anyhow crate broken since 0.1.13 about crate2nix HOT 4 CLOSED

these derivations will be built:
  /nix/store/9dccznnszigsnlyqdjcdqk4xyizz6wjx-rust_anyhow-1.0.23.drv
  /nix/store/kggvrg6lmzjw41gxr9hbxb56dnqa6km2-rust_with_anyhow-0.1.0.drv
building '/nix/store/9dccznnszigsnlyqdjcdqk4xyizz6wjx-rust_anyhow-1.0.23.drv'...
unpacking sources
unpacking source archive /nix/store/43ca92c955jib0gpxvdfwswsd5ppzivw-anyhow-1.0.23.tar.gz
source root is anyhow-1.0.23.tar.gz
patching sources
configuring
Building build.rs (anyhow)
Running rustc --crate-name build_script_build build.rs --crate-type bin -C opt-level=3 -C codegen-units=8 --edition 2018 --cfg feature="default" --cfg feature="std" --out-dir target/build/anyhow --emit=dep-info,link -L dependency=target/buildDeps --cap-lints allow --color always
error[E0432]: unresolved import `std::backtrace`
 --> /build/anyhow-1.0.23.tar.gz/target/build/anyhow.out/lib.rs:5:14
  |
5 |     use std::backtrace::{Backtrace, BacktraceStatus};
  |              ^^^^^^^^^ could not find `backtrace` in `std`

error[E0407]: method `backtrace` is not a member of trait `Error`
  --> /build/anyhow-1.0.23.tar.gz/target/build/anyhow.out/lib.rs:19:9
   |
19 | /         fn backtrace(&self) -> Option<&Backtrace> {
20 | |             let backtrace = Backtrace::capture();
21 | |             match backtrace.status() {
22 | |                 BacktraceStatus::Captured | BacktraceStatus::Disabled | _ => {}
23 | |             }
24 | |             unimplemented!()
25 | |         }
   | |_________^ not a member of trait `Error`

error[E0554]: #![feature] may not be used on the stable release channel
 --> /build/anyhow-1.0.23.tar.gz/target/build/anyhow.out/lib.rs:2:5
  |
2 |     #![feature(backtrace)]
  |     ^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0407, E0432, E0554.
For more information about an error, try `rustc --explain E0407`.

building
Building src/lib.rs (anyhow)
Running rustc --crate-name anyhow src/lib.rs --crate-type lib -C opt-level=3 -C codegen-units=8 --edition 2018 -C metadata=5e47fda77d -C extra-filename=-5e47fda77d --cfg feature="default" --cfg feature="std" --out-dir target/lib --emit=dep-info,link -L dependency=target/deps --cap-lints allow -L /build/anyhow-1.0.23.tar.gz/target/build/anyhow.out --color always
error[E0432]: unresolved import `std::backtrace`
 --> src/lib.rs:5:14
  |
5 |     use std::backtrace::{Backtrace, BacktraceStatus};
  |              ^^^^^^^^^ could not find `backtrace` in `std`

error[E0407]: method `backtrace` is not a member of trait `Error`
  --> src/lib.rs:19:9
   |
19 | /         fn backtrace(&self) -> Option<&Backtrace> {
20 | |             let backtrace = Backtrace::capture();
21 | |             match backtrace.status() {
22 | |                 BacktraceStatus::Captured | BacktraceStatus::Disabled | _ => {}
23 | |             }
24 | |             unimplemented!()
25 | |         }
   | |_________^ not a member of trait `Error`

error[E0554]: #![feature] may not be used on the stable release channel
 --> src/lib.rs:2:5
  |
2 |     #![feature(backtrace)]
  |     ^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0407, E0432, E0554.
For more information about an error, try `rustc --explain E0407`.
builder for '/nix/store/9dccznnszigsnlyqdjcdqk4xyizz6wjx-rust_anyhow-1.0.23.drv' failed with exit code 1
cannot build derivation '/nix/store/kggvrg6lmzjw41gxr9hbxb56dnqa6km2-rust_with_anyhow-0.1.0.drv': 1 dependencies couldn't be built
error: build of '/nix/store/kggvrg6lmzjw41gxr9hbxb56dnqa6km2-rust_with_anyhow-0.1.0.drv' failed