diff --git a/serde_test/src/assert.rs b/serde_test/src/assert.rs
index 892850e4..5d38270c 100644
--- a/serde_test/src/assert.rs
+++ b/serde_test/src/assert.rs
@@ -7,10 +7,10 @@ use token::Token;
 
 use std::fmt::Debug;
 
-pub fn assert_tokens<T>(value: &T, tokens: Vec<Token<'static>>)
+pub fn assert_tokens<T>(value: &T, tokens: &[Token<'static>])
     where T: Serialize + Deserialize + PartialEq + Debug,
 {
-    assert_ser_tokens(value, &tokens[..]);
+    assert_ser_tokens(value, tokens);
     assert_de_tokens(value, tokens);
 }
 
@@ -32,20 +32,20 @@ pub fn assert_ser_tokens_error<T>(value: &T, tokens: &[Token], error: Error)
     assert_eq!(ser.next_token(), None);
 }
 
-pub fn assert_de_tokens<T>(value: &T, tokens: Vec<Token<'static>>)
+pub fn assert_de_tokens<T>(value: &T, tokens: &[Token<'static>])
     where T: Deserialize + PartialEq + Debug,
 {
-    let mut de = Deserializer::new(tokens.into_iter());
+    let mut de = Deserializer::new(tokens.to_vec().into_iter());
     let v: Result<T, Error> = Deserialize::deserialize(&mut de);
     assert_eq!(v.as_ref(), Ok(value));
     assert_eq!(de.next_token(), None);
 }
 
 // Expect an error deserializing tokens into a T
-pub fn assert_de_tokens_error<T>(tokens: Vec<Token<'static>>, error: Error)
+pub fn assert_de_tokens_error<T>(tokens: &[Token<'static>], error: Error)
     where T: Deserialize + PartialEq + Debug,
 {
-    let mut de = Deserializer::new(tokens.into_iter());
+    let mut de = Deserializer::new(tokens.to_vec().into_iter());
     let v: Result<T, Error> = Deserialize::deserialize(&mut de);
     assert_eq!(v, Err(error));
     // There may be one token left if a peek caused the error
diff --git a/testing/tests/test_annotations.rs b/testing/tests/test_annotations.rs
index 245f0a22..0a795725 100644
--- a/testing/tests/test_annotations.rs
+++ b/testing/tests/test_annotations.rs
@@ -81,7 +81,7 @@ struct DefaultStruct<A, B, C, D, E>
 fn test_default_struct() {
     assert_de_tokens(
         &DefaultStruct { a1: 1, a2: 2, a3: 3, a4: 0, a5: 123 },
-        vec![
+        &[
             Token::StructStart("DefaultStruct", Some(3)),
 
             Token::StructSep,
@@ -110,7 +110,7 @@ fn test_default_struct() {
 
     assert_de_tokens(
         &DefaultStruct { a1: 1, a2: 0, a3: 123, a4: 0, a5: 123 },
-        vec![
+        &[
             Token::StructStart("DefaultStruct", Some(1)),
 
             Token::StructSep,
@@ -144,7 +144,7 @@ enum DefaultEnum<A, B, C, D, E>
 fn test_default_enum() {
     assert_de_tokens(
         &DefaultEnum::Struct { a1: 1, a2: 2, a3: 3, a4: 0, a5: 123 },
-        vec![
+        &[
             Token::EnumMapStart("DefaultEnum", "Struct", Some(5)),
 
             Token::EnumMapSep,
@@ -173,7 +173,7 @@ fn test_default_enum() {
 
     assert_de_tokens(
         &DefaultEnum::Struct { a1: 1, a2: 0, a3: 123, a4: 0, a5: 123 },
-        vec![
+        &[
             Token::EnumMapStart("DefaultEnum", "Struct", Some(5)),
 
             Token::EnumMapSep,
@@ -207,7 +207,7 @@ struct ContainsNoStdDefault<A: MyDefault> {
 fn test_no_std_default() {
     assert_de_tokens(
         &ContainsNoStdDefault { a: NoStdDefault(123) },
-        vec![
+        &[
             Token::StructStart("ContainsNoStdDefault", Some(1)),
             Token::StructEnd,
         ]
@@ -215,7 +215,7 @@ fn test_no_std_default() {
 
     assert_de_tokens(
         &ContainsNoStdDefault { a: NoStdDefault(8) },
-        vec![
+        &[
             Token::StructStart("ContainsNoStdDefault", Some(1)),
 
             Token::StructSep,
@@ -280,7 +280,7 @@ fn test_elt_not_deserialize() {
             c: NotDeserializeStruct(123),
             e: NotDeserializeEnum::Trouble,
         },
-        vec![
+        &[
             Token::StructStart("ContainsNotDeserialize", Some(3)),
             Token::StructEnd,
         ]
@@ -298,7 +298,7 @@ fn test_ignore_unknown() {
     // 'Default' allows unknown. Basic smoke test of ignore...
     assert_de_tokens(
         &DefaultStruct { a1: 1, a2: 2, a3: 3, a4: 0, a5: 123 },
-        vec![
+        &[
             Token::StructStart("DefaultStruct", Some(5)),
 
