diff --git a/implementations/rust/oo/benches/codec.rs b/implementations/rust/oo/benches/codec.rs
index f1055ae..90aa4dc 100644
--- a/implementations/rust/oo/benches/codec.rs
+++ b/implementations/rust/oo/benches/codec.rs
@@ -50,7 +50,7 @@ pub fn large_testdata_decoder_with_ann(c: &mut Criterion) {
         let mut bs = vec![];
         fh.read_to_end(&mut bs).ok();
         b.iter(|| {
-            let mut src = BytesBinarySource::new(&bs[..]);
+            let src = BytesBinarySource::new(&bs[..]);
             let mut r = IOValues::new(src.packed()).read_annotations(true);
             while let Some(Ok(_)) = r.next() {}
         })
@@ -63,7 +63,7 @@ pub fn large_testdata_decoder_without_ann(c: &mut Criterion) {
         let mut bs = vec![];
         fh.read_to_end(&mut bs).ok();
         b.iter(|| {
-            let mut src = BytesBinarySource::new(&bs[..]);
+            let src = BytesBinarySource::new(&bs[..]);
             let mut r = IOValues::new(src.packed()).read_annotations(false);
             while let Some(Ok(_)) = r.next() {}
         })
@@ -73,7 +73,7 @@ pub fn large_testdata_decoder_without_ann(c: &mut Criterion) {
 pub fn large_testdata_encoder(c: &mut Criterion) {
     c.bench_function("(oo) encode testdata.bin", |b| {
         let mut fh = io::BufReader::new(File::open("benches/testdata.bin").unwrap());
-        let mut src = IOBinarySource::new(&mut fh);
+        let src = IOBinarySource::new(&mut fh);
         let vs = IOValues::new(src.packed()).read_annotations(true).collect::<Result<Vec<_>, _>>().unwrap();
         b.iter_with_large_drop(|| {
             let mut bs = vec![];
diff --git a/implementations/rust/oo/src/packed/reader.rs b/implementations/rust/oo/src/packed/reader.rs
index 633aac0..cbfbf01 100644
--- a/implementations/rust/oo/src/packed/reader.rs
+++ b/implementations/rust/oo/src/packed/reader.rs
@@ -24,12 +24,12 @@ use super::super::{
     source::BinarySource,
 };
 
-pub struct PackedReader<'de, 'src, S: BinarySource<'de>> {
-    pub source: &'src mut S,
+pub struct PackedReader<'de, S: BinarySource<'de>> {
+    pub source: S,
     phantom: PhantomData<&'de ()>,
 }
 
-impl<'de, 'src, S: BinarySource<'de>> BinarySource<'de> for PackedReader<'de, 'src, S> {
+impl<'de, S: BinarySource<'de>> BinarySource<'de> for PackedReader<'de, S> {
     #[inline(always)]
     fn mark(&mut self) -> io::Result<usize> {
         self.source.mark()
@@ -72,9 +72,9 @@ fn out_of_range<I: Into<BigInt>>(i: I) -> error::Error {
     error::Error::NumberOutOfRange(i.into())
 }
 
-impl<'de, 'src, S: BinarySource<'de>> PackedReader<'de, 'src, S> {
+impl<'de, S: BinarySource<'de>> PackedReader<'de, S> {
     #[inline(always)]
-    pub fn new(source: &'src mut S) -> Self {
+    pub fn new(source: S) -> Self {
         PackedReader { source, phantom: PhantomData }
     }
 
@@ -249,7 +249,7 @@ impl<'de, 'src, S: BinarySource<'de>> PackedReader<'de, 'src, S> {
     }
 }
 
-impl<'de, 'src, S: BinarySource<'de>> Reader<'de> for PackedReader<'de, 'src, S> {
+impl<'de, S: BinarySource<'de>> Reader<'de> for PackedReader<'de, S> {
     fn peek_class(&mut self) -> io::Result<Option<NextToken>> {
         match Tag::try_from(match self.peek()? {
             None => return Ok(None),
diff --git a/implementations/rust/oo/src/source.rs b/implementations/rust/oo/src/source.rs
index ccd8c1b..cdd5204 100644
--- a/implementations/rust/oo/src/source.rs
+++ b/implementations/rust/oo/src/source.rs
@@ -39,11 +39,11 @@ pub trait BinarySource<'de>: Sized {
         })
     }
 
-    fn packed(&mut self) -> super::PackedReader<'de, '_, Self> {
+    fn packed(self) -> super::PackedReader<'de, Self> {
         super::PackedReader::new(self)
     }
 
-    fn text(&mut self) -> super::TextReader<'de, '_, Self> {
+    fn text(self) -> super::TextReader<'de, Self> {
         super::TextReader::new(self)
     }
 }
diff --git a/implementations/rust/oo/src/text/reader.rs b/implementations/rust/oo/src/text/reader.rs
index 960adf2..f382672 100644
--- a/implementations/rust/oo/src/text/reader.rs
+++ b/implementations/rust/oo/src/text/reader.rs
@@ -41,15 +41,15 @@ impl<'r> From<&'r Classification> for NextToken {
     }
 }
 
-pub struct TextReader<'de, 'src, S: BinarySource<'de>> {
-    pub source: &'src mut S,
+pub struct TextReader<'de, S: BinarySource<'de>> {
+    pub source: S,
     classification_cache: Option<Classification>,
     phantom: PhantomData<&'de ()>,
 }
 
-impl<'de, 'src, S: BinarySource<'de>> TextReader<'de, 'src, S>
+impl<'de, S: BinarySource<'de>> TextReader<'de, S>
 {
-    pub fn new(source: &'src mut S) -> Self {
+    pub fn new(source: S) -> Self {
         TextReader {
             source,
             classification_cache: None,
@@ -338,7 +338,7 @@ impl<'de, 'src, S: BinarySource<'de>> TextReader<'de, 'src, S>
     }
 }
 
-impl<'de, 'src, S: BinarySource<'de>> Reader<'de> for TextReader<'de, 'src, S>
+impl<'de, S: BinarySource<'de>> Reader<'de> for TextReader<'de, S>
 {
     fn peek_class(&mut self) -> io::Result<Option<NextToken>> {
         if let Some(a) = &self.classification_cache {