# create debian container
$ docker run -d --rm --name rl-debian -v ./rl-data:/data rust:slim sh -c 'cargo install rustlings; rustup component add clippy; echo "READY"; tail -f /.dockerenv'

# create alpine container
$ docker run -d --rm --name rl-alpine -v ./rl-data:/data rust:alpine sh -c 'apk add build-base musl-dev; cargo install rustlings; rustup component add clippy; echo "READY"; tail -f /.dockerenv'

# ... wait for container builds to finish ...

# init rustlings (once, containers share the same folder)
$ docker exec -it -w /data rl-debian rustlings init

# take ownership of local folder
$ sudo chmod 777 ./rl-data -R

# fix if1
$ editor ./rl-data/rustlings/exercises/03_if/if1.rs

# run if1 using the debian container, this should work if you fixed if1 correctly
$ docker exec -it -w /data/rustlings rl-debian rustlings run if1
... shortened ...
✓ Successfully ran exercises/03_if/if1.rs

# run if1 using the alpine container
$ docker exec -it -w /data/rustlings rl-alpine rustlings run if1

error: output of --print=file-names missing when learning about target-specific information from rustc
command was: `/usr/local/rustup/toolchains/1.79.0-x86_64-unknown-linux-musl/bin/rustc - --crate-name ___ --print=file-names -A warnings --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=split-debuginfo --print=crate-name --print=cfg`

--- stdout
___
lib___.rlib
lib___.a
lib___.so
/usr/local/rustup/toolchains/1.79.0-x86_64-unknown-linux-musl
off
packed
unpacked
___
debug_assertions
panic="unwind"
proc_macro
target_abi=""
target_arch="x86_64"
target_endian="little"
target_env="musl"
target_family="unix"
target_feature="fxsr"
target_feature="sse"
target_feature="sse2"
target_has_atomic="16"
target_has_atomic="32"
target_has_atomic="64"
target_has_atomic="8"
target_has_atomic="ptr"
target_os="linux"
target_pointer_width="64"
target_vendor="unknown"
unix