1 files changed, 19 insertions, 0 deletions
diff --git a/third_party/rust/clap_builder/src/builder/arg_predicate.rs b/third_party/rust/clap_builder/src/builder/arg_predicate.rs
new file mode 100644
index 0000000000..bc79a11b78
--- /dev/null
+++ b/third_party/rust/clap_builder/src/builder/arg_predicate.rs
@@ -0,0 +1,19 @@
+use crate::builder::OsStr;
+
+/// Operations to perform on argument values
+///
+/// These do not apply to [`ValueSource::DefaultValue`][crate::parser::ValueSource::DefaultValue]
+#[derive(Clone, Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "unstable-v5", non_exhaustive)]
+pub enum ArgPredicate {
+    /// Is the argument present?
+    IsPresent,
+    /// Does the argument match the specified value?
+    Equals(OsStr),
+}
+
+impl<S: Into<OsStr>> From<S> for ArgPredicate {
+    fn from(other: S) -> Self {
+        Self::Equals(other.into())
+    }
+}