Format using nightly formatter

Makefile

@@ -17,8 +17,8 @@ cukethis:  # tests only the scenario named "this"
 
 fix: tools/run-that-app@${RUN_THAT_APP_VERSION}  # auto-corrects issues
 	tools/rta dprint fmt
-	cargo fmt
-	cargo fix
+	cargo +nightly fmt
+	cargo +nightly fix
 	cargo clippy --fix
 
 help:  # shows all available Make commands
@@ -30,7 +30,7 @@ install:  # installs the binary in the system
 lint: lint-std-fs tools/run-that-app@${RUN_THAT_APP_VERSION}  # checks formatting
 	tools/rta dprint check
 	cargo clippy --all-targets --all-features -- --deny=warnings
-	cargo fmt -- --check
+	cargo +nightly fmt -- --check
 # cargo udeps   # requires nightly
 	git diff --check
 	tools/rta actionlint
@@ -48,7 +48,7 @@ update-json-schema:  # updates the public JSON Schema for the config file
 	mv tikibase.schema.json doc
 	tools/rta dprint fmt > /dev/null
 
-setup: setup-ci  # prepares this codebase
+setup: setup-ci  # install development dependencies on this computer
 	cargo install cargo-edit cargo-upgrades --locked
 	echo
 	echo PLEASE DO THIS MANUALLY:
@@ -59,6 +59,8 @@ setup: setup-ci  # prepares this codebase
 	echo 3. `cargo install dprint --locked`
 
 setup-ci:  # prepares the CI server
+	rustup toolchain add nightly
+	rustup component add rustfmt --toolchain nightly
 # cargo install cargo-udeps --locked  # requires nightly
 
 update: tools/run-that-app@${RUN_THAT_APP_VERSION}  # updates the dependencies

src/input.rs

@@ -1,7 +1,5 @@
 //! The arguments that can be provided to Tikibase via CLI.
 
-use clap;
-
 /// Linter for Markdown-based knowledge databases
 #[derive(Debug, clap::StructOpt)]
 #[clap(version, about, long_about = None)]