feat(api): convert Infallible to RuntimeError

Author: KSXGitHub

src/runtime_error.rs

@@ -1,4 +1,5 @@
 use derive_more::{Display, Error};
+use std::convert::Infallible;
 
 /// Error caused by the CLI program.
 #[derive(Debug, Display, Error)]
@@ -32,3 +33,9 @@ pub enum UnsupportedFeature {
     #[display("Feature --deduplicate-hardlinks is not available on this platform")]
     DeduplicateHardlink,
 }
+
+impl From<Infallible> for RuntimeError {
+    fn from(value: Infallible) -> Self {
+        match value {}
+    }
+}