diff --git a/src/test/run-make/graphviz-flowgraph/Makefile b/src/test/run-make/graphviz-flowgraph/Makefile
index fedcc89cd42..09440949177 100644
--- a/src/test/run-make/graphviz-flowgraph/Makefile
+++ b/src/test/run-make/graphviz-flowgraph/Makefile
@@ -2,7 +2,8 @@
 
 FILES=f00.rs f01.rs f02.rs f03.rs f04.rs f05.rs f06.rs f07.rs \
       f08.rs f09.rs f10.rs f11.rs f12.rs f13.rs f14.rs f15.rs \
-      f16.rs f17.rs f18.rs f19.rs f20.rs f21.rs f22.rs
+      f16.rs f17.rs f18.rs f19.rs f20.rs f21.rs f22.rs f23.rs \
+      f24.rs f25.rs
 
 
 # all: $(patsubst %.rs,$(TMPDIR)/%.dot,$(FILES)) $(patsubst %.rs,$(TMPDIR)/%.pp,$(FILES))
diff --git a/src/test/run-make/graphviz-flowgraph/f23.dot-expected.dot b/src/test/run-make/graphviz-flowgraph/f23.dot-expected.dot
new file mode 100644
index 00000000000..876957a0689
--- /dev/null
+++ b/src/test/run-make/graphviz-flowgraph/f23.dot-expected.dot
@@ -0,0 +1,93 @@
+digraph block {
+    N0[label="entry"];
+    N1[label="exit"];
+    N2[label="expr 23"];
+    N3[label="local mut x"];
+    N4[label="expr 23"];
+    N5[label="local mut y"];
+    N6[label="expr 23"];
+    N7[label="local mut z"];
+    N8[label="(dummy_node)"];
+    N9[label="expr x"];
+    N10[label="expr 0"];
+    N11[label="expr x > 0"];
+    N12[label="expr while x > 0 {\l    x -= 1;\l    while y > 0 {\l        y -= 1;\l        while z > 0 { z -= 1; }\l        if x > 10 { return; \"unreachable\"; }\l    }\l}\l"];
+    N13[label="expr 1"];
+    N14[label="expr x"];
+    N15[label="expr x -= 1"];
+    N16[label="(dummy_node)"];
+    N17[label="expr y"];
+    N18[label="expr 0"];
+    N19[label="expr y > 0"];
+    N20[label="expr while y > 0 {\l    y -= 1;\l    while z > 0 { z -= 1; }\l    if x > 10 { return; \"unreachable\"; }\l}\l"];
+    N21[label="expr 1"];
+    N22[label="expr y"];
+    N23[label="expr y -= 1"];
+    N24[label="(dummy_node)"];
+    N25[label="expr z"];
+    N26[label="expr 0"];
+    N27[label="expr z > 0"];
+    N28[label="expr while z > 0 { z -= 1; }"];
+    N29[label="expr 1"];
+    N30[label="expr z"];
+    N31[label="expr z -= 1"];
+    N32[label="block { z -= 1; }"];
+    N33[label="expr x"];
+    N34[label="expr 10"];
+    N35[label="expr x > 10"];
+    N36[label="expr return"];
+    N37[label="(dummy_node)"];
+    N38[label="expr \"unreachable\""];
+    N39[label="block { return; \"unreachable\"; }"];
+    N40[label="expr if x > 10 { return; \"unreachable\"; }"];
+    N41[label="block { y -= 1; while z > 0 { z -= 1; } if x > 10 { return; \"unreachable\"; } }"];
+    N42[label="block {\l    x -= 1;\l    while y > 0 {\l        y -= 1;\l        while z > 0 { z -= 1; }\l        if x > 10 { return; \"unreachable\"; }\l    }\l}\l"];
+    N43[label="block {\l    let mut x = 23;\l    let mut y = 23;\l    let mut z = 23;\l    while x > 0 {\l        x -= 1;\l        while y > 0 {\l            y -= 1;\l            while z > 0 { z -= 1; }\l            if x > 10 { return; \"unreachable\"; }\l        }\l    }\l}\l"];
+    N0 -> N2;
+    N2 -> N3;
+    N3 -> N4;
+    N4 -> N5;
+    N5 -> N6;
+    N6 -> N7;
+    N7 -> N8;
+    N8 -> N9;
+    N9 -> N10;
+    N10 -> N11;
+    N11 -> N12;
+    N11 -> N13;
+    N13 -> N14;
+    N14 -> N15;
+    N15 -> N16;
+    N16 -> N17;
