[dev-dependencies] are not taken into account

[rohel01]

Fedora 25 x86_64
VSCode 1.14.2
Rust (rls) 0.1.0

Rust toolchain installed with rustup and up to date.

Dependencies added in the [dev-dependencies] section of the Cargo.toml are not picked up by the Rust (rls) extension. I get the following error

severity: 'Error'
message: 'use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, and unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead? (see issue #27812)'
at: '7,1'
source: 'rustc'

If I move the dependency in the [dependencies] section and restart VScode (see #98), the error goes away.

[nrc]

cc rust-lang/rls#169

[Xanewok]

This works as expected and was fixed with rust-lang/rls#801.

[phra]

is this happening again?