编译rcore-fs失败，请问如何解决

[feitboiling]

zhu@ubuntu:~/qemu-4.2.0/rCore-Tutorial$ sudo make
make[1]: 进入目录“/home/zhu/qemu-4.2.0/rCore-Tutorial/user”
Installing rcore-fs-fuse
Updating git repository https://github.com/rcore-os/rcore-fs
Installing rcore-fs-fuse v0.1.0 (https://github.com/rcore-os/rcore-fs#6df6cd24)
Updating crates.io index
Compiling libc v0.2.79
Compiling log v0.4.11
Compiling winapi-build v0.1.1
Compiling cfg-if v0.1.10
Compiling proc-macro2 v1.0.24
Compiling proc-macro2 v0.4.30
Compiling unicode-xid v0.1.0
Compiling winapi v0.2.8
Compiling unicode-xid v0.2.1
Compiling syn v1.0.42
Compiling syn v0.15.44
Compiling spin v0.5.2
Compiling bitflags v1.2.1
Compiling unicode-width v0.1.8
Compiling unicode-segmentation v1.6.0
Compiling either v1.6.1
Compiling radium v0.3.0
Compiling utf8-ranges v0.1.3
Compiling strsim v0.8.0
Compiling proc-macro-hack v0.5.18
Compiling regex-syntax v0.3.9
Compiling vec_map v0.8.2
Compiling static_assertions v0.3.4
Compiling ansi_term v0.11.0
Compiling kernel32-sys v0.2.2
Compiling textwrap v0.11.0
Compiling heck v0.3.1
Compiling bitvec v0.17.4
Compiling log v0.3.9
Compiling quote v1.0.7
Compiling rcore-fs v0.1.0 (/home/zhu/.cargo/git/checkouts/rcore-fs-7fdf258332f6146d/6df6cd2/rcore-fs)
error[E0554]: #![feature] may not be used on the stable release channel
--> rcore-fs/src/lib.rs:2:1
|
2 | #![feature(async_closure)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try rustc --explain E0554.
error: could not compile rcore-fs.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: failed to compile rcore-fs-fuse v0.1.0 (https://github.com/rcore-os/rcore-fs#6df6cd24), intermediate artifacts can be found at /tmp/cargo-installunMg5N

Caused by:
build failed
Makefile:22: recipe for target 'dependency' failed
make[1]: *** [dependency] Error 101
make[1]: 离开目录“/home/zhu/qemu-4.2.0/rCore-Tutorial/user”
Makefile:2: recipe for target 'run' failed
make: *** [run] Error 2

Seems like it only compiles with rust nightly
curl https://sh.rustup.rs -sSf | sh