diff --git a/flake.nix b/flake.nix
index b5fc500..b55522c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -92,8 +92,8 @@
           cargo-license
           cargo-tarpaulin
           jq
-          inputs.fenix.packages."x86_64-linux".stable.toolchain
           inputs.fenix.packages."x86_64-linux".latest.rustfmt
+          inputs.fenix.packages."x86_64-linux".stable.toolchain
           linuxPackages_latest.perf
           nodejs
           nodePackages.prettier
diff --git a/rustfmt.toml b/rustfmt.toml
index fa252a1..7d39985 100644
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -21,5 +21,5 @@ struct_field_align_threshold = 999
 unstable_features = true
 use_field_init_shorthand = true
 use_small_heuristics = "Max"
-version = "Two"
+style_edition = "2021"
 wrap_comments = true
diff --git a/src/alejandra/src/builder.rs b/src/alejandra/src/builder.rs
index f8fb830..712568b 100644
--- a/src/alejandra/src/builder.rs
+++ b/src/alejandra/src/builder.rs
@@ -34,7 +34,11 @@ pub(crate) fn build(
     build_step(&mut builder, build_ctx, &crate::builder::Step::Format(element));
 
     if build_ctx.force_wide {
-        if build_ctx.force_wide_success { Some(builder.finish()) } else { None }
+        if build_ctx.force_wide_success {
+            Some(builder.finish())
+        } else {
+            None
+        }
     } else {
         Some(builder.finish())
     }
diff --git a/src/alejandra/src/children.rs b/src/alejandra/src/children.rs
index 2f9864e..be7772a 100644
--- a/src/alejandra/src/children.rs
+++ b/src/alejandra/src/children.rs
@@ -22,7 +22,11 @@ impl Children {
                 matches!(child.kind(), rnix::SyntaxKind::TOKEN_COMMENT)
             });
 
-            if has_comments { Some(build_ctx.pos_old.clone()) } else { None }
+            if has_comments {
+                Some(build_ctx.pos_old.clone())
+            } else {
+                None
+            }
         };
 
         for child in node.children_with_tokens() {
diff --git a/src/alejandra_cli/tests/cli.rs b/src/alejandra_cli/tests/cli.rs
index bab0a02..9de6513 100644
--- a/src/alejandra_cli/tests/cli.rs
+++ b/src/alejandra_cli/tests/cli.rs
@@ -13,24 +13,41 @@ struct TestCase {
 const CASES: &[TestCase] = &[
     TestCase { args: &["--help"], stdin: None },
     TestCase { args: &["--version"], stdin: None },
+    //
     TestCase { args: &[], stdin: None },
+    // changed
+    TestCase { args: &[], stdin: Some("[]") },
     TestCase { args: &["--quiet"], stdin: Some("[]") },
     TestCase { args: &["--quiet", "--quiet"], stdin: Some("[]") },
+    // check unchanged
+    TestCase { args: &["--check"], stdin: Some("[]\n") },
     TestCase { args: &["--check", "--quiet"], stdin: Some("[]\n") },
-    TestCase { args: &["--check", "--quiet"], stdin: Some("[\t]") },
     TestCase { args: &["--check", "--quiet", "--quiet"], stdin: Some("[]\n") },
+    // check changed
+    TestCase { args: &["--check"], stdin: Some("[\t]") },
+    TestCase { args: &["--check", "--quiet"], stdin: Some("[\t]") },
     TestCase { args: &["--check", "--quiet", "--quiet"], stdin: Some("[\t]") },
+    // check error
+    TestCase { args: &[], stdin: Some("[") },
     TestCase { args: &["--quiet"], stdin: Some("[") },
     TestCase { args: &["--quiet", "--quiet"], stdin: Some("[") },
+    // nothing to format
+    TestCase { args: &[".", "--exclude", "."], stdin: None },
     TestCase { args: &[".", "--exclude", ".", "--quiet"], stdin: None },
     TestCase {
         args:  &["--exclude", ".", "--quiet", "--quiet", "--", "."],
         stdin: None,
     },
+    //
+    TestCase { args: &["--check", "tests/inputs/changed.nix"], stdin: None },
     TestCase {
         args:  &["--check", "tests/inputs/changed.nix", "--quiet"],
         stdin: None,
     },
+    TestCase {
+        args:  &["-c", "tests/inputs/changed.nix", "-e", "tests/changed.nix"],
+        stdin: None,
+    },
     TestCase {
         args:  &[
             "-c",
@@ -45,6 +62,7 @@ const CASES: &[TestCase] = &[
         args:  &["--check", "tests/inputs/changed.nix", "-qq"],
         stdin: None,
     },
+    TestCase { args: &["-c", "tests/inputs/unchanged.nix"], stdin: None },
     TestCase {
         args:  &["--check", "tests/inputs/unchanged.nix", "-q"],
         stdin: None,
@@ -53,6 +71,7 @@ const CASES: &[TestCase] = &[
         args:  &["--check", "tests/inputs/unchanged.nix", "-qq"],
         stdin: None,
     },
+    TestCase { args: &["--check", "tests/inputs/error.nix"], stdin: None },
     TestCase {
         args:  &["--check", "tests/inputs/error.nix", "-q"],
         stdin: None,
diff --git a/src/alejandra_cli/tests/output.txt b/src/alejandra_cli/tests/output.txt
index 4ce495d..6b9e39e 100644
--- a/src/alejandra_cli/tests/output.txt
+++ b/src/alejandra_cli/tests/output.txt
@@ -62,6 +62,21 @@ stderr:
 
