diff --git a/tests/rust_source/src/lib.rs b/tests/rust_source/src/lib.rs
index a4a2def0..4db68b57 100644
--- a/tests/rust_source/src/lib.rs
+++ b/tests/rust_source/src/lib.rs
@@ -626,6 +626,100 @@ pub mod rust_source {
                     }
                     _ => {
                         decoder.abort(Error::BadChoice);
+
+                        return;
+                    }
+                }
+            }
+        }
+    }
+
+    /// Type E.
+    pub mod e {
+        use super::super::{Error, Encoder, Decoder};
+
+        #[derive(Debug, PartialEq, Copy, Clone)]
+        pub enum EAB {
+            C(bool)
+        }
+
+        impl Default for EAB {
+            fn default() -> Self {
+                EAB::C(bool::default())
+            }
+        }
+
+        #[derive(Debug, PartialEq, Copy, Clone)]
+        pub enum EA {
+            B(EAB)
+        }
+
+        impl Default for EA {
+            fn default() -> Self {
+                EA::B(EAB::default())
+            }
+        }
+
+        #[derive(Debug, Default, PartialEq, Copy, Clone)]
+        pub struct E {
+            pub a: EA
+        }
+
+        impl E {
+            pub fn encode(&mut self, mut dst: &mut [u8]) -> Result<usize, Error> {
+                let mut encoder = Encoder::new(&mut dst);
+
+                self.encode_inner(&mut encoder);
+
+                encoder.get_result()
+            }
+
+            pub fn decode(&mut self, src: &[u8]) -> Result<usize, Error> {
+                let mut decoder = Decoder::new(&src);
+
+                self.decode_inner(&mut decoder);
+
+                decoder.get_result()
+            }
+
+            pub fn encode_inner(&mut self, encoder: &mut Encoder) {
+                match self.a {
+                    EA::B(value) => {
+                        encoder.append_non_negative_binary_integer(0, 0);
+
+                        match value {
+                            EAB::C(value_2) => {
+                                encoder.append_non_negative_binary_integer(0, 0);
+                                encoder.append_bool(value_2);
+                            }
+                        }
+                    }
+                }
+            }
+
+            pub fn decode_inner(&mut self, decoder: &mut Decoder) {
+                let choice = decoder.read_non_negative_binary_integer(0);
+
+                match choice {
+                    0 => {
+                        let EA::B(ref mut b) = self.a;
+                        let choice_2 = decoder.read_non_negative_binary_integer(0);
+
+                        match choice_2 {
+                            0 => {
+                                *b = EAB::C(decoder.read_bool());
+                            },
+                            _ => {
+                                decoder.abort(Error::BadChoice);
+
+                                return;
+                            }
+                        }
+                    },
+                    _ => {
+                        decoder.abort(Error::BadChoice);
+
+                        return;
                     }
                 }
             }
diff --git a/tests/rust_source/tests/integration_tests.rs b/tests/rust_source/tests/integration_tests.rs
index 9e9b4b15..85542f3d 100644
--- a/tests/rust_source/tests/integration_tests.rs
+++ b/tests/rust_source/tests/integration_tests.rs
@@ -1,5 +1,5 @@
 use rust_source::Error;
-use rust_source::rust_source::{a, b, d};
+use rust_source::rust_source::{a, b, d, e};
 
 #[test]
 fn test_uper_c_source_a() {
@@ -138,11 +138,9 @@ fn test_uper_c_source_b_choice_b() {
     assert_eq!(b.decode(&encoded).unwrap(), encoded.len());
 
     match b {
-
         b::B::B(value) => {
             assert_eq!(value, a);
         },
-
         _ => panic!("")
     }
 }
@@ -253,3 +251,27 @@ fn test_uper_c_source_d_decode_error_bad_enum() {
 
     assert_eq!(d.decode(&encoded), Err(Error::BadEnum));
 }
+
+#[test]
+fn test_uper_c_source_e() {
+    let mut encoded = [0; 1];
+    let mut e: e::E = Default::default();
+
+    // Encode.
+    e.a = e::EA::B(e::EAB::C(true));
+
+    assert_eq!(e.encode(&mut encoded).unwrap(), encoded.len());
+    assert_eq!(encoded[..],
+               [
+                   0x80
+               ][..]);
+
+    // Decode.
+    e = Default::default();
+
+    assert_eq!(e.decode(&encoded).unwrap(), encoded.len());
+
+    let e::EA::B(e::EAB::C(value)) = e.a;
+
+    assert_eq!(value, true);
+}