refactor: Remove once_cell dependency

Cargo.toml

@@ -70,7 +70,7 @@ suggestions = ["dep:strsim"]
 # Optional
 deprecated = ["clap_derive?/deprecated"] # Guided experience to prepare for next breaking release (at different stages of development, this may become default)
 derive = ["clap_derive"]
-cargo = ["dep:once_cell"] # Disable if you're not using Cargo, enables Cargo-env-var-dependent macros
+cargo = [] # Disable if you're not using Cargo, enables Cargo-env-var-dependent macros
 wrap_help = ["dep:terminal_size", "textwrap/terminal_size"]
 env = [] # Use environment variables during arg parsing
 unicode = ["textwrap/unicode-width", "dep:unicase"]  # Support for unicode characters in arguments and help messages
@@ -95,7 +95,6 @@ atty = { version = "0.2",  optional = true }
 termcolor = { version = "1.1.1", optional = true }
 terminal_size = { version = "0.2.1", optional = true }
 backtrace = { version = "0.3", optional = true }
-once_cell = { version = "1.12.0", optional = true }
 
 [dev-dependencies]
 trybuild = "1.0.18"

src/lib.rs

@@ -129,13 +129,6 @@ pub mod _features;
 #[cfg(feature = "unstable-doc")]
 pub mod _tutorial;
 
-#[doc(hidden)]
-pub mod __macro_refs {
-    #[cfg(feature = "cargo")]
-    #[doc(hidden)]
-    pub use once_cell;
-}
-
 #[macro_use]
 #[allow(missing_docs)]
 mod macros;

src/macros.rs

@@ -46,13 +46,12 @@ macro_rules! crate_version {
 #[macro_export]
 macro_rules! crate_authors {
     ($sep:expr) => {{
-        static CACHED: clap::__macro_refs::once_cell::sync::Lazy<String> =
-            clap::__macro_refs::once_cell::sync::Lazy::new(|| {
-                env!("CARGO_PKG_AUTHORS").replace(':', $sep)
-            });
-
-        let s: &'static str = &*CACHED;
-        s
+        let authors = env!("CARGO_PKG_AUTHORS");
+        if authors.contains(':') {
+            $crate::Str::from(authors.replace(':', $sep))
+        } else {
+            $crate::Str::from(authors)
+        }
     }};
     () => {
         env!("CARGO_PKG_AUTHORS")