Error when compiling 'hello-world': 'error[E0412]: cannot find type Option in this scope'

[CanadaHonk]

After following the steps in the setup guide, I get this error when I try and compile 'libc', specifically '/home/duck/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.46/src/unix/newlib/mod.rs'.

Full output:

warning: Patch `rustc-std-workspace-core v1.0.0 (/home/duck/.rustup/toolchains/nightly-2019-01-19-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/tools/rustc-std-workspace-core)` was not used in the crate graph.
Check that the patched package version and available features are compatible
with the dependency requirements. If the patch has a different version from
what is locked in the Cargo.lock file, run `cargo update` to use the new
version. This may also occur with an optional dependency that is not enabled.
   Compiling core v0.0.0 (/home/duck/.rustup/toolchains/nightly-2019-01-19-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore)
    Finished release [optimized] target(s) in 1m 12s
   Compiling cc v1.0.28
   Compiling core v0.0.0 (/home/duck/.rustup/toolchains/nightly-2019-01-19-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore)
   Compiling compiler_builtins v0.1.4
   Compiling rustc-std-workspace-core v1.0.0 (/home/duck/.rustup/toolchains/nightly-2019-01-19-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/tools/rustc-std-workspace-core)
   Compiling alloc v0.0.0 (/home/duck/.rustup/toolchains/nightly-2019-01-19-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/liballoc)
    Finished release [optimized] target(s) in 1m 41s
warning: dependency (libc) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
   Compiling core v0.0.0 (/home/duck/.rustup/toolchains/nightly-2019-01-19-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore)
   Compiling libc v0.2.46
   Compiling rustc-std-workspace-core v1.0.0 (/home/duck/.rustup/toolchains/nightly-2019-01-19-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/tools/rustc-std-workspace-core)
error[E0412]: cannot find type `Option` in this scope
   --> /home/duck/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.46/src/unix/newlib/mod.rs:723:36
    |
723 |     pub fn pthread_atfork(prepare: Option<unsafe extern fn()>,
    |                                    ^^^^^^ not found in this scope
help: possible candidates are found in other modules, you can import them into scope
    |
1   | use core::option::Option;
    |
1   | use core::prelude::v1::Option;
    |

error[E0412]: cannot find type `Option` in this scope
   --> /home/duck/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.46/src/unix/newlib/mod.rs:724:35
    |
724 |                           parent: Option<unsafe extern fn()>,
    |                                   ^^^^^^ not found in this scope
help: possible candidates are found in other modules, you can import them into scope
    |
1   | use core::option::Option;
    |
1   | use core::prelude::v1::Option;
    |

error[E0412]: cannot find type `Option` in this scope
   --> /home/duck/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.46/src/unix/newlib/mod.rs:725:34
    |
725 |                           child: Option<unsafe extern fn()>) -> ::c_int;
    |                                  ^^^^^^ not found in this scope
help: possible candidates are found in other modules, you can import them into scope
    |
1   | use core::option::Option;
    |
1   | use core::prelude::v1::Option;
    |

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0412`.
error: Could not compile `libc`.

To learn more, run the command again with --verbose.
error: `"cargo" "build" "--release" "--manifest-path" "/tmp/xargo.WlPnFEDyBx1v/Cargo.toml" "--target" "aarch64-horizon-elf" "-p" "libc"` failed with exit code: Some(101)
stack backtrace:
   0: error_chain::make_backtrace::h66e7507f95410765 (0x56342cde2c38)
   1: <error_chain::State as core::default::Default>::default::he5b2882a1d6eb6a1 (0x56342cde2cc6)
   2: <std::process::Command as xargo::extensions::CommandExt>::run::hf608742b45089f1f (0x56342cd9bb30)
   3: xargo::sysroot::build::hd22f93d87cfe7aa2 (0x56342cda3181)
   4: xargo::sysroot::update::h9f4ac14dbf2de905 (0x56342cda5143)
   5: xargo::main::hd59bd6c28f208877 (0x56342cdb65e7)
   6: std::rt::lang_start::{{closure}}::h1dce5d596d152c49 (0x56342cd93143)
   7: std::rt::lang_start_internal::{{closure}}::hc1efa189bf5f6d84 (0x56342ce04433)
             at src/libstd/rt.rs:49
      std::panicking::try::do_call::hc5f4d1e558ca9232
             at src/libstd/panicking.rs:297
   8: __rust_maybe_catch_panic (0x56342ce0ce0a)
             at src/libpanic_unwind/lib.rs:92
   9: std::panicking::try::h0b576e013ac13f04 (0x56342ce04f86)
             at src/libstd/panicking.rs:276
      std::panic::catch_unwind::h3b1d5a0242e6b692
             at src/libstd/panic.rs:388
      std::rt::lang_start_internal::he7135653eea56fd5
             at src/libstd/rt.rs:48
  10: main (0x56342cdb7092)
  11: __libc_start_main (0x7fe0a61f0153)
  12: _start (0x56342cd881ce)
  13: <unknown> (0x0)
Failed to open output file!
Failed to open input!
Generated NRO: /home/duck/rust-examples/hello-world/*.nro```

Rust(up) info:
```rustup show
Default host: x86_64-unknown-linux-gnu
rustup home:  /home/duck/.rustup

installed toolchains
--------------------

nightly-2019-01-19-x86_64-unknown-linux-gnu (default)
nightly-x86_64-unknown-linux-gnu

active toolchain
----------------

nightly-2019-01-19-x86_64-unknown-linux-gnu (default)
rustc 1.33.0-nightly (c76f3c374 2019-01-18)```

Additional Info:
- The first time it (the actual code) compiled, but I didn't have devkitpro installed so making the NRO / post processing failed
- I tried reinstalling Rust and the tools but it still continues to fail
- I've ran the cleaning script (`clean.sh`) after each time but it doesn't help

[leo60228]

That guide is outdated. Try the docker image at rustyhorizon/docker.