+    N17 -> N18;
+    N18 -> N19;
+    N19 -> N20;
+    N19 -> N21;
+    N21 -> N22;
+    N22 -> N23;
+    N23 -> N24;
+    N24 -> N25;
+    N25 -> N26;
+    N26 -> N27;
+    N27 -> N28;
+    N27 -> N29;
+    N29 -> N30;
+    N30 -> N31;
+    N31 -> N32;
+    N32 -> N24;
+    N28 -> N33;
+    N33 -> N34;
+    N34 -> N35;
+    N35 -> N36;
+    N36 -> N1[label="exiting scope_0 expr while y > 0 {\l    y -= 1;\l    while z > 0 { z -= 1; }\l    if x > 10 { return; \"unreachable\"; }\l}\l,\lexiting scope_1 expr while x > 0 {\l    x -= 1;\l    while y > 0 {\l        y -= 1;\l        while z > 0 { z -= 1; }\l        if x > 10 { return; \"unreachable\"; }\l    }\l}\l"];
+    N37 -> N38;
+    N38 -> N39;
+    N35 -> N40;
+    N39 -> N40;
+    N40 -> N41;
+    N41 -> N16;
+    N20 -> N42;
+    N42 -> N8;
+    N12 -> N43;
+    N43 -> N1;
+}
diff --git a/src/test/run-make/graphviz-flowgraph/f23.rs b/src/test/run-make/graphviz-flowgraph/f23.rs
new file mode 100644
index 00000000000..52341a3fbd4
--- /dev/null
+++ b/src/test/run-make/graphviz-flowgraph/f23.rs
@@ -0,0 +1,31 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[allow(unreachable_code)]
+pub fn expr_while_23() {
+    let mut x = 23;
+    let mut y = 23;
+    let mut z = 23;
+
+    while x > 0 {
+        x -= 1;
+
+        while y > 0 {
+            y -= 1;
+
+            while z > 0 { z -= 1; }
+
+            if x > 10 {
+                return;
+                "unreachable";
+            }
+        }
+    }
+}
diff --git a/src/test/run-make/graphviz-flowgraph/f24.dot-expected.dot b/src/test/run-make/graphviz-flowgraph/f24.dot-expected.dot
new file mode 100644
index 00000000000..2558998be6e
--- /dev/null
+++ b/src/test/run-make/graphviz-flowgraph/f24.dot-expected.dot
@@ -0,0 +1,123 @@
+digraph block {
+    N0[label="entry"];
+    N1[label="exit"];
+    N2[label="expr 24"];
+    N3[label="local mut x"];
+    N4[label="expr 24"];
+    N5[label="local mut y"];
+    N6[label="expr 24"];
+    N7[label="local mut z"];
+    N8[label="(dummy_node)"];
+    N9[label="expr loop  {\l    if x == 0 { break ; \"unreachable\"; }\l    x -= 1;\l    loop  {\l        if y == 0 { break ; \"unreachable\"; }\l        y -= 1;\l        loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l        if x > 10 { return; \"unreachable\"; }\l    }\l}\l"];
+    N10[label="expr x"];
+    N11[label="expr 0"];
+    N12[label="expr x == 0"];
+    N13[label="expr break"];
+    N14[label="(dummy_node)"];
+    N15[label="expr \"unreachable\""];
+    N16[label="block { break ; \"unreachable\"; }"];
+    N17[label="expr if x == 0 { break ; \"unreachable\"; }"];
+    N18[label="expr 1"];
+    N19[label="expr x"];
+    N20[label="expr x -= 1"];
+    N21[label="(dummy_node)"];
+    N22[label="expr loop  {\l    if y == 0 { break ; \"unreachable\"; }\l    y -= 1;\l    loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l    if x > 10 { return; \"unreachable\"; }\l}\l"];
+    N23[label="expr y"];
+    N24[label="expr 0"];
+    N25[label="expr y == 0"];
+    N26[label="expr break"];
+    N27[label="(dummy_node)"];
+    N28[label="expr \"unreachable\""];
+    N29[label="block { break ; \"unreachable\"; }"];
+    N30[label="expr if y == 0 { break ; \"unreachable\"; }"];
+    N31[label="expr 1"];
