warning: unused manifest key: package.categories

[sunjay]

This is my Cargo.toml file:

[package]
name = "brain"
version = "0.0.1"
authors = ["Sunjay Varma <[email protected]>"]
description = "Compiler for the brain programming language. Compiles brain into optimized brainfuck code. Also includes a brainfuck interpreter."
repository = "https://github.com/sunjay/brain"
readme = "README.md"
keywords = ["brain", "brainfuck", "compiler", "interpreter", "optimizer"]
# crates.io/category_slugs
categories = ["command-line-interface"]
license = "MIT"

[dependencies]
clap = "^2.0"

[dependencies.nom]
version = "^2.0"
features = ["verbose-errors"]

[[bin]]
name = "brain"
doc = false

[[bin]]
name = "brainfuck"

Every time I run cargo run, I get the following output:

$ cargo run --bin brain
warning: unused manifest key: package.categories
   Compiling brain v0.0.1 (file:///~/Documents/projects/brain)
    Finished debug [unoptimized + debuginfo] target(s) in 3.78 secs
     Running `target/debug/brain`
...blah...

The warning probably shouldn't be there because package.categories is a valid key as documented in The Manifest Format.

[sfackler]

Your version of cargo is presumably too old to have category support.

[sunjay]

@sfackler Have categories landed in stable? I notice that if I use rustup override set nightly, the warning disappears but then if I unset and use the default (stable), I get the warning again.

$ cargo --version
cargo 0.15.0-nightly (298a012 2016-12-20)
$ cargo build
warning: unused manifest key: package.categories
    Finished debug [unoptimized + debuginfo] target(s) in 0.0 secs

[sfackler]

The PR adding them merged 11 days ago, so it is not in the stable release: #3301

[sunjay]

@sfackler Okay. This doesn't seem to be much of an issue then since the warning will go away when #3301 lands in stable. Looks like @briansmith commented in that pull request about this.

[alexcrichton]

Yes the fields here are supported, just in nightly Rust right now and not yet on stable. I believe there's other bugs about the docs mismatch, but otherwise this is working as intended so I'm going to close. Thanks though for the report!