 exit code: Some(1)
 ===
+args: []
+stdin: "[]"
+stdout:
+  []
+
+stderr:
+  Formatting stdin.
+  Use --help to see all command line options.
+  use --quiet to suppress this and other messages.
+  
+  Success! 1 file was formatted.
+  
+
+exit code: Some(0)
+===
 args: ["--quiet"]
 stdin: "[]"
 stdout:
@@ -74,6 +89,21 @@ stdin: "[]"
 stdout:
   []
 
+exit code: Some(0)
+===
+args: ["--check"]
+stdin: "[]\n"
+stdout:
+  []
+
+stderr:
+  Formatting stdin.
+  Use --help to see all command line options.
+  use --quiet to suppress this and other messages.
+  
+  Congratulations! Your code complies with the Alejandra style.
+  
+
 exit code: Some(0)
 ===
 args: ["--check", "--quiet"]
@@ -83,6 +113,27 @@ stdout:
 
 exit code: Some(0)
 ===
+args: ["--check", "--quiet", "--quiet"]
+stdin: "[]\n"
+stdout:
+  []
+
+exit code: Some(0)
+===
+args: ["--check"]
+stdin: "[\t]"
+stdout:
+  []
+
+stderr:
+  Formatting stdin.
+  Use --help to see all command line options.
+  use --quiet to suppress this and other messages.
+  
+  Alert! 1 file requires formatting.
+
+exit code: Some(2)
+===
 args: ["--check", "--quiet"]
 stdin: "[\t]"
 stdout:
@@ -91,19 +142,27 @@ stdout:
 exit code: Some(2)
 ===
 args: ["--check", "--quiet", "--quiet"]
-stdin: "[]\n"
-stdout:
-  []
-
-exit code: Some(0)
-===
-args: ["--check", "--quiet", "--quiet"]
 stdin: "[\t]"
 stdout:
   []
 
 exit code: Some(2)
 ===
+args: []
+stdin: "["
+stdout:
+  [
+
+stderr:
+  Formatting stdin.
+  Use --help to see all command line options.
+  use --quiet to suppress this and other messages.
+  
+  Failed! 1 error found at:
+  - <anonymous file on stdin>: unexpected end of file
+
+exit code: Some(1)
+===
 args: ["--quiet"]
 stdin: "["
 stdout:
@@ -123,13 +182,47 @@ stdout:
 
 exit code: Some(1)
 ===
+args: [".", "--exclude", "."]
+stderr:
+  Checking style in 0 files using 4 threads.
+  
+  
+  Congratulations! Your code complies with the Alejandra style.
+  
+
+exit code: Some(0)
+===
 args: [".", "--exclude", ".", "--quiet"]
 exit code: Some(0)
 ===
 args: ["--exclude", ".", "--quiet", "--quiet", "--", "."]
 exit code: Some(0)
 ===
+args: ["--check", "tests/inputs/changed.nix"]
+stdout:
+  Requires formatting: tests/inputs/changed.nix
+
+stderr:
+  Checking style in 1 file using 4 threads.
+  
+  
+  Alert! 1 file requires formatting.
+
+exit code: Some(2)
+===
 args: ["--check", "tests/inputs/changed.nix", "--quiet"]
+exit code: Some(2)
+===
+args: ["-c", "tests/inputs/changed.nix", "-e", "tests/changed.nix"]
+stdout:
+  Requires formatting: tests/inputs/changed.nix
+
+stderr:
+  Checking style in 1 file using 4 threads.
+  
+  
+  Alert! 1 file requires formatting.
+
 exit code: Some(2)
 ===
 args: ["-c", "tests/inputs/changed.nix", "-q", "-e", "tests/changed.nix"]
@@ -138,12 +231,32 @@ exit code: Some(2)
 args: ["--check", "tests/inputs/changed.nix", "-qq"]
 exit code: Some(2)
 ===
+args: ["-c", "tests/inputs/unchanged.nix"]
+stderr:
+  Checking style in 1 file using 4 threads.
+  
+  
+  Congratulations! Your code complies with the Alejandra style.
+  
+
+exit code: Some(0)
+===
 args: ["--check", "tests/inputs/unchanged.nix", "-q"]
 exit code: Some(0)
 ===
 args: ["--check", "tests/inputs/unchanged.nix", "-qq"]
 exit code: Some(0)
 ===
+args: ["--check", "tests/inputs/error.nix"]
+stderr:
+  Checking style in 1 file using 4 threads.
+  
+  
+  Failed! 1 error found at:
+  - tests/inputs/error.nix: unexpected end of file
+
+exit code: Some(1)
+===
 args: ["--check", "tests/inputs/error.nix", "-q"]
 stderr: