Fixes compilation with nim 2 and the test-script

[hoijui]

No description provided.

[hoijui]

This fixes issue #57.

[oprypin]

Thanks. Just one issue:
You are supposedly fixing 2 things, but the continuous test has 0 errors - how can that be explained?
https://github.com/docopt/docopt.nim/actions/runs/6129309785/job/16637279989

[hoijui]

The "testing: ..." fix was required on my machine, because without it, it would pickup regex 0.19.0, instead of regex 0.21.0. Both of these are installed on my system, but for some reason, nim picks the older, and nimble the newer version. On CI, we start with a bare system and install only what is needed, so only regex 0.21.0 is installed, and thus both nim and nimble work equally well. That is my explanation at least.

The GC-safe part however ... :/
strange. it at least happened for @RokkuCode and me, but apparently not on CI with the same nim version ...
I first saw the issue when trying to compile my software that uses docopt on CI, using nim 2.0.0.

[RokkuCode]

The GC-part. Because the tests are doing things differently. I made the following script with the minimal example of the Naval Fate - and it crashes. I run this script in a fresh docker container (debian bookworm). there was never a nim version installed because its fresh debian docker image.

put this test in a separate test step and look it it compiles. if it does not, there must an error. because where should the error in the code on this minimal example on a freshly installed os without any nim installed earlier.

#!/bin/bash

apt update && apt upgrade -y
apt install build-essential curl git wget
curl https://nim-lang.org/choosenim/init.sh -sSf | sh -s -- -y
export PATH=/root/.nimble/bin:$PATH
nimble install -y docopt
mkdir test && cd test
cat << EOF > ./test.nim
let doc = """
Naval Fate.

Usage:
  naval_fate ship new <name>...
  naval_fate ship <name> move <x> <y> [--speed=<kn>]
  naval_fate ship shoot <x> <y>
  naval_fate mine (set|remove) <x> <y> [--moored | --drifting]
  naval_fate (-h | --help)
  naval_fate --version

Options:
  -h --help     Show this screen.
  --version     Show version.
  --speed=<kn>  Speed in knots [default: 10].
  --moored      Moored (anchored) mine.
  --drifting    Drifting mine.
"""

import strutils
import docopt

let args = docopt(doc, version = "Naval Fate 2.0")
EOF

nim c test.nim

Result:

Hint: used config file '/root/.choosenim/toolchains/nim-2.0.0/config/nim.cfg' [Conf]
Hint: used config file '/root/.choosenim/toolchains/nim-2.0.0/config/config.nims' [Conf]
....................................................................................................................................................
/root/.nimble/pkgs2/docopt-0.7.0-21150284640b882fa91147181c52da3e5bb44df8/docopt.nim(608, 6) Error: 'docopt' is not GC-safe as it calls 'docopt_exc'