+    N32[label="expr y"];
+    N33[label="expr y -= 1"];
+    N34[label="(dummy_node)"];
+    N35[label="expr loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }"];
+    N36[label="expr z"];
+    N37[label="expr 0"];
+    N38[label="expr z == 0"];
+    N39[label="expr break"];
+    N40[label="(dummy_node)"];
+    N41[label="expr \"unreachable\""];
+    N42[label="block { break ; \"unreachable\"; }"];
+    N43[label="expr if z == 0 { break ; \"unreachable\"; }"];
+    N44[label="expr 1"];
+    N45[label="expr z"];
+    N46[label="expr z -= 1"];
+    N47[label="block { if z == 0 { break ; \"unreachable\"; } z -= 1; }"];
+    N48[label="expr x"];
+    N49[label="expr 10"];
+    N50[label="expr x > 10"];
+    N51[label="expr return"];
+    N52[label="(dummy_node)"];
+    N53[label="expr \"unreachable\""];
+    N54[label="block { return; \"unreachable\"; }"];
+    N55[label="expr if x > 10 { return; \"unreachable\"; }"];
+    N56[label="block {\l    if y == 0 { break ; \"unreachable\"; }\l    y -= 1;\l    loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l    if x > 10 { return; \"unreachable\"; }\l}\l"];
+    N57[label="block {\l    if x == 0 { break ; \"unreachable\"; }\l    x -= 1;\l    loop  {\l        if y == 0 { break ; \"unreachable\"; }\l        y -= 1;\l        loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l        if x > 10 { return; \"unreachable\"; }\l    }\l}\l"];
+    N58[label="block {\l    let mut x = 24;\l    let mut y = 24;\l    let mut z = 24;\l    loop  {\l        if x == 0 { break ; \"unreachable\"; }\l        x -= 1;\l        loop  {\l            if y == 0 { break ; \"unreachable\"; }\l            y -= 1;\l            loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l            if x > 10 { return; \"unreachable\"; }\l        }\l    }\l}\l"];
+    N0 -> N2;
+    N2 -> N3;
+    N3 -> N4;
+    N4 -> N5;
+    N5 -> N6;
+    N6 -> N7;
+    N7 -> N8;
+    N8 -> N10;
+    N10 -> N11;
+    N11 -> N12;
+    N12 -> N13;
+    N13 -> N9[label="exiting scope_0 expr break,\lexiting scope_1 stmt break ;,\lexiting scope_2 block { break ; \"unreachable\"; },\lexiting scope_3 expr if x == 0 { break ; \"unreachable\"; },\lexiting scope_4 stmt if x == 0 { break ; \"unreachable\"; },\lexiting scope_5 block {\l    if x == 0 { break ; \"unreachable\"; }\l    x -= 1;\l    loop  {\l        if y == 0 { break ; \"unreachable\"; }\l        y -= 1;\l        loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l        if x > 10 { return; \"unreachable\"; }\l    }\l}\l"];
+    N14 -> N15;
+    N15 -> N16;
+    N12 -> N17;
+    N16 -> N17;
+    N17 -> N18;
+    N18 -> N19;
+    N19 -> N20;
+    N20 -> N21;
+    N21 -> N23;
+    N23 -> N24;
+    N24 -> N25;
+    N25 -> N26;
+    N26 -> N22[label="exiting scope_0 expr break,\lexiting scope_1 stmt break ;,\lexiting scope_2 block { break ; \"unreachable\"; },\lexiting scope_3 expr if y == 0 { break ; \"unreachable\"; },\lexiting scope_4 stmt if y == 0 { break ; \"unreachable\"; },\lexiting scope_5 block {\l    if y == 0 { break ; \"unreachable\"; }\l    y -= 1;\l    loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l    if x > 10 { return; \"unreachable\"; }\l}\l"];
+    N27 -> N28;
+    N28 -> N29;
