diff --git a/Makefile b/Makefile
index 368c98a..8623d38 100644
--- a/Makefile
+++ b/Makefile
@@ -50,7 +50,8 @@ check:
 	cc -o inproc test/inproc.c $(flags)
 	cc -o ipc test/ipc.c $(flags)
 	cc -o tcp test/tcp.c $(flags)
-	./inproc && ./ipc && ./tcp && rm inproc ipc tcp
+	cc -o ch test/ch.c $(flags)
+	./inproc && ./ipc && ./tcp && ./ch && rm inproc ipc tcp ch
 	@echo verified consistent behavior among common transports
 
 run: example.c
diff --git a/test/ch.c b/test/ch.c
new file mode 100644
index 0000000..ac9b67f
--- /dev/null
+++ b/test/ch.c
@@ -0,0 +1,56 @@
+/*
+
+  Copyright (c) 2016 Bent Cardan
+  Copyright (c) 2016 Fatih Kaya
+  Copyright (c) 2016 Martin Sustrik
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"),
+  to deal in the Software without restriction, including without limitation
+  the rights to use, copy, modify, merge, publish, distribute, sublicense,
+  and/or sell copies of the Software, and to permit persons to whom
+  the Software is furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included
+  in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+  IN THE SOFTWARE.
+
+*/
+
+#include <stdio.h>
+#include <libmill.h>
+
+static coroutine void c1 (int i,  chan o) { chs(o, int, ++i);           }
+static coroutine void c2 (chan i, chan o) { chs(o, int, ++chr(i, int)); }
+static coroutine void c3 (chan i, chan o) { chs(o, int, ++chr(i, int)); }
+static coroutine void c4 (chan i, chan o) { chs(o, int, ++chr(i, int)); }
+static coroutine void c5 (chan i, chan o) { chs(o, int, ++chr(i, int)); }
+static coroutine void c6 (chan i, chan o) { chs(o, int, ++chr(i, int)); }
+
+int main (const int argc, const char **argv) {
+
+  chan ch   = chmake(int, 0);
+  chan ch2  = chmake(int, 0);
+  chan ch3  = chmake(int, 0);
+  chan ch4  = chmake(int, 0);
+  chan ch5  = chmake(int, 0);
+  chan ch6  = chmake(int, 0);
+
+  go( c1( 1,    ch)  );
+  go( c2( ch,   ch2) );
+  go( c3( ch2,  ch3) );
+  go( c4( ch3,  ch4) );
+  go( c5( ch4,  ch5) );
+  go( c6( ch5,  ch6) );
+
+  printf("incremented to: %d\n", chr(ch6, int)); // incremented to 7
+
+  return 0;
+}