Unable to compile with Network support

[alessio-proietti]

I'm working with this env:

rustup --version
rustup 1.23.1 (3df2264a9 2020-11-30)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active rustc version is rustc 1.50.0-nightly (11c94a197 2020-12-21)

I added to Cargo.toml these lines:

[target.'cfg(target_os = "hermit")'.dependencies]
hermit-sys = "0.1.*"
default-features = false
features = ["smoltcp"]

First the IDE complains but that's ok for me, the fact is also the compiler doens't build, that's the error:

$ HERMIT_IP="10.0.5.100" cargo build -Z build-std=std,core,alloc,panic_abort --target x86_64-unknown-hermit

error: failed to parse manifest at /home/me/hello_world/Cargo.toml

Caused by:
invalid type: boolean false, expected a version string like "0.9.8" or a detailed dependency like { version = "0.9.8" } for key

target.cfg(target_os = "hermit").dependencies.default-features

I dind't expect this at this basic level.

++EDIT++
This works, consider to review the doc. I can do it anyway.

[target.'cfg(target_os = "hermit")'.dependencies.hermit-sys]
version = "0.1.*"
default-features = false
features = ["smoltcp"]