+    N25 -> N30;
+    N29 -> N30;
+    N30 -> N31;
+    N31 -> N32;
+    N32 -> N33;
+    N33 -> N34;
+    N34 -> N36;
+    N36 -> N37;
+    N37 -> N38;
+    N38 -> N39;
+    N39 -> N35[label="exiting scope_0 expr break,\lexiting scope_1 stmt break ;,\lexiting scope_2 block { break ; \"unreachable\"; },\lexiting scope_3 expr if z == 0 { break ; \"unreachable\"; },\lexiting scope_4 stmt if z == 0 { break ; \"unreachable\"; },\lexiting scope_5 block { if z == 0 { break ; \"unreachable\"; } z -= 1; }"];
+    N40 -> N41;
+    N41 -> N42;
+    N38 -> N43;
+    N42 -> N43;
+    N43 -> N44;
+    N44 -> N45;
+    N45 -> N46;
+    N46 -> N47;
+    N47 -> N34;
+    N35 -> N48;
+    N48 -> N49;
+    N49 -> N50;
+    N50 -> N51;
+    N51 -> N1[label="exiting scope_0 expr loop  {\l    if y == 0 { break ; \"unreachable\"; }\l    y -= 1;\l    loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l    if x > 10 { return; \"unreachable\"; }\l}\l,\lexiting scope_1 expr loop  {\l    if x == 0 { break ; \"unreachable\"; }\l    x -= 1;\l    loop  {\l        if y == 0 { break ; \"unreachable\"; }\l        y -= 1;\l        loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l        if x > 10 { return; \"unreachable\"; }\l    }\l}\l"];
+    N52 -> N53;
+    N53 -> N54;
+    N50 -> N55;
+    N54 -> N55;
+    N55 -> N56;
+    N56 -> N21;
+    N22 -> N57;
+    N57 -> N8;
+    N9 -> N58;
+    N58 -> N1;
+}
diff --git a/src/test/run-make/graphviz-flowgraph/f24.rs b/src/test/run-make/graphviz-flowgraph/f24.rs
new file mode 100644
index 00000000000..f796d660a18
--- /dev/null
+++ b/src/test/run-make/graphviz-flowgraph/f24.rs
@@ -0,0 +1,36 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[allow(unreachable_code)]
+pub fn expr_while_24() {
+    let mut x = 24;
+    let mut y = 24;
+    let mut z = 24;
+
+    loop {
+        if x == 0 { break; "unreachable"; }
+        x -= 1;
+
+        loop {
+            if y == 0 { break; "unreachable"; }
+            y -= 1;
+
+            loop {
+                if z == 0 { break; "unreachable"; }
+                z -= 1;
+            }
+
+            if x > 10 {
+                return;
+                "unreachable";
+            }
+        }
+    }
+}
diff --git a/src/test/run-make/graphviz-flowgraph/f25.dot-expected.dot b/src/test/run-make/graphviz-flowgraph/f25.dot-expected.dot
new file mode 100644
index 00000000000..c393b63546c
--- /dev/null
+++ b/src/test/run-make/graphviz-flowgraph/f25.dot-expected.dot
@@ -0,0 +1,123 @@
+digraph block {
+    N0[label="entry"];
+    N1[label="exit"];
+    N2[label="expr 25"];
+    N3[label="local mut x"];
+    N4[label="expr 25"];
+    N5[label="local mut y"];
+    N6[label="expr 25"];
+    N7[label="local mut z"];
+    N8[label="(dummy_node)"];
+    N9[label="expr \'a:\l    loop  {\l        if x == 0 { break ; \"unreachable\"; }\l        x -= 1;\l        \'a:\l            loop  {\l                if y == 0 { break ; \"unreachable\"; }\l                y -= 1;\l                \'a: loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l                if x > 10 { continue \'a ; \"unreachable\"; }\l            }\l    }\l"];
+    N10[label="expr x"];
+    N11[label="expr 0"];
+    N12[label="expr x == 0"];
+    N13[label="expr break"];
