diff --git a/clap_complete/src/macros.rs b/clap_complete/src/macros.rs
index bc697946..f9e529d9 100644
--- a/clap_complete/src/macros.rs
+++ b/clap_complete/src/macros.rs
@@ -1,12 +1,3 @@
-macro_rules! w {
-    ($buf:expr, $to_w:expr) => {
-        match $buf.write_all($to_w) {
-            Ok(..) => (),
-            Err(..) => panic!("Failed to write to generated file"),
-        }
-    };
-}
-
 #[cfg(feature = "debug")]
 macro_rules! debug {
     ($($arg:tt)*) => {
diff --git a/clap_complete/src/shells/bash.rs b/clap_complete/src/shells/bash.rs
index a8b8fb1d..5da32d14 100644
--- a/clap_complete/src/shells/bash.rs
+++ b/clap_complete/src/shells/bash.rs
@@ -20,10 +20,9 @@ impl Generator for Bash {
 
         let fn_name = bin_name.replace('-', "__");
 
-        w!(
+        write!(
             buf,
-            format!(
-                "_{name}() {{
+            "_{name}() {{
     local i cur prev opts cmd
     COMPREPLY=()
     cur=\"${{COMP_WORDS[COMP_CWORD]}}\"
@@ -66,15 +65,13 @@ else
     complete -F _{name} -o bashdefault -o default {name}
 fi
 ",
-                name = bin_name,
-                cmd = fn_name,
-                name_opts = all_options_for_path(cmd, bin_name),
-                name_opts_details = option_details_for_path(cmd, bin_name),
-                subcmds = all_subcommands(cmd, &fn_name),
-                subcmd_details = subcommand_details(cmd)
-            )
-            .as_bytes()
-        );
+            name = bin_name,
+            cmd = fn_name,
+            name_opts = all_options_for_path(cmd, bin_name),
+            name_opts_details = option_details_for_path(cmd, bin_name),
+            subcmds = all_subcommands(cmd, &fn_name),
+            subcmd_details = subcommand_details(cmd)
+        ).expect("failed to write completion file");
     }
 }
 
@@ -274,22 +271,23 @@ fn all_options_for_path(cmd: &Command, path: &str) -> String {
 
     let mut opts = String::new();
     for short in utils::shorts_and_visible_aliases(p) {
-        write!(&mut opts, "-{short} ").unwrap();
+        write!(&mut opts, "-{short} ").expect("writing to String is infallible");
     }
     for long in utils::longs_and_visible_aliases(p) {
-        write!(&mut opts, "--{long} ").unwrap();
+        write!(&mut opts, "--{long} ").expect("writing to String is infallible");
     }
     for pos in p.get_positionals() {
         if let Some(vals) = utils::possible_values(pos) {
             for value in vals {
-                write!(&mut opts, "{} ", value.get_name()).unwrap();
+                write!(&mut opts, "{} ", value.get_name())
+                    .expect("writing to String is infallible");
             }
         } else {
-            write!(&mut opts, "{pos} ").unwrap();
+            write!(&mut opts, "{pos} ").expect("writing to String is infallible");
         }
     }
     for (sc, _) in utils::subcommands(p) {
-        write!(&mut opts, "{sc} ").unwrap();
+        write!(&mut opts, "{sc} ").expect("writing to String is infallible");
     }
     opts.pop();
 
diff --git a/clap_complete/src/shells/elvish.rs b/clap_complete/src/shells/elvish.rs
index eb81e78b..b41f035e 100644
--- a/clap_complete/src/shells/elvish.rs
+++ b/clap_complete/src/shells/elvish.rs
@@ -22,7 +22,8 @@ impl Generator for Elvish {
 
         let subcommands_cases = generate_inner(cmd, "");
 
-        let result = format!(
+        write!(
+            buf,
             r#"
 use builtin;
 use str;
@@ -46,9 +47,8 @@ set edit:completion:arg-completer[{bin_name}] = {{|@words|
     $completions[$command]
 }}
 "#,
-        );
-
-        w!(buf, result.as_bytes());
+        )
+        .expect("failed to write completion file");
     }
 }
 
diff --git a/clap_complete/src/shells/fish.rs b/clap_complete/src/shells/fish.rs
index 25404c6b..a87dd1d5 100644
--- a/clap_complete/src/shells/fish.rs
+++ b/clap_complete/src/shells/fish.rs
@@ -42,7 +42,7 @@ impl Generator for Fish {
             needs_fn_name,
             using_fn_name,
         );
-        w!(buf, buffer.as_bytes());
+        write!(buf, "{buffer}").expect("failed to write completion file");
     }
 }
 
@@ -240,7 +240,9 @@ fn gen_subcommand_helpers(
         }
     }
     let optspecs_fn_name = format!("__fish_{bin_name}_global_optspecs");
-    let template = format!("\
+    write!(
+        buf,
+        "\
         # Print an optspec for argparse to handle cmd's options that are independent of any subcommand.\n\
         function {optspecs_fn_name}\n\
         \tstring join \\n{optspecs}\n\
@@ -264,8 +266,7 @@ fn gen_subcommand_helpers(
         \tand return 1\n\
         \tcontains -- $cmd[1] $argv\n\
         end\n\n\
-    ");
-    w!(buf, template.as_bytes());
+    ").expect("failed to write completion file");
 }
 
 fn value_completion(option: &Arg) -> String {
diff --git a/clap_complete/src/shells/powershell.rs b/clap_complete/src/shells/powershell.rs
index efc78aba..0b718657 100644
--- a/clap_complete/src/shells/powershell.rs
+++ b/clap_complete/src/shells/powershell.rs
@@ -22,7 +22,8 @@ impl Generator for PowerShell {
 
         let subcommands_cases = generate_inner(cmd, "");
 
-        let result = format!(
+        write!(
+            buf,
             r#"
 using namespace System.Management.Automation
 using namespace System.Management.Automation.Language
@@ -51,9 +52,8 @@ Register-ArgumentCompleter -Native -CommandName '{bin_name}' -ScriptBlock {{
         Sort-Object -Property ListItemText
 }}
 "#
-        );
-
-        w!(buf, result.as_bytes());
+        )
+        .expect("failed to write completion file");
     }
 }
 
diff --git a/clap_complete/src/shells/zsh.rs b/clap_complete/src/shells/zsh.rs
index 51048130..6b0e2dc1 100644
--- a/clap_complete/src/shells/zsh.rs
+++ b/clap_complete/src/shells/zsh.rs
@@ -19,10 +19,9 @@ impl Generator for Zsh {
             .get_bin_name()
             .expect("crate::generate should have set the bin_name");
 
-        w!(
+        write!(
             buf,
-            format!(
-                "#compdef {name}
+            "#compdef {name}
 
 autoload -U is-at-least
 
@@ -49,13 +48,12 @@ else
     compdef _{name} {name}
 fi
 ",
-                name = bin_name,
-                initial_args = get_args_of(cmd, None),
-                subcommands = get_subcommands_of(cmd),
-                subcommand_details = subcommand_details(cmd)
-            )
-            .as_bytes()
-        );
+            name = bin_name,
+            initial_args = get_args_of(cmd, None),
+            subcommands = get_subcommands_of(cmd),
+            subcommand_details = subcommand_details(cmd)
+        )
+        .expect("failed to write completion file");
     }
 }