             Token::StructSep,
@@ -333,7 +333,7 @@ fn test_ignore_unknown() {
     );
 
     assert_de_tokens_error::<DenyUnknown>(
-        vec![
+        &[
             Token::StructStart("DenyUnknown", Some(2)),
 
             Token::StructSep,
@@ -367,7 +367,7 @@ struct RenameStructSerializeDeserialize {
 fn test_rename_struct() {
     assert_tokens(
         &RenameStruct { a1: 1, a2: 2 },
-        vec![
+        &[
             Token::StructStart("Superhero", Some(2)),
 
             Token::StructSep,
@@ -401,7 +401,7 @@ fn test_rename_struct() {
 
     assert_de_tokens(
         &RenameStructSerializeDeserialize { a1: 1, a2: 2 },
-        vec![
+        &[
             Token::StructStart("SuperheroDe", Some(2)),
 
             Token::StructSep,
@@ -449,14 +449,14 @@ enum RenameEnumSerializeDeserialize<A> {
 fn test_rename_enum() {
     assert_tokens(
         &RenameEnum::Batman,
-        vec![
+        &[
             Token::EnumUnit("Superhero", "bruce_wayne"),
         ]
     );
 
     assert_tokens(
         &RenameEnum::Superman(0),
-        vec![
+        &[
             Token::EnumNewType("Superhero", "clark_kent"),
             Token::I8(0),
         ]
@@ -464,7 +464,7 @@ fn test_rename_enum() {
 
     assert_tokens(
         &RenameEnum::WonderWoman(0, 1),
-        vec![
+        &[
             Token::EnumSeqStart("Superhero", "diana_prince", Some(2)),
 
             Token::EnumSeqSep,
@@ -479,7 +479,7 @@ fn test_rename_enum() {
 
     assert_tokens(
         &RenameEnum::Flash { a: 1 },
-        vec![
+        &[
             Token::EnumMapStart("Superhero", "barry_allan", Some(1)),
 
             Token::EnumMapSep,
@@ -515,7 +515,7 @@ fn test_rename_enum() {
             a: 0,
             b: String::new(),
         },
-        vec![
+        &[
             Token::EnumMapStart("SuperheroDe", "jason_todd", Some(2)),
 
             Token::EnumMapSep,
@@ -805,7 +805,7 @@ fn test_deserialize_with_struct() {
             a: 1,
             b: 2,
         },
-        vec![
+        &[
             Token::StructStart("DeserializeWithStruct", Some(2)),
 
             Token::StructSep,
@@ -825,7 +825,7 @@ fn test_deserialize_with_struct() {
             a: 1,
             b: 123,
         },
-        vec![
+        &[
             Token::StructStart("DeserializeWithStruct", Some(2)),
 
             Token::StructSep,
@@ -857,7 +857,7 @@ fn test_deserialize_with_enum() {
             a: 1,
             b: 2,
         },
-        vec![
+        &[
             Token::EnumMapStart("DeserializeWithEnum", "Struct", Some(2)),
 
             Token::EnumMapSep,
@@ -877,7 +877,7 @@ fn test_deserialize_with_enum() {
             a: 1,
             b: 123,
         },
-        vec![
+        &[
             Token::EnumMapStart("DeserializeWithEnum", "Struct", Some(2)),
 
             Token::EnumMapSep,
@@ -896,7 +896,7 @@ fn test_deserialize_with_enum() {
 #[test]
 fn test_missing_renamed_field_struct() {
     assert_de_tokens_error::<RenameStruct>(
-        vec![
+        &[
             Token::StructStart("Superhero", Some(2)),
 
             Token::StructSep,
@@ -909,7 +909,7 @@ fn test_missing_renamed_field_struct() {
     );
 
     assert_de_tokens_error::<RenameStructSerializeDeserialize>(
-        vec![
+        &[
             Token::StructStart("SuperheroDe", Some(2)),
 
             Token::StructSep,
@@ -925,7 +925,7 @@ fn test_missing_renamed_field_struct() {
 #[test]
 fn test_missing_renamed_field_enum() {
     assert_de_tokens_error::<RenameEnum>(
-        vec![
+        &[
             Token::EnumMapStart("Superhero", "barry_allan", Some(1)),
 
             Token::EnumMapEnd,
@@ -934,7 +934,7 @@ fn test_missing_renamed_field_enum() {
     );
 
     assert_de_tokens_error::<RenameEnumSerializeDeserialize<i8>>(
-        vec![
+        &[
             Token::EnumMapStart("SuperheroDe", "jason_todd", Some(2)),
 