+    N14[label="(dummy_node)"];
+    N15[label="expr \"unreachable\""];
+    N16[label="block { break ; \"unreachable\"; }"];
+    N17[label="expr if x == 0 { break ; \"unreachable\"; }"];
+    N18[label="expr 1"];
+    N19[label="expr x"];
+    N20[label="expr x -= 1"];
+    N21[label="(dummy_node)"];
+    N22[label="expr \'a:\l    loop  {\l        if y == 0 { break ; \"unreachable\"; }\l        y -= 1;\l        \'a: loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l        if x > 10 { continue \'a ; \"unreachable\"; }\l    }\l"];
+    N23[label="expr y"];
+    N24[label="expr 0"];
+    N25[label="expr y == 0"];
+    N26[label="expr break"];
+    N27[label="(dummy_node)"];
+    N28[label="expr \"unreachable\""];
+    N29[label="block { break ; \"unreachable\"; }"];
+    N30[label="expr if y == 0 { break ; \"unreachable\"; }"];
+    N31[label="expr 1"];
+    N32[label="expr y"];
+    N33[label="expr y -= 1"];
+    N34[label="(dummy_node)"];
+    N35[label="expr \'a: loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }"];
+    N36[label="expr z"];
+    N37[label="expr 0"];
+    N38[label="expr z == 0"];
+    N39[label="expr break"];
+    N40[label="(dummy_node)"];
+    N41[label="expr \"unreachable\""];
+    N42[label="block { break ; \"unreachable\"; }"];
+    N43[label="expr if z == 0 { break ; \"unreachable\"; }"];
+    N44[label="expr 1"];
+    N45[label="expr z"];
+    N46[label="expr z -= 1"];
+    N47[label="block { if z == 0 { break ; \"unreachable\"; } z -= 1; }"];
+    N48[label="expr x"];
+    N49[label="expr 10"];
+    N50[label="expr x > 10"];
+    N51[label="expr continue \'a"];
+    N52[label="(dummy_node)"];
+    N53[label="expr \"unreachable\""];
+    N54[label="block { continue \'a ; \"unreachable\"; }"];
+    N55[label="expr if x > 10 { continue \'a ; \"unreachable\"; }"];
+    N56[label="block {\l    if y == 0 { break ; \"unreachable\"; }\l    y -= 1;\l    \'a: loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l    if x > 10 { continue \'a ; \"unreachable\"; }\l}\l"];
+    N57[label="block {\l    if x == 0 { break ; \"unreachable\"; }\l    x -= 1;\l    \'a:\l        loop  {\l            if y == 0 { break ; \"unreachable\"; }\l            y -= 1;\l            \'a: loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l            if x > 10 { continue \'a ; \"unreachable\"; }\l        }\l}\l"];
+    N58[label="block {\l    let mut x = 25;\l    let mut y = 25;\l    let mut z = 25;\l    \'a:\l        loop  {\l            if x == 0 { break ; \"unreachable\"; }\l            x -= 1;\l            \'a:\l                loop  {\l                    if y == 0 { break ; \"unreachable\"; }\l                    y -= 1;\l                    \'a: loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l                    if x > 10 { continue \'a ; \"unreachable\"; }\l                }\l        }\l}\l"];
+    N0 -> N2;
+    N2 -> N3;
+    N3 -> N4;
+    N4 -> N5;
+    N5 -> N6;
+    N6 -> N7;
+    N7 -> N8;
+    N8 -> N10;
+    N10 -> N11;
+    N11 -> N12;
+    N12 -> N13;
