build(ariadne): vendor clap

third_party/crates/once_cell_polyfill-1.70.2/src/lib.rs

@@ -0,0 +1,10 @@
+//! > Polyfill for `OnceCell` stdlib feature for use with older MSRVs
+
+#![warn(clippy::print_stderr)]
+#![warn(clippy::print_stdout)]
+
+pub mod sync;
+
+#[doc = include_str!("../README.md")]
+#[cfg(doctest)]
+pub struct ReadmeDoctests;