             Token::EnumMapSep,
diff --git a/testing/tests/test_de.rs b/testing/tests/test_de.rs
index 3212e74c..fcd17448 100644
--- a/testing/tests/test_de.rs
+++ b/testing/tests/test_de.rs
@@ -76,7 +76,7 @@ macro_rules! declare_error_tests {
     }
 }
 
-fn assert_de_tokens_ignore(ignorable_tokens: Vec<Token<'static>>) {
+fn assert_de_tokens_ignore(ignorable_tokens: &[Token<'static>]) {
     #[derive(PartialEq, Debug, Deserialize)]
     struct IgnoreBase {
         a: i32,
@@ -96,7 +96,7 @@ fn assert_de_tokens_ignore(ignorable_tokens: Vec<Token<'static>>) {
                 Token::Str("ignored")
         ]
         .into_iter()
-        .chain(ignorable_tokens.into_iter())
+        .chain(ignorable_tokens.to_vec().into_iter())
         .chain(vec![
             Token::MapEnd,
         ].into_iter())
@@ -120,103 +120,103 @@ fn assert_de_tokens_ignore(ignorable_tokens: Vec<Token<'static>>) {
 
 declare_tests! {
     test_bool {
-        true => vec![Token::Bool(true)],
-        false => vec![Token::Bool(false)],
+        true => &[Token::Bool(true)],
+        false => &[Token::Bool(false)],
     }
     test_isize {
-        0isize => vec![Token::Isize(0)],
-        0isize => vec![Token::I8(0)],
-        0isize => vec![Token::I16(0)],
-        0isize => vec![Token::I32(0)],
-        0isize => vec![Token::I64(0)],
-        0isize => vec![Token::Usize(0)],
-        0isize => vec![Token::U8(0)],
-        0isize => vec![Token::U16(0)],
-        0isize => vec![Token::U32(0)],
-        0isize => vec![Token::U64(0)],
-        0isize => vec![Token::F32(0.)],
-        0isize => vec![Token::F64(0.)],
+        0isize => &[Token::Isize(0)],
+        0isize => &[Token::I8(0)],
+        0isize => &[Token::I16(0)],
+        0isize => &[Token::I32(0)],
+        0isize => &[Token::I64(0)],
+        0isize => &[Token::Usize(0)],
+        0isize => &[Token::U8(0)],
+        0isize => &[Token::U16(0)],
+        0isize => &[Token::U32(0)],
+        0isize => &[Token::U64(0)],
+        0isize => &[Token::F32(0.)],
+        0isize => &[Token::F64(0.)],
     }
     test_ints {
-        0isize => vec![Token::Isize(0)],
-        0i8 => vec![Token::I8(0)],
-        0i16 => vec![Token::I16(0)],
-        0i32 => vec![Token::I32(0)],
-        0i64 => vec![Token::I64(0)],
+        0isize => &[Token::Isize(0)],
+        0i8 => &[Token::I8(0)],
+        0i16 => &[Token::I16(0)],
+        0i32 => &[Token::I32(0)],
+        0i64 => &[Token::I64(0)],
     }
     test_uints {
-        0usize => vec![Token::Usize(0)],
-        0u8 => vec![Token::U8(0)],
-        0u16 => vec![Token::U16(0)],
-        0u32 => vec![Token::U32(0)],
-        0u64 => vec![Token::U64(0)],
+        0usize => &[Token::Usize(0)],
+        0u8 => &[Token::U8(0)],
+        0u16 => &[Token::U16(0)],
+        0u32 => &[Token::U32(0)],
+        0u64 => &[Token::U64(0)],
     }
     test_floats {
-        0f32 => vec![Token::F32(0.)],
-        0f64 => vec![Token::F64(0.)],
+        0f32 => &[Token::F32(0.)],
+        0f64 => &[Token::F64(0.)],
     }
     test_char {
-        'a' => vec![Token::Char('a')],
-        'a' => vec![Token::Str("a")],
-        'a' => vec![Token::String("a".to_owned())],
+        'a' => &[Token::Char('a')],
+        'a' => &[Token::Str("a")],
+        'a' => &[Token::String("a".to_owned())],
     }
     test_string {
-        "abc".to_owned() => vec![Token::Str("abc")],
-        "abc".to_owned() => vec![Token::String("abc".to_owned())],
-        "a".to_owned() => vec![Token::Char('a')],
+        "abc".to_owned() => &[Token::Str("abc")],
+        "abc".to_owned() => &[Token::String("abc".to_owned())],
+        "a".to_owned() => &[Token::Char('a')],
     }
     test_option {
-        None::<i32> => vec![Token::Unit],
-        None::<i32> => vec![Token::Option(false)],
-        Some(1) => vec![Token::I32(1)],
-        Some(1) => vec![
+        None::<i32> => &[Token::Unit],
+        None::<i32> => &[Token::Option(false)],
+        Some(1) => &[Token::I32(1)],
+        Some(1) => &[
             Token::Option(true),
             Token::I32(1),
         ],
     }
     test_result {
-        Ok::<i32, i32>(0) => vec![
+        Ok::<i32, i32>(0) => &[
             Token::EnumStart("Result"),
             Token::Str("Ok"),
             Token::I32(0),
         ],
-        Err::<i32, i32>(1) => vec![
+        Err::<i32, i32>(1) => &[
             Token::EnumStart("Result"),
             Token::Str("Err"),
             Token::I32(1),
         ],
     }
     test_unit {
-        () => vec![Token::Unit],
-        () => vec![
+        () => &[Token::Unit],
+        () => &[
             Token::SeqStart(Some(0)),
             Token::SeqEnd,
         ],
-        () => vec![
+        () => &[
             Token::SeqStart(None),
             Token::SeqEnd,
         ],
-        () => vec![
+        () => &[
             Token::TupleStructStart("Anything", Some(0)),
             Token::SeqEnd,
         ],
     }
