cleanup: &foo[0..a] -> &foo[..a]

Author: Jorge Aparicio

src/libcollections/slice.rs

@@ -1631,7 +1631,7 @@ mod tests {
     #[test]
     fn test_slice_from() {
         let vec: &[int] = &[1, 2, 3, 4];
-        assert_eq!(&vec[0..], vec);
+        assert_eq!(&vec[], vec);
         let b: &[int] = &[3, 4];
         assert_eq!(&vec[2..], b);
         let b: &[int] = &[];
@@ -1641,11 +1641,11 @@ mod tests {
     #[test]
     fn test_slice_to() {
         let vec: &[int] = &[1, 2, 3, 4];
-        assert_eq!(&vec[0..4], vec);
+        assert_eq!(&vec[..4], vec);
         let b: &[int] = &[1, 2];
-        assert_eq!(&vec[0..2], b);
+        assert_eq!(&vec[..2], b);
         let b: &[int] = &[];
-        assert_eq!(&vec[0..0], b);
+        assert_eq!(&vec[..0], b);
     }
 
 
@@ -2538,15 +2538,15 @@ mod tests {
             let (left, right) = values.split_at_mut(2);
             {
                 let left: &[_] = left;
-                assert!(left[0..left.len()] == [1, 2][]);
+                assert!(left[..left.len()] == [1, 2][]);
             }
             for p in left.iter_mut() {
                 *p += 1;
             }
 
             {
                 let right: &[_] = right;
-                assert!(right[0..right.len()] == [3, 4, 5][]);
+                assert!(right[..right.len()] == [3, 4, 5][]);
             }
             for p in right.iter_mut() {
                 *p += 2;

src/libcollections/str.rs

@@ -807,7 +807,7 @@ pub trait StrExt: Index<FullRange, Output = str> {
     /// out of bounds.
     ///
     /// See also `slice`, `slice_from` and `slice_chars`.
-    #[unstable = "use slice notation [0..a] instead"]
+    #[unstable = "use slice notation [..a] instead"]
     fn slice_to(&self, end: uint) -> &str {
         core_str::StrExt::slice_to(&self[], end)
     }

src/libcollections/string.rs

@@ -168,7 +168,7 @@ impl String {
 
         if i > 0 {
             unsafe {
-                res.as_mut_vec().push_all(&v[0..i])
+                res.as_mut_vec().push_all(&v[..i])
             };
         }
 

src/libcore/fmt/float.rs

@@ -332,5 +332,5 @@ pub fn float_to_str_bytes_common<T: Float, U, F>(
         }
     }
 
-    f(unsafe { str::from_utf8_unchecked(&buf[0..end]) })
+    f(unsafe { str::from_utf8_unchecked(&buf[..end]) })
 }

src/libcore/fmt/mod.rs

@@ -449,7 +449,7 @@ impl<'a> Formatter<'a> {
             for c in sign.into_iter() {
                 let mut b = [0; 4];
                 let n = c.encode_utf8(&mut b).unwrap_or(0);
-                let b = unsafe { str::from_utf8_unchecked(&b[0..n]) };
+                let b = unsafe { str::from_utf8_unchecked(&b[..n]) };
                 try!(f.buf.write_str(b));
             }
             if prefixed { f.buf.write_str(prefix) }
@@ -692,7 +692,7 @@ impl String for char {
     fn fmt(&self, f: &mut Formatter) -> Result {
         let mut utf8 = [0u8; 4];
         let amt = self.encode_utf8(&mut utf8).unwrap_or(0);
-        let s: &str = unsafe { mem::transmute(&utf8[0..amt]) };
+        let s: &str = unsafe { mem::transmute(&utf8[..amt]) };
         String::fmt(s, f)
     }
 }

src/libcore/slice.rs

@@ -159,7 +159