Use IntoInterator to simplify write_entries() usage

src/bank.rs

@@ -792,10 +792,8 @@ mod tests {
 
     // Write the given entries to a file and then return a file iterator to them.
     fn to_file_iter(entries: impl Iterator<Item = Entry>) -> impl Iterator<Item = Entry> {
-        let entries: Vec<_> = entries.collect();
-
         let mut file = Cursor::new(vec![]);
-        EntryWriter::write_entries(&mut file, &entries).unwrap();
+        EntryWriter::write_entries(&mut file, entries).unwrap();
         file.seek(SeekFrom::Start(0)).unwrap();
 
         let reader = BufReader::new(file);

src/bin/genesis.rs

@@ -26,6 +26,6 @@ fn main() -> Result<(), Box<error::Error>> {
 
     let mint: Mint = serde_json::from_str(&buffer)?;
     let mut writer = stdout();
-    EntryWriter::write_entries(&mut writer, &mint.create_entries())?;
+    EntryWriter::write_entries(&mut writer, mint.create_entries())?;
     Ok(())
 }

src/entry_writer.rs

@@ -19,13 +19,16 @@ impl<'a, W: Write> EntryWriter<'a, W> {
     }
 
     fn write_entry(writer: &mut W, entry: &Entry) -> io::Result<()> {
-        let serialized = serde_json::to_string(&entry).unwrap();
+        let serialized = serde_json::to_string(entry).unwrap();
         writeln!(writer, "{}", serialized)
     }
 
-    pub fn write_entries(writer: &mut W, entries: &[Entry]) -> io::Result<()> {
+    pub fn write_entries<I>(writer: &mut W, entries: I) -> io::Result<()>
+    where
+        I: IntoIterator<Item = Entry>,
+    {
         for entry in entries {
-            Self::write_entry(writer, entry)?;
+            Self::write_entry(writer, &entry)?;
         }
         Ok(())
     }