Syntax error at top-level `if` statements (e.g. `if erlang { ... }`).

[gleam-lang]

Syntax error at top-level `if` statements (e.g. `if erlang { ... }`).

[JeffreyBenjaminBrown]

No worries! I eventually got it working.

I've submitted a pull request that adds some introductory material to the README so that future users have an easier time.

[lpil]

Hi @JeffreyBenjaminBrown , for that version of the stdlib you will need Gleam v0.16.0 which has that conditional compilation syntax

[JeffreyBenjaminBrown]

Thanks for responding so fast, @lpil.

I upgraded to Gleam 16.1 and I'm still getting that error:

jeff@jbb-dell:otp-clone$ gleam --version
gleam 0.16.1

jeff@jbb-dell:otp-clone$ rebar3 --version
rebar 3.17.0 on Erlang/OTP 24 Erts 12.0.4

jeff@jbb-dell:otp-clone$ rebar3 shell
===> Verifying dependencies...

error: Syntax error
   ┌─ /home/jeff/code/concurrent-langs/gleam/by-others/otp-clone/_build/default/lib/gleam_stdlib/src/gleam/int.gleam:34:1
   │
34 │ if erlang {
   │ ^^ I was not expecting this.

Expected one of: An import, const, type, or function.

===> Unable to compile Gleam project

[lpil]

Apologies, I got my versions mixed up. v0.17.0-rc1 is required. If you wish to wait until v0.17.0 is released in the next week or so then the previous version of the stdlib can be used.

[JeffreyBenjaminBrown]

Thanks again! How?

Editing rebar.config to specify version 0.16 instead of 0.17 doesn't seem to do it -- it still downloads stdlib 0.17:

jeff@jbb-dell:otp$ rm _build/ -rf
jeff@jbb-dell:otp$ git --no-pager diff
diff --git a/rebar.config b/rebar.config
index 81b4670..bc0db09 100644
--- a/rebar.config
+++ b/rebar.config
@@ -8,6 +8,6 @@
 {project_plugins, [rebar_gleam]}.

 {deps, [
-    {gleam_stdlib, "~> 0.17"},
+    {gleam_stdlib, "~ 0.16"},
     {gleam_erlang, "~> 0.1"}
 ]}.
jeff@jbb-dell:otp$ rebar3 shell
===> Fetching rebar_gleam v0.1.0
===> Analyzing applications...
===> Compiling rebar_gleam
===> Verifying dependencies...
===> Fetching gleam_erlang v0.1.0
===> Fetching gleam_stdlib v0.17.0

error: Syntax error
   ┌─ /home/jeff/code/concurrent-langs/gleam/by-others/otp/_build/default/lib/gleam_stdlib/src/gleam/int.gleam:34:1
   │
34 │ if erlang {
   │ ^^ I was not expecting this.

Expected one of: An import, const, type, or function.

===> Unable to compile Gleam project
jeff@jbb-dell:otp$

I've tried spelling that in each of the following ways:

{gleam_stdlib, "0.16"},
{gleam_stdlib, "~ 0.16"},
{gleam_stdlib, "~< 0.16"},
{gleam_stdlib, "<~ 0.16"},
{gleam_stdlib, "= 0.16"},

all with the same outcome.

I'd upgrade to v17rc1 but I'm on NixOS and I still don't understand how to create my own packages.

[lpil]

If you've a rebar.lock file I believe it'll use those versions over what is in the config, so you may wish to unlock that dep or delete the lock file entirely.

Sorry about the awkward UX here, we will be replacing rebar with a tool of our own design in the near future.