     test_unit_struct {
-        UnitStruct => vec![Token::Unit],
-        UnitStruct => vec![
+        UnitStruct => &[Token::Unit],
+        UnitStruct => &[
             Token::UnitStruct("UnitStruct"),
         ],
-        UnitStruct => vec![
+        UnitStruct => &[
             Token::SeqStart(Some(0)),
             Token::SeqEnd,
         ],
-        UnitStruct => vec![
+        UnitStruct => &[
             Token::SeqStart(None),
             Token::SeqEnd,
         ],
     }
     test_tuple_struct {
-        TupleStruct(1, 2, 3) => vec![
+        TupleStruct(1, 2, 3) => &[
             Token::SeqStart(Some(3)),
                 Token::SeqSep,
                 Token::I32(1),
@@ -228,7 +228,7 @@ declare_tests! {
                 Token::I32(3),
             Token::SeqEnd,
         ],
-        TupleStruct(1, 2, 3) => vec![
+        TupleStruct(1, 2, 3) => &[
             Token::SeqStart(None),
                 Token::SeqSep,
                 Token::I32(1),
@@ -240,7 +240,7 @@ declare_tests! {
                 Token::I32(3),
             Token::SeqEnd,
         ],
-        TupleStruct(1, 2, 3) => vec![
+        TupleStruct(1, 2, 3) => &[
             Token::TupleStructStart("TupleStruct", Some(3)),
                 Token::TupleStructSep,
                 Token::I32(1),
@@ -252,7 +252,7 @@ declare_tests! {
                 Token::I32(3),
             Token::TupleStructEnd,
         ],
-        TupleStruct(1, 2, 3) => vec![
+        TupleStruct(1, 2, 3) => &[
             Token::TupleStructStart("TupleStruct", None),
                 Token::TupleStructSep,
                 Token::I32(1),
@@ -266,14 +266,14 @@ declare_tests! {
         ],
     }
     test_btreeset {
-        BTreeSet::<isize>::new() => vec![
+        BTreeSet::<isize>::new() => &[
             Token::Unit,
         ],
-        BTreeSet::<isize>::new() => vec![
+        BTreeSet::<isize>::new() => &[
             Token::SeqStart(Some(0)),
             Token::SeqEnd,
         ],
-        btreeset![btreeset![], btreeset![1], btreeset![2, 3]] => vec![
+        btreeset![btreeset![], btreeset![1], btreeset![2, 3]] => &[
             Token::SeqStart(Some(3)),
                 Token::SeqSep,
                 Token::SeqStart(Some(0)),
@@ -295,23 +295,23 @@ declare_tests! {
                 Token::SeqEnd,
             Token::SeqEnd,
         ],
-        BTreeSet::<isize>::new() => vec![
+        BTreeSet::<isize>::new() => &[
             Token::UnitStruct("Anything"),
         ],
-        BTreeSet::<isize>::new() => vec![
+        BTreeSet::<isize>::new() => &[
             Token::TupleStructStart("Anything", Some(0)),
             Token::SeqEnd,
         ],
     }
     test_hashset {
-        HashSet::<isize>::new() => vec![
+        HashSet::<isize>::new() => &[
             Token::Unit,
         ],
-        HashSet::<isize>::new() => vec![
+        HashSet::<isize>::new() => &[
             Token::SeqStart(Some(0)),
             Token::SeqEnd,
         ],
-        hashset![1, 2, 3] => vec![
+        hashset![1, 2, 3] => &[
             Token::SeqStart(Some(3)),
                 Token::SeqSep,
                 Token::I32(1),
@@ -323,14 +323,14 @@ declare_tests! {
                 Token::I32(3),
             Token::SeqEnd,
         ],
-        HashSet::<isize>::new() => vec![
+        HashSet::<isize>::new() => &[
             Token::UnitStruct("Anything"),
         ],
-        HashSet::<isize>::new() => vec![
+        HashSet::<isize>::new() => &[
             Token::TupleStructStart("Anything", Some(0)),
             Token::SeqEnd,
         ],
-        hashset![FnvHasher @ 1, 2, 3] => vec![
+        hashset![FnvHasher @ 1, 2, 3] => &[
             Token::SeqStart(Some(3)),
                 Token::SeqSep,
                 Token::I32(1),
@@ -344,14 +344,14 @@ declare_tests! {
         ],
     }
     test_vec {
-        Vec::<isize>::new() => vec![
+        Vec::<isize>::new() => &[
             Token::Unit,
         ],
-        Vec::<isize>::new() => vec![
+        Vec::<isize>::new() => &[
             Token::SeqStart(Some(0)),
             Token::SeqEnd,
         ],
-        vec![vec![], vec![1], vec![2, 3]] => vec![
+        vec![vec![], vec![1], vec![2, 3]] => &[
             Token::SeqStart(Some(3)),
                 Token::SeqSep,
                 Token::SeqStart(Some(0)),
@@ -373,27 +373,27 @@ declare_tests! {
                 Token::SeqEnd,
             Token::SeqEnd,
         ],
-        Vec::<isize>::new() => vec![
+        Vec::<isize>::new() => &[
             Token::UnitStruct("Anything"),
         ],
-        Vec::<isize>::new() => vec![
+        Vec::<isize>::new() => &[
             Token::TupleStructStart("Anything", Some(0)),
             Token::SeqEnd,
         ],
     }
     test_array {
-        [0; 0] => vec![
+        [0; 0] => &[
             Token::Unit,
         ],
-        [0; 0] => vec![
+        [0; 0] => &[
             Token::SeqStart(Some(0)),
