Format using nightly (#79)

.github/workflows/ci.yml

@@ -22,4 +22,5 @@ jobs:
           override: true
           components: rustfmt, clippy
       - uses: Swatinem/rust-cache@v1.2.0
+      - run: make setup
       - run: make test

Makefile

@@ -11,8 +11,8 @@ cukethis: target/debug/mrt  # runs only end-to-end tests with a @this tag
 
 fix: tools/rta@${RUN_THAT_APP_VERSION}  # auto-corrects issues
 	tools/rta dprint fmt
-	cargo fmt
-	cargo fix
+	cargo +nightly fmt
+	cargo +nightly fix --allow-dirty
 
 help:  # shows all available Make commands
 	cat Makefile | grep '^[^ ]*:' | grep -v '.PHONY' | grep -v '.SILENT:' | grep '#' | grep -v help | sed 's/:.*#/#/' | column -s "#" -t
@@ -23,10 +23,14 @@ install:  # installs the binary in the system
 lint: tools/rta@${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
 	git diff --check
 	tools/rta actionlint
 
+setup:  # install development dependencies on this computer
+	rustup toolchain add nightly
+	rustup component add rustfmt --toolchain nightly
+
 test: unit lint cuke  # runs all tests
 
 unit:  # runs the unit tests

src/commands/ignore.rs

@@ -1,6 +1,5 @@
 use crate::config::Config;
 use crate::error::UserError;
-use std::mem::drop;
 use std::process::ExitCode;
 
 pub fn ignore(config: Config) -> Result<(Config, Option<ExitCode>), UserError> {