cat > chanbug.go << EOF
package chanbug
var C chan<- (chan int);
EOF

cat > chanbug2.go << EOF
package Bar
import "chanbug"
EOF

8g chanbug.go
8g -I . chanbug2.go

the second compile gives me:

chanbug2.go:4: syntax error near chan


% echo $GOOS
darwin
% echo $GOARCH
386
% hg identify
382a7bb58c03+ tip