Manually impl Defaut for CompressionMode

Signed-off-by: tison <[email protected]>

src/block/mod.rs

@@ -23,17 +23,22 @@ use super::liblz4::*;
 use std::io::{Error, ErrorKind, Result};
 
 /// Represents the compression mode do be used.
-#[derive(Default, Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug)]
 pub enum CompressionMode {
     /// High compression with compression parameter
     HIGHCOMPRESSION(i32),
     /// Fast compression with acceleration paramet
     FAST(i32),
     /// Default compression
-    #[default]
     DEFAULT,
 }
 
+impl Default for CompressionMode {
+    fn default() -> Self {
+        CompressionMode::DEFAULT
+    }
+}
+
 /// Returns the size of the buffer that is guaranteed to hold the result of
 /// compressing `uncompressed_size` bytes of in data. Returns std::io::Error
 /// with ErrorKind::InvalidInput if input data is too long to be compressed by lz4.