             Token::SeqEnd,
         ],
-        [0; 0] => vec![
+        [0; 0] => &[
             Token::SeqArrayStart(0),
             Token::SeqEnd,
         ],
-        ([0; 0], [1], [2, 3]) => vec![
+        ([0; 0], [1], [2, 3]) => &[
             Token::SeqStart(Some(3)),
                 Token::SeqSep,
                 Token::SeqStart(Some(0)),
@@ -415,7 +415,7 @@ declare_tests! {
                 Token::SeqEnd,
             Token::SeqEnd,
         ],
-        ([0; 0], [1], [2, 3]) => vec![
+        ([0; 0], [1], [2, 3]) => &[
             Token::SeqArrayStart(3),
                 Token::SeqSep,
                 Token::SeqArrayStart(0),
@@ -437,22 +437,22 @@ declare_tests! {
                 Token::SeqEnd,
             Token::SeqEnd,
         ],
-        [0; 0] => vec![
+        [0; 0] => &[
             Token::UnitStruct("Anything"),
         ],
-        [0; 0] => vec![
+        [0; 0] => &[
             Token::TupleStructStart("Anything", Some(0)),
             Token::SeqEnd,
         ],
     }
     test_tuple {
-        (1,) => vec![
+        (1,) => &[
             Token::SeqStart(Some(1)),
                 Token::SeqSep,
                 Token::I32(1),
             Token::SeqEnd,
         ],
-        (1, 2, 3) => vec![
+        (1, 2, 3) => &[
             Token::SeqStart(Some(3)),
                 Token::SeqSep,
                 Token::I32(1),
@@ -464,13 +464,13 @@ declare_tests! {
                 Token::I32(3),
             Token::SeqEnd,
         ],
-        (1,) => vec![
+        (1,) => &[
             Token::TupleStart(1),
                 Token::TupleSep,
                 Token::I32(1),
             Token::TupleEnd,
         ],
-        (1, 2, 3) => vec![
+        (1, 2, 3) => &[
             Token::TupleStart(3),
                 Token::TupleSep,
                 Token::I32(1),
@@ -484,21 +484,21 @@ declare_tests! {
         ],
     }
     test_btreemap {
-        BTreeMap::<isize, isize>::new() => vec![
+        BTreeMap::<isize, isize>::new() => &[
             Token::Unit,
         ],
-        BTreeMap::<isize, isize>::new() => vec![
+        BTreeMap::<isize, isize>::new() => &[
             Token::MapStart(Some(0)),
             Token::MapEnd,
         ],
-        btreemap![1 => 2] => vec![
+        btreemap![1 => 2] => &[
             Token::MapStart(Some(1)),
                 Token::MapSep,
                 Token::I32(1),
                 Token::I32(2),
             Token::MapEnd,
         ],
-        btreemap![1 => 2, 3 => 4] => vec![
+        btreemap![1 => 2, 3 => 4] => &[
             Token::MapStart(Some(2)),
                 Token::MapSep,
                 Token::I32(1),
@@ -509,7 +509,7 @@ declare_tests! {
                 Token::I32(4),
             Token::MapEnd,
         ],
-        btreemap![1 => btreemap![], 2 => btreemap![3 => 4, 5 => 6]] => vec![
+        btreemap![1 => btreemap![], 2 => btreemap![3 => 4, 5 => 6]] => &[
             Token::MapStart(Some(2)),
                 Token::MapSep,
                 Token::I32(1),
@@ -529,30 +529,30 @@ declare_tests! {
                 Token::MapEnd,
             Token::MapEnd,
         ],
-        BTreeMap::<isize, isize>::new() => vec![
+        BTreeMap::<isize, isize>::new() => &[
             Token::UnitStruct("Anything"),
         ],
-        BTreeMap::<isize, isize>::new() => vec![
+        BTreeMap::<isize, isize>::new() => &[
             Token::StructStart("Anything", Some(0)),
             Token::MapEnd,
         ],
     }
     test_hashmap {
-        HashMap::<isize, isize>::new() => vec![
+        HashMap::<isize, isize>::new() => &[
             Token::Unit,
         ],
-        HashMap::<isize, isize>::new() => vec![
+        HashMap::<isize, isize>::new() => &[
             Token::MapStart(Some(0)),
             Token::MapEnd,
         ],
-        hashmap![1 => 2] => vec![
+        hashmap![1 => 2] => &[
             Token::MapStart(Some(1)),
                 Token::MapSep,
                 Token::I32(1),
                 Token::I32(2),
             Token::MapEnd,
         ],
-        hashmap![1 => 2, 3 => 4] => vec![
+        hashmap![1 => 2, 3 => 4] => &[
             Token::MapStart(Some(2)),
                 Token::MapSep,
                 Token::I32(1),
@@ -563,7 +563,7 @@ declare_tests! {
                 Token::I32(4),
             Token::MapEnd,
         ],
-        hashmap![1 => hashmap![], 2 => hashmap![3 => 4, 5 => 6]] => vec![
+        hashmap![1 => hashmap![], 2 => hashmap![3 => 4, 5 => 6]] => &[
             Token::MapStart(Some(2)),
                 Token::MapSep,
                 Token::I32(1),
@@ -583,14 +583,14 @@ declare_tests! {
                 Token::MapEnd,
             Token::MapEnd,
         ],
-        HashMap::<isize, isize>::new() => vec![
+        HashMap::<isize, isize>::new() => &[
             Token::UnitStruct("Anything"),
         ],
-        HashMap::<isize, isize>::new() => vec![
+        HashMap::<isize, isize>::new() => &[
