Build core fails due to dependency error about enigma-core

[lacabra]

Seems like it is this very same issue that was reported solved months ago. The appearance of this error coincides with the release of version 0.1.14 of the dependency rustc-demangle 3 days ago, when this issue was reported.

[lacabra]

I confirm that it seems to be something wrong with version 0.1.14 of rustc-demangle, as adding the following to enigma-core/app/Cargo.toml fixes the build:

rustc-demangle = "<0.1.14"

[elichai]

Yep. This always happens when our compiler version gets too old.

Your solution should work, it's not the maintainers fault, because even if he uses cfg's to check for compiler featutes/version it won't work because by our compiler "version number" this feature should be stable already but it's a nightly from before it was stable.
#94 will fix this for another few months.

[lacabra]

Added as a small commit to #118 because after fixing this issue, core wouldn't build for me unless I fixed #118 as well.

Alternatively, add it wherever it makes sense.