Compiling rocket_http v0.4.7 fails with E0107

[573]

Bug report

1. The version of Rocket you're using. Ensure it's the latest, if possible.
   0.4.7

2. The operating system (distribution and version) where the issue occurs.

Linux u 4.4.0-19041-Microsoft #488-Microsoft Mon Sep 01 13:43:00 PST 2020 x86_64 GNU/Linux

3. A brief description of the bug that includes:
   * The nature of the bug.
   It occurs while building (cargo) a project using rocket_http
   * When the bug occurs.
   running cargo build on the example given at https://rocket.rs/v0.4/guide/getting-started/#
   * What you expected vs. what actually happened.
   cargo should build successful, but it fails with:

Compiling rocket_http v0.4.7
Running rustc --crate-name rocket_http /home/dkahlenberg/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rocket_http-0.4.7/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="private-cookies"' -C metadata=1d45e05f4c40de14 -C extra-filename=-1d45e05f4c40de14 --out-dir /home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps -L dependency=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps --extern cookie=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libcookie-88711a7887c74ba3.rmeta --extern hyper=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libhyper-d4edfeadec0ee1ef.rmeta --extern indexmap=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libindexmap-99fc342959722d6b.rmeta --extern pear=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libpear-9a2578c4814e5113.rmeta --extern percent_encoding=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libpercent_encoding-a49f808696dc9385.rmeta --extern smallvec=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libsmallvec-d879f3dc72faadac.rmeta --extern state=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libstate-551fc2cd5865959b.rmeta --extern time=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libtime-fc954b8cf58271a9.rmeta --extern unicode_xid=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libunicode_xid-04f9d636d60cad8c.rmeta --cap-lints allow --sysroot=/nix/store/l38dzrqwkv4b96pnikngnh2nnczawg7s-rust
error[E0107]: wrong number of type arguments: expected 3, found 2
--> /home/dkahlenberg/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rocket_http-0.4.7/src/header.rs:124:14
|
124 | headers: IndexMap<Uncased<'h>, Vec<Cow<'h, str>>>
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected 3 type arguments

error: aborting due to previous error

For more information about this error, try rustc --explain E0107.
error: could not compile rocket_http.

Caused by:
process didn't exit successfully: rustc --crate-name rocket_http /home/dkahlenberg/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/rocket_http-0.4.7/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="private-cookies"' -C metadata=1d45e05f4c40de14 -C extra-filename=-1d45e05f4c40de14 --out-dir /home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps -L dependency=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps --extern cookie=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libcookie-88711a7887c74ba3.rmeta --extern hyper=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libhyper-d4edfeadec0ee1ef.rmeta --extern indexmap=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libindexmap-99fc342959722d6b.rmeta --extern pear=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libpear-9a2578c4814e5113.rmeta --extern percent_encoding=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libpercent_encoding-a49f808696dc9385.rmeta --extern smallvec=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libsmallvec-d879f3dc72faadac.rmeta --extern state=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libstate-551fc2cd5865959b.rmeta --extern time=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libtime-fc954b8cf58271a9.rmeta --extern unicode_xid=/home/dkahlenberg/christine.website-how-i-start-nix-2020-03-08/helloworld/target/debug/deps/libunicode_xid-04f9d636d60cad8c.rmeta --cap-lints allow --sysroot=/nix/store/l38dzrqwkv4b96pnikngnh2nnczawg7s-rust (exit code: 1)

[jebrosen]

I think this is related to indexmap-rs/indexmap#144 since it looks like you are using WSL. On WSL something breaks the "is std available" detection, and you end up with the no_std version of IndexMap.

One workaround you can apply for now is to add the following to your own Cargo.toml:

[dependencies]
indexmap = { version = "1.6.1", features = ["std"] }

We could also work around this in rocket by backporting #1502 to v0.4.

[573]

It would be good to backport this for WSL1 users.
Especially behind corporate proxies or vpns WSL1 might still be easier to handle in the first place.
I needed some patch to use the rust-overlay so I used a modified overlay which in turn missed some of the patches https://github.com/mozilla/nixpkgs-mozilla added, i. e. mozilla/nixpkgs-mozilla#227.
Which has potential to lead to follow-up errors etc.

On WSL2 these errors do not occur.

[SergioBenitez]

@jebrosen I'll leave the decision to backport to you. Please feel free to do so or close this issue.

[SergioBenitez]

@jebrosen What do you think?

[573]

Thanks.