             Token::StructStart("Anything", Some(0)),
             Token::MapEnd,
         ],
-        hashmap![FnvHasher @ 1 => 2, 3 => 4] => vec![
+        hashmap![FnvHasher @ 1 => 2, 3 => 4] => &[
             Token::MapStart(Some(2)),
                 Token::MapSep,
                 Token::I32(1),
@@ -603,7 +603,7 @@ declare_tests! {
         ],
     }
     test_struct {
-        Struct { a: 1, b: 2, c: 0 } => vec![
+        Struct { a: 1, b: 2, c: 0 } => &[
             Token::MapStart(Some(3)),
                 Token::MapSep,
                 Token::Str("a"),
@@ -614,7 +614,7 @@ declare_tests! {
                 Token::I32(2),
             Token::MapEnd,
         ],
-        Struct { a: 1, b: 2, c: 0 } => vec![
+        Struct { a: 1, b: 2, c: 0 } => &[
             Token::StructStart("Struct", Some(3)),
                 Token::StructSep,
                 Token::Str("a"),
@@ -625,7 +625,7 @@ declare_tests! {
                 Token::I32(2),
             Token::StructEnd,
         ],
-        Struct { a: 1, b: 2, c: 0 } => vec![
+        Struct { a: 1, b: 2, c: 0 } => &[
             Token::SeqStart(Some(3)),
                 Token::SeqSep,
                 Token::I32(1),
@@ -636,7 +636,7 @@ declare_tests! {
         ],
     }
     test_struct_with_skip {
-        Struct { a: 1, b: 2, c: 0 } => vec![
+        Struct { a: 1, b: 2, c: 0 } => &[
             Token::MapStart(Some(3)),
                 Token::MapSep,
                 Token::Str("a"),
@@ -655,7 +655,7 @@ declare_tests! {
                 Token::I32(4),
             Token::MapEnd,
         ],
-        Struct { a: 1, b: 2, c: 0 } => vec![
+        Struct { a: 1, b: 2, c: 0 } => &[
             Token::StructStart("Struct", Some(3)),
                 Token::StructSep,
                 Token::Str("a"),
@@ -676,18 +676,18 @@ declare_tests! {
         ],
     }
     test_enum_unit {
-        Enum::Unit => vec![
+        Enum::Unit => &[
             Token::EnumUnit("Enum", "Unit"),
         ],
     }
     test_enum_simple {
-        Enum::Simple(1) => vec![
+        Enum::Simple(1) => &[
             Token::EnumNewType("Enum", "Simple"),
             Token::I32(1),
         ],
     }
     test_enum_seq {
-        Enum::Seq(1, 2, 3) => vec![
+        Enum::Seq(1, 2, 3) => &[
             Token::EnumSeqStart("Enum", "Seq", Some(3)),
                 Token::EnumSeqSep,
                 Token::I32(1),
@@ -701,7 +701,7 @@ declare_tests! {
         ],
     }
     test_enum_map {
-        Enum::Map { a: 1, b: 2, c: 3 } => vec![
+        Enum::Map { a: 1, b: 2, c: 3 } => &[
             Token::EnumMapStart("Enum", "Map", Some(3)),
                 Token::EnumMapSep,
                 Token::Str("a"),
@@ -718,24 +718,24 @@ declare_tests! {
         ],
     }
     test_enum_unit_usize {
-        Enum::Unit => vec![
+        Enum::Unit => &[
             Token::EnumStart("Enum"),
             Token::Usize(0),
             Token::Unit,
         ],
     }
     test_enum_unit_bytes {
-        Enum::Unit => vec![
+        Enum::Unit => &[
             Token::EnumStart("Enum"),
             Token::Bytes(b"Unit"),
             Token::Unit,
         ],
     }
     test_box {
-        Box::new(0i32) => vec![Token::I32(0)],
+        Box::new(0i32) => &[Token::I32(0)],
     }
     test_boxed_slice {
-        Box::new([0, 1, 2]) => vec![
+        Box::new([0, 1, 2]) => &[
             Token::SeqStart(Some(3)),
             Token::SeqSep,
             Token::I32(0),
@@ -747,18 +747,18 @@ declare_tests! {
         ],
     }
     test_net_ipv4addr {
-        "1.2.3.4".parse::<net::Ipv4Addr>().unwrap() => vec![Token::Str("1.2.3.4")],
+        "1.2.3.4".parse::<net::Ipv4Addr>().unwrap() => &[Token::Str("1.2.3.4")],
     }
     test_net_ipv6addr {
-        "::1".parse::<net::Ipv6Addr>().unwrap() => vec![Token::Str("::1")],
+        "::1".parse::<net::Ipv6Addr>().unwrap() => &[Token::Str("::1")],
     }
     test_net_socketaddr {
-        "1.2.3.4:1234".parse::<net::SocketAddr>().unwrap() => vec![Token::Str("1.2.3.4:1234")],
-        "1.2.3.4:1234".parse::<net::SocketAddrV4>().unwrap() => vec![Token::Str("1.2.3.4:1234")],
-        "[::1]:1234".parse::<net::SocketAddrV6>().unwrap() => vec![Token::Str("[::1]:1234")],
+        "1.2.3.4:1234".parse::<net::SocketAddr>().unwrap() => &[Token::Str("1.2.3.4:1234")],
+        "1.2.3.4:1234".parse::<net::SocketAddrV4>().unwrap() => &[Token::Str("1.2.3.4:1234")],
+        "[::1]:1234".parse::<net::SocketAddrV6>().unwrap() => &[Token::Str("[::1]:1234")],
     }
     test_path_buf {
-        PathBuf::from("/usr/local/lib") => vec![
+        PathBuf::from("/usr/local/lib") => &[
             Token::String("/usr/local/lib".to_owned()),
         ],
     }
@@ -769,19 +769,19 @@ declare_tests! {
 fn test_net_ipaddr() {
     assert_de_tokens(
         "1.2.3.4".parse::<net::IpAddr>().unwrap(),
-        vec![Token::Str("1.2.3.4")],
+        &[Token::Str("1.2.3.4")],
     );
 }
 
