Error in editor but runs fine ([rustc] use of unstable library feature 'rand' )

[jhertz123]

Version of VSCode: 1.15.1 Version of the extension: 0.4.2 OS: Win 10

Description: I get this error in the editor but it runs and builds fine with cargo run

"[rustc] use of unstable library feature 'rand': use rand from crates.io (see issue #27703)'"

Please see below.

main.rs https://pastebin.com/s8Vm27fX

Cargo.toml https://pastebin.com/raw/ww2AZJy5

Editor screen shot https://imagebin.ca/v/3Z7bNPkIMwNh

Output of the "Rust logging" channel:

DEBUG: Rustup: updateToolchains: this.toolchains=[{"channel":"stable","host":"x86_64-pc-windows-msvc","isDefault":true},{"channel":"nightly","host":"x86_64-pc-windows-msvc","isDefault":false}]
DEBUG: activate: processPossibleSetButMissingUserToolchain: toolchainKind=toolchain
DEBUG: activate: processPossibleSetButMissingUserToolchain: user toolchain is installed
DEBUG: Rustup: updateComponents(stable-x86_64-pc-windows-msvc): components=["cargo-x86_64-pc-windows-msvc (default)","rust-analysis-x86_64-pc-windows-msvc","rust-docs-x86_64-pc-windows-msvc (default)","rust-src","rust-std-aarch64-apple-ios","rust-std-aarch64-linux-android","rust-std-aarch64-unknown-fuchsia","rust-std-aarch64-unknown-linux-gnu","rust-std-arm-linux-androideabi","rust-std-arm-unknown-linux-gnueabi","rust-std-arm-unknown-linux-gnueabihf","rust-std-arm-unknown-linux-musleabi","rust-std-arm-unknown-linux-musleabihf","rust-std-armv7-apple-ios","rust-std-armv7-linux-androideabi","rust-std-armv7-unknown-linux-gnueabihf","rust-std-armv7-unknown-linux-musleabihf","rust-std-armv7s-apple-ios","rust-std-asmjs-unknown-emscripten","rust-std-i386-apple-ios","rust-std-i586-pc-windows-msvc","rust-std-i586-unknown-linux-gnu","rust-std-i686-apple-darwin","rust-std-i686-linux-android","rust-std-i686-pc-windows-gnu","rust-std-i686-pc-windows-msvc","rust-std-i686-unknown-freebsd","rust-std-i686-unknown-linux-gnu","rust-std-i686-unknown-linux-musl","rust-std-mips-unknown-linux-gnu","rust-std-mips-unknown-linux-musl","rust-std-mips64-unknown-linux-gnuabi64","rust-std-mips64el-unknown-linux-gnuabi64","rust-std-mipsel-unknown-linux-gnu","rust-std-mipsel-unknown-linux-musl","rust-std-powerpc-unknown-linux-gnu","rust-std-powerpc64-unknown-linux-gnu","rust-std-powerpc64le-unknown-linux-gnu","rust-std-s390x-unknown-linux-gnu","rust-std-sparc64-unknown-linux-gnu","rust-std-wasm32-unknown-emscripten","rust-std-x86_64-apple-darwin","rust-std-x86_64-apple-ios","rust-std-x86_64-linux-android","rust-std-x86_64-pc-windows-gnu","rust-std-x86_64-pc-windows-msvc (default)","rust-std-x86_64-rumprun-netbsd","rust-std-x86_64-unknown-freebsd","rust-std-x86_64-unknown-fuchsia","rust-std-x86_64-unknown-linux-gnu","rust-std-x86_64-unknown-linux-musl","rust-std-x86_64-unknown-netbsd","rustc-x86_64-pc-windows-msvc (default)",""]
DEBUG: RlsMode: start: enter
DEBUG: RlsMode: start: no RLS executable
DEBUG: RlsMode: start: processPossibleSetButMissingUserToolchain: toolchainKind=nightly toolchain
DEBUG: RlsMode: start: processPossibleSetButMissingUserToolchain: user nightly toolchain is installed
DEBUG: Rustup: updateComponents(nightly-x86_64-pc-windows-msvc): components=["cargo-x86_64-pc-windows-msvc (default)","rls-x86_64-pc-windows-msvc (installed)","rust-analysis-x86_64-pc-windows-msvc (installed)","rust-docs-x86_64-pc-windows-msvc (default)","rust-src","rust-std-aarch64-apple-ios","rust-std-aarch64-linux-android","rust-std-aarch64-unknown-fuchsia","rust-std-aarch64-unknown-linux-gnu","rust-std-arm-linux-androideabi","rust-std-arm-unknown-linux-gnueabi","rust-std-arm-unknown-linux-gnueabihf","rust-std-arm-unknown-linux-musleabi","rust-std-arm-unknown-linux-musleabihf","rust-std-armv7-apple-ios","rust-std-armv7-linux-androideabi","rust-std-armv7-unknown-linux-gnueabihf","rust-std-armv7-unknown-linux-musleabihf","rust-std-armv7s-apple-ios","rust-std-asmjs-unknown-emscripten","rust-std-i386-apple-ios","rust-std-i586-pc-windows-msvc","rust-std-i586-unknown-linux-gnu","rust-std-i686-apple-darwin","rust-std-i686-linux-android","rust-std-i686-pc-windows-gnu","rust-std-i686-pc-windows-msvc","rust-std-i686-unknown-freebsd","rust-std-i686-unknown-linux-gnu","rust-std-i686-unknown-linux-musl","rust-std-mips-unknown-linux-gnu","rust-std-mips-unknown-linux-musl","rust-std-mips64-unknown-linux-gnuabi64","rust-std-mips64el-unknown-linux-gnuabi64","rust-std-mipsel-unknown-linux-gnu","rust-std-mipsel-unknown-linux-musl","rust-std-powerpc-unknown-linux-gnu","rust-std-powerpc64-unknown-linux-gnu","rust-std-powerpc64le-unknown-linux-gnu","rust-std-s390x-unknown-linux-gnu","rust-std-sparc64-unknown-linux-gnu","rust-std-wasm32-unknown-emscripten","rust-std-x86_64-apple-darwin","rust-std-x86_64-apple-ios","rust-std-x86_64-linux-android","rust-std-x86_64-pc-windows-gnu","rust-std-x86_64-pc-windows-msvc (default)","rust-std-x86_64-rumprun-netbsd","rust-std-x86_64-unknown-freebsd","rust-std-x86_64-unknown-fuchsia","rust-std-x86_64-unknown-linux-gnu","rust-std-x86_64-unknown-linux-musl","rust-std-x86_64-unknown-netbsd","rust-std-x86_64-unknown-redox","rustc-x86_64-pc-windows-msvc (default)",""]
DEBUG: RlsMode: processPossiblyMissingRlsComponents: RLS is installed
DEBUG: RlsMode: processPossiblyMissingRlsComponents: rust-analysis is installed
DEBUG: RlsMode: start: User decided not to use rustfmt
DEBUG: RlsMode: start: rlsPath=rustup 
DEBUG: RlsMode: start: env={} 
DEBUG: RlsMode: start: args=["run","nightly-x86_64-pc-windows-msvc","rls"] 
DEBUG: RlsMode: start: revealOutputChannelOn=3 
DEBUG: RlsMode: start: Language Client Manager: start

[trolleyman]

I also got this issue but it resolved itself when I restarted VS Code, for any future travellers. https://github.com/rust-lang-nursery/rls-vscode/issues/98