Terminal issue on linux amd64

[gazzelle123]

FBC version 1.07.1.
Platform: linux amd64.
Distro: Linux Mint 18.3 Sylvia.
Compile this program:

open cons for input as #1
open cons for output as #2
dim shared lin as string
sub process()
print #2, chr(lin[0])
end sub
if not eof(1) then
line input #1, lin
end if
while not eof(1)
process()
line input #1, lin
wend

And try following:
$ ./test | ./test
$ cat >input
1234
^D
$ ./test <input

That isn't working.