Failure to compile with default_features=false

[glfmn]

I am trying to use scryer_prolog as a library within an application, but I wanted to do so with some measure of sandboxing. As one of the features is called http so I tried disabling the default features, but I have run into this compile error. Given the dependency line:

[dependencies.scryer-prolog]
version = "^0.9.4"
default-features = false

Compiling produces the following error:

   Compiling scryer-prolog v0.9.4
error[E0433]: failed to resolve: use of undeclared crate or module `hostname`
    --> /home/user.cargo/registry/src/index.crates.io-6f17d22bba15001f/scryer-prolog-0.9.4/src/machine/system_calls.rs:1773:27
     |
1773 |         if let Ok(host) = hostname::get() {
     |                           ^^^^^^^^ use of undeclared crate or module `hostname`

For more information about this error, try `rustc --explain E0433`.
error: could not compile `scryer-prolog` (lib) due to 1 previous error

Adding the hostname feature resolves the compile error.

[bakaq]

Which commit are you compiling? This was supposed to be fixed in #2581.

[bakaq]

Oh, you are using it as a dependency! In that case 0.9.4 does indeed still have this problem. I can't see a solution apart from waiting for the next release (which still seems a bit far because it will be big, specially for the library use case) or using Scryer Prolog as a git dependency with a commit after #2581.