diff --git a/src/format/parse.rs b/src/format/parse.rs
index cfe75ce..dbd0f91 100644
--- a/src/format/parse.rs
+++ b/src/format/parse.rs
@@ -291,9 +291,9 @@ pub fn parse<'a, I>(parsed: &mut Parsed, mut s: &str, items: I) -> ParseResult<(
 
                     LowerAmPm | UpperAmPm => {
                         if s.len() < 2 { return Err(TOO_SHORT); }
-                        let ampm = match [s.as_bytes()[0] | 32, s.as_bytes()[1] | 32] {
-                            [b'a',b'm'] => false,
-                            [b'p',b'm'] => true,
+                        let ampm = match (s.as_bytes()[0] | 32, s.as_bytes()[1] | 32) {
+                            (b'a',b'm') => false,
+                            (b'p',b'm') => true,
                             _ => return Err(INVALID)
                         };
                         try!(parsed.set_ampm(ampm));
diff --git a/src/format/scan.rs b/src/format/scan.rs
index c62efdc..39f48c5 100644
--- a/src/format/scan.rs
+++ b/src/format/scan.rs
@@ -64,19 +64,19 @@ pub fn nanosecond(s: &str) -> ParseResult<(&str, i64)> {
 pub fn short_month0(s: &str) -> ParseResult<(&str, u8)> {
     if s.len() < 3 { return Err(TOO_SHORT); }
     let buf = s.as_bytes();
-    let month0 = match [buf[0] | 32, buf[1] | 32, buf[2] | 32] {
-        [b'j',b'a',b'n'] => 0,
-        [b'f',b'e',b'b'] => 1,
-        [b'm',b'a',b'r'] => 2,
-        [b'a',b'p',b'r'] => 3,
-        [b'm',b'a',b'y'] => 4,
-        [b'j',b'u',b'n'] => 5,
-        [b'j',b'u',b'l'] => 6,
-        [b'a',b'u',b'g'] => 7,
-        [b's',b'e',b'p'] => 8,
-        [b'o',b'c',b't'] => 9,
-        [b'n',b'o',b'v'] => 10,
-        [b'd',b'e',b'c'] => 11,
+    let month0 = match (buf[0] | 32, buf[1] | 32, buf[2] | 32) {
+        (b'j',b'a',b'n') => 0,
+        (b'f',b'e',b'b') => 1,
+        (b'm',b'a',b'r') => 2,
+        (b'a',b'p',b'r') => 3,
+        (b'm',b'a',b'y') => 4,
+        (b'j',b'u',b'n') => 5,
+        (b'j',b'u',b'l') => 6,
+        (b'a',b'u',b'g') => 7,
+        (b's',b'e',b'p') => 8,
+        (b'o',b'c',b't') => 9,
+        (b'n',b'o',b'v') => 10,
+        (b'd',b'e',b'c') => 11,
         _ => return Err(INVALID)
     };
     Ok((&s[3..], month0))
@@ -86,14 +86,14 @@ pub fn short_month0(s: &str) -> ParseResult<(&str, u8)> {
 pub fn short_weekday(s: &str) -> ParseResult<(&str, Weekday)> {
     if s.len() < 3 { return Err(TOO_SHORT); }
     let buf = s.as_bytes();
-    let weekday = match [buf[0] | 32, buf[1] | 32, buf[2] | 32] {
-        [b'm',b'o',b'n'] => Weekday::Mon,
-        [b't',b'u',b'e'] => Weekday::Tue,
-        [b'w',b'e',b'd'] => Weekday::Wed,
-        [b't',b'h',b'u'] => Weekday::Thu,
-        [b'f',b'r',b'i'] => Weekday::Fri,
-        [b's',b'a',b't'] => Weekday::Sat,
-        [b's',b'u',b'n'] => Weekday::Sun,
+    let weekday = match (buf[0] | 32, buf[1] | 32, buf[2] | 32) {
+        (b'm',b'o',b'n') => Weekday::Mon,
+        (b't',b'u',b'e') => Weekday::Tue,
+        (b'w',b'e',b'd') => Weekday::Wed,
+        (b't',b'h',b'u') => Weekday::Thu,
+        (b'f',b'r',b'i') => Weekday::Fri,
+        (b's',b'a',b't') => Weekday::Sat,
+        (b's',b'u',b'n') => Weekday::Sun,
         _ => return Err(INVALID)
     };
     Ok((&s[3..], weekday))
@@ -167,6 +167,14 @@ pub fn colon_or_space(s: &str) -> ParseResult<&str> {
 /// between hours and minutes, and should return either a new suffix or `Err` when parsing fails.
 pub fn timezone_offset<F>(mut s: &str, mut colon: F) -> ParseResult<(&str, i32)>
         where F: FnMut(&str) -> ParseResult<&str> {
+    fn digits(s: &str) -> ParseResult<(u8, u8)> {
+        let b = s.as_bytes();
+        if b.len() < 2 {
+            Err(TOO_SHORT)
+        } else {
+            Ok((b[0], b[1]))
+        }
+    }
     let negative = match s.as_bytes().first() {
         Some(&b'+') => false,
         Some(&b'-') => true,
@@ -176,9 +184,8 @@ pub fn timezone_offset<F>(mut s: &str, mut colon: F) -> ParseResult<(&str, i32)>
     s = &s[1..];
 
     // hours (00--99)
-    let hours = match s.as_bytes() {
-        [h1 @ b'0'...b'9', h2 @ b'0'...b'9', ..] => ((h1 - b'0') * 10 + (h2 - b'0')) as i32,
-        [] | [_] => return Err(TOO_SHORT),
+    let hours = match try!(digits(s)) {
+        (h1 @ b'0'...b'9', h2 @ b'0'...b'9') => ((h1 - b'0') * 10 + (h2 - b'0')) as i32,
         _ => return Err(INVALID),
     };
     s = &s[2..];
@@ -187,10 +194,9 @@ pub fn timezone_offset<F>(mut s: &str, mut colon: F) -> ParseResult<(&str, i32)>
     s = try!(colon(s));
 
     // minutes (00--59)
-    let minutes = match s.as_bytes() {
-        [m1 @ b'0'...b'5', m2 @ b'0'...b'9', ..] => ((m1 - b'0') * 10 + (m2 - b'0')) as i32,
-        [b'6'...b'9', b'0'...b'9', ..] => return Err(OUT_OF_RANGE),
-        [] | [_] => return Err(TOO_SHORT),
+    let minutes = match try!(digits(s)) {
+        (m1 @ b'0'...b'5', m2 @ b'0'...b'9') => ((m1 - b'0') * 10 + (m2 - b'0')) as i32,
+        (b'6'...b'9', b'0'...b'9') => return Err(OUT_OF_RANGE),
         _ => return Err(INVALID),
     };
     s = &s[2..];
diff --git a/src/lib.rs b/src/lib.rs
index d22db86..92cee67 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -267,7 +267,6 @@ Advanced time zone handling is not yet supported (but is planned in 0.3).
 
 #![doc(html_root_url = "https://lifthrasiir.github.io/rust-chrono/")]
 
-#![feature(slice_patterns)]
 #![feature(core, std_misc, zero_one)] // lib stability features as per RFC #507
 #![cfg_attr(test, feature(test))] // ditto
 #![deny(missing_docs)]