 declare_error_tests! {
     test_unknown_variant<Enum> {
-        vec![
+        &[
             Token::EnumUnit("Enum", "Foo"),
         ],
         Error::UnknownVariant("Foo".to_owned()),
     }
     test_struct_seq_too_long<Struct> {
-        vec![
+        &[
             Token::SeqStart(Some(4)),
                 Token::SeqSep, Token::I32(1),
                 Token::SeqSep, Token::I32(2),
@@ -790,7 +790,7 @@ declare_error_tests! {
         Error::UnexpectedToken(Token::SeqSep),
     }
     test_duplicate_field_struct<Struct> {
-        vec![
+        &[
             Token::MapStart(Some(3)),
                 Token::MapSep,
                 Token::Str("a"),
@@ -802,7 +802,7 @@ declare_error_tests! {
         Error::DuplicateField("a"),
     }
     test_duplicate_field_enum<Enum> {
-        vec![
+        &[
             Token::EnumMapStart("Enum", "Map", Some(3)),
                 Token::EnumMapSep,
                 Token::Str("a"),
diff --git a/testing/tests/test_macros.rs b/testing/tests/test_macros.rs
index 188244c2..ca4dffaa 100644
--- a/testing/tests/test_macros.rs
+++ b/testing/tests/test_macros.rs
@@ -162,7 +162,7 @@ struct DefaultTyParam<T: AssociatedType<X=i32> = i32> {
 fn test_named_unit() {
     assert_tokens(
         &NamedUnit,
-        vec![Token::UnitStruct("NamedUnit")]
+        &[Token::UnitStruct("NamedUnit")]
     );
 }
 
