Add Debug impls for Results (#36)

src/error.rs

@@ -1,5 +1,6 @@
 /// The result of a coding operation on a pair of buffer.
 #[must_use = "Contains a status with potential error information"]
+#[derive(Debug)]
 pub struct BufferResult {
     /// The number of bytes consumed from the input buffer.
     pub consumed_in: usize,
@@ -11,6 +12,7 @@ pub struct BufferResult {
 
 /// The result of a coding operation into a vector.
 #[must_use = "Contains a status with potential error information"]
+#[derive(Debug)]
 pub struct VectorResult {
     /// The number of bytes consumed from the input buffer.
     pub consumed_in: usize,
@@ -23,6 +25,7 @@ pub struct VectorResult {
 /// The result of coding into an output stream.
 #[cfg(feature = "std")]
 #[must_use = "Contains a status with potential error information"]
+#[derive(Debug)]
 pub struct StreamResult {
     /// The total number of bytes consumed from the reader.
     pub bytes_read: usize,