literals namespaces alien compiler.cfg.gvn.simd system ;
 QUALIFIED-WITH: alien.c-types c
 IN: compiler.cfg.gvn.tests
 
@@ -28,7 +27,7 @@ IN: compiler.cfg.gvn.tests
 
 : value-number-bb ( insns -- insns' )
     0 test-bb
-    cfg new 0 get >>entry
+    0 get block>cfg
     value-numbering drop
     0 get instructions>> ;
 
@@ -2616,7 +2615,7 @@ cell 8 = [
     V{ } 1 test-bb
     V{ } 2 test-bb
     0 { 1 2 } edges
-    cfg new 0 get >>entry
+    0 get block>cfg
     value-numbering drop
     0 get [ instructions>> ] [ successors>> first number>> 1 - ] bi ;
 
@@ -2800,7 +2799,7 @@ V{
 test-diamond
 
 [ ] [
-    cfg new 0 get >>entry dup cfg set
+    0 get block>cfg dup cfg set
     value-numbering
     select-representations
     destruct-ssa drop
@@ -2839,11 +2838,7 @@ V{
 
 test-diamond
 
-[ ] [
-    cfg new 0 get >>entry
-    value-numbering
-    drop
-] unit-test
+[ ] [ 0 get block>cfg value-numbering drop ] unit-test
 
 [ t ] [ 1 get successors>> first 3 get eq? ] unit-test
 
@@ -2908,7 +2903,7 @@ V{
 4 5 edge
 
 [ ] [
-    cfg new 0 get >>entry
+    0 get block>cfg
     value-numbering eliminate-dead-code drop
 ] unit-test
 
@@ -3183,10 +3178,7 @@ V{
 
 test-diamond
 
-[ ] [
-    cfg new 0 get >>entry
-    value-numbering drop
-] unit-test
+[ ] [ 0 get block>cfg value-numbering drop ] unit-test
 
 ! First ##load-integer cannot be turned into a ##copy because
 ! the canonical leader for the value 100 is unavailable, but
@@ -3246,10 +3238,7 @@ V{ T{ ##epilogue } T{ ##return } } 5 test-bb
 3 2 edge
 4 5 edge
 
-[ ] [
-    cfg new 0 get >>entry
-    value-numbering eliminate-dead-code drop
-] unit-test
+[ ] [ 0 get block>cfg value-numbering eliminate-dead-code drop ] unit-test
 
 [ 1 ] [ 1 get instructions>> [ ##load-integer? ] count ] unit-test
 [ 1 ] [ 2 get instructions>> [ ##phi? ] count ] unit-test
diff --git a/extra/compiler/cfg/gvn/testing/testing.factor b/extra/compiler/cfg/gvn/testing/testing.factor
index 59fb78accb..721321a386 100644
--- a/extra/compiler/cfg/gvn/testing/testing.factor
+++ b/extra/compiler/cfg/gvn/testing/testing.factor
@@ -3,7 +3,7 @@
 USING: accessors assocs compiler.cfg compiler.cfg.debugger
 compiler.cfg.graphviz compiler.cfg.gvn
 compiler.cfg.gvn.expressions compiler.cfg.gvn.graph
-compiler.cfg.optimizer continuations formatting graphviz
+compiler.cfg.optimizer compiler.cfg.utilities continuations formatting graphviz
 graphviz.notation graphviz.render io.directories kernel
 math.parser namespaces prettyprint sequences sorting splitting
 tools.annotations ;
@@ -104,4 +104,4 @@ SYMBOL: iteration
     ] [ reset-gvn ] [ ] cleanup ;
 
 : watch-gvn-bb ( path insns -- )
-    0 test-bb cfg new 0 get >>entry watch-gvn-cfg ;
+    0 test-bb 0 get block>cfg watch-gvn-cfg ;