+    N13 -> N9[label="exiting scope_0 expr break,\lexiting scope_1 stmt break ;,\lexiting scope_2 block { break ; \"unreachable\"; },\lexiting scope_3 expr if x == 0 { break ; \"unreachable\"; },\lexiting scope_4 stmt if x == 0 { break ; \"unreachable\"; },\lexiting scope_5 block {\l    if x == 0 { break ; \"unreachable\"; }\l    x -= 1;\l    \'a:\l        loop  {\l            if y == 0 { break ; \"unreachable\"; }\l            y -= 1;\l            \'a: loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l            if x > 10 { continue \'a ; \"unreachable\"; }\l        }\l}\l"];
+    N14 -> N15;
+    N15 -> N16;
+    N12 -> N17;
+    N16 -> N17;
+    N17 -> N18;
+    N18 -> N19;
+    N19 -> N20;
+    N20 -> N21;
+    N21 -> N23;
+    N23 -> N24;
+    N24 -> N25;
+    N25 -> N26;
+    N26 -> N22[label="exiting scope_0 expr break,\lexiting scope_1 stmt break ;,\lexiting scope_2 block { break ; \"unreachable\"; },\lexiting scope_3 expr if y == 0 { break ; \"unreachable\"; },\lexiting scope_4 stmt if y == 0 { break ; \"unreachable\"; },\lexiting scope_5 block {\l    if y == 0 { break ; \"unreachable\"; }\l    y -= 1;\l    \'a: loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l    if x > 10 { continue \'a ; \"unreachable\"; }\l}\l"];
+    N27 -> N28;
+    N28 -> N29;
+    N25 -> N30;
+    N29 -> N30;
+    N30 -> N31;
+    N31 -> N32;
+    N32 -> N33;
+    N33 -> N34;
+    N34 -> N36;
+    N36 -> N37;
+    N37 -> N38;
+    N38 -> N39;
+    N39 -> N35[label="exiting scope_0 expr break,\lexiting scope_1 stmt break ;,\lexiting scope_2 block { break ; \"unreachable\"; },\lexiting scope_3 expr if z == 0 { break ; \"unreachable\"; },\lexiting scope_4 stmt if z == 0 { break ; \"unreachable\"; },\lexiting scope_5 block { if z == 0 { break ; \"unreachable\"; } z -= 1; }"];
+    N40 -> N41;
+    N41 -> N42;
+    N38 -> N43;
+    N42 -> N43;
+    N43 -> N44;
+    N44 -> N45;
+    N45 -> N46;
+    N46 -> N47;
+    N47 -> N34;
+    N35 -> N48;
+    N48 -> N49;
+    N49 -> N50;
+    N50 -> N51;
+    N51 -> N21[label="exiting scope_0 expr continue \'a,\lexiting scope_1 stmt continue \'a ;,\lexiting scope_2 block { continue \'a ; \"unreachable\"; },\lexiting scope_3 expr if x > 10 { continue \'a ; \"unreachable\"; },\lexiting scope_4 block {\l    if y == 0 { break ; \"unreachable\"; }\l    y -= 1;\l    \'a: loop  { if z == 0 { break ; \"unreachable\"; } z -= 1; }\l    if x > 10 { continue \'a ; \"unreachable\"; }\l}\l"];
+    N52 -> N53;
+    N53 -> N54;
+    N50 -> N55;
+    N54 -> N55;
+    N55 -> N56;
+    N56 -> N21;
+    N22 -> N57;
+    N57 -> N8;
+    N9 -> N58;
+    N58 -> N1;
+}
diff --git a/src/test/run-make/graphviz-flowgraph/f25.rs b/src/test/run-make/graphviz-flowgraph/f25.rs
new file mode 100644
index 00000000000..2ee2e48fd10
--- /dev/null
+++ b/src/test/run-make/graphviz-flowgraph/f25.rs
@@ -0,0 +1,36 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[allow(unreachable_code)]
+pub fn expr_while_25() {
+    let mut x = 25;
+    let mut y = 25;
+    let mut z = 25;
+
+    'a: loop {
+        if x == 0 { break; "unreachable"; }
+        x -= 1;
+
+        'a: loop {
+            if y == 0 { break; "unreachable"; }
+            y -= 1;
+
+            'a: loop {
+                if z == 0 { break; "unreachable"; }
+                z -= 1;
+            }
+
+            if x > 10 {
+                continue 'a;
+                "unreachable";
+            }
+        }
+    }
+}