"module could not be loaded" (Curry) in GenServer example

[smarwei]

I tried to call the example server from an Erlang shell, but could not get it to work.
I'm running ubuntu 18.04 and installed hamler 0.2.2 using the dpkg package.

Before starting the server I registered the node with
start :"hamler@127.0.0.1"

In the Erlang shell I then just executed
gen_server:call({server, 'hamler@127.0.0.1'}, {'Query'}).

Hamler then throws
`
=ERROR REPORT==== 28-Feb-2021::13:13:30.052963 ===
** Generic server server terminating
** Last message in was {'Query'}
** When Server state == {proxy,#{handleCall => #Fun<Demo.Server.3.83583961>,
handleCast => #Fun<Demo.Server.4.83583961>},
{'State',20}}
** Reason for termination ==
** {'module could not be loaded',
[{'Curry',apply,
[#Fun<Demo.Server.3.83583961>,
[{'Query'},
{<8914.93.0>,#Ref<8914.1897630177.680787969.90452>},
{'State',20}]],
[]},
{'Control.Behaviour.GenServer.Proxy',handle_call,3,[]},
{gen_server,try_handle_call,4,[{file,"gen_server.erl"},{line,715}]},
{gen_server,handle_msg,6,[{file,"gen_server.erl"},{line,744}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,226}]}]}
** Client <8914.93.0> is remote on node 'erlang@127.0.0.1'

=CRASH REPORT==== 28-Feb-2021::13:13:30.056272 ===
crasher:
initial call: 'Control.Behaviour.GenServer.Proxy':init/1
pid: <0.83.0>
registered_name: server
exception error: undefined function 'Curry':apply/2
in function 'Control.Behaviour.GenServer.Proxy':handle_call/3
in call from gen_server:try_handle_call/4 (gen_server.erl, line 715)
in call from gen_server:handle_msg/6 (gen_server.erl, line 744)
ancestors: [<0.9.0>]
message_queue_len: 0
messages: []
links: [<0.9.0>]
dictionary: []
trap_exit: false
status: running
heap_size: 4185
stack_size: 28
reductions: 8111
neighbours:
`

[smarwei]

The Erlang part is actually not relevant.
This triggers the problem as well:
`
module Main where

import Prelude
import Demo.Server as Server

main :: IO ()
main = do
_ <- Server.start
_ <- Server.query
pure ()
`

[smarwei]

After installing hamler from source the example is (almost) working.

The only problem left is that it seems that "return" is no longer supported.
After replacing "return" with "pure" in the example code everything works fine.

Many thanks for your great work!

[niltok]

thx for your testing! and return removed like idris because of its confusing name & same usage as pure.