@@ -193,7 +193,7 @@ fn test_ser_named_tuple() {
 fn test_de_named_tuple() {
     assert_de_tokens(
         &DeNamedTuple(5, 6, 7),
-        vec![
+        &[
             Token::SeqStart(Some(3)),
             Token::SeqSep,
             Token::I32(5),
@@ -210,7 +210,7 @@ fn test_de_named_tuple() {
 
     assert_de_tokens(
         &DeNamedTuple(5, 6, 7),
-        vec![
+        &[
             Token::TupleStructStart("DeNamedTuple", Some(3)),
             Token::TupleStructSep,
             Token::I32(5),
@@ -266,7 +266,7 @@ fn test_de_named_map() {
             b: 6,
             c: 7,
         },
-        vec![
+        &[
             Token::StructStart("DeNamedMap", Some(3)),
 
             Token::StructSep,
@@ -380,7 +380,7 @@ fn test_ser_enum_map() {
 fn test_de_enum_unit() {
     assert_tokens(
         &DeEnum::Unit::<u32, u32, u32>,
-        vec![
+        &[
             Token::EnumUnit("DeEnum", "Unit"),
         ],
     );
@@ -404,7 +404,7 @@ fn test_de_enum_seq() {
             e,
             //f,
         ),
-        vec![
+        &[
             Token::EnumSeqStart("DeEnum", "Seq", Some(4)),
 
             Token::EnumSeqSep,
@@ -442,7 +442,7 @@ fn test_de_enum_map() {
             e: e,
             //f: f,
         },
-        vec![
+        &[
             Token::EnumMapStart("DeEnum", "Map", Some(4)),
 
             Token::EnumMapSep,
@@ -517,7 +517,7 @@ fn test_lifetimes() {
 fn test_generic_struct() {
     assert_tokens(
         &GenericStruct { x: 5u32 },
-        vec![
+        &[
             Token::StructStart("GenericStruct", Some(1)),
 
             Token::StructSep,
@@ -533,7 +533,7 @@ fn test_generic_struct() {
 fn test_generic_newtype_struct() {
     assert_tokens(
         &GenericNewTypeStruct(5u32),
-        vec![
+        &[
             Token::StructNewType("GenericNewTypeStruct"),
             Token::U32(5),
         ]
@@ -544,7 +544,7 @@ fn test_generic_newtype_struct() {
 fn test_generic_tuple_struct() {
     assert_tokens(
         &GenericTupleStruct(5u32, 6u32),
-        vec![
+        &[
             Token::TupleStructStart("GenericTupleStruct", Some(2)),
 
             Token::TupleStructSep,
@@ -562,7 +562,7 @@ fn test_generic_tuple_struct() {
 fn test_generic_enum_unit() {
     assert_tokens(
         &GenericEnum::Unit::<u32, u32>,
-        vec![
+        &[
             Token::EnumUnit("GenericEnum", "Unit"),
         ]
     );
@@ -572,7 +572,7 @@ fn test_generic_enum_unit() {
 fn test_generic_enum_newtype() {
     assert_tokens(
         &GenericEnum::NewType::<u32, u32>(5),
-        vec![
+        &[
             Token::EnumNewType("GenericEnum", "NewType"),
             Token::U32(5),
         ]
@@ -583,7 +583,7 @@ fn test_generic_enum_newtype() {
 fn test_generic_enum_seq() {
     assert_tokens(
         &GenericEnum::Seq::<u32, u32>(5, 6),
-        vec![
+        &[
             Token::EnumSeqStart("GenericEnum", "Seq", Some(2)),
 
             Token::EnumSeqSep,
@@ -601,7 +601,7 @@ fn test_generic_enum_seq() {
 fn test_generic_enum_map() {
     assert_tokens(
         &GenericEnum::Map::<u32, u32> { x: 5, y: 6 },
-        vec![
+        &[
             Token::EnumMapStart("GenericEnum", "Map", Some(2)),
 
             Token::EnumMapSep,
@@ -621,7 +621,7 @@ fn test_generic_enum_map() {
 fn test_default_ty_param() {
     assert_tokens(
         &DefaultTyParam::<i32> { phantom: PhantomData },
-        vec![
+        &[
             Token::StructStart("DefaultTyParam", Some(1)),
 
             Token::StructSep,