rodrimati1992

The [readme is rendered wrong in docs.rs](https://docs.rs/crate/const_format/0.2.4) ,if somebody can figure out how to fix it, I'll merge the pull request.

Add option to build with stable

14

https://docs.rs/crate/abi_stable/0.8.0/builds abi_stable https://docs.rs/crate/abi_stable/0.8.0/builds/203164 It also failed on my computer (in nightly-2019-12-03-x86_64-unknown-linux-gnu) with the same error and this backtrace Backtrace ``` error: internal compiler error: src/librustc/hir/def.rs:385: attempted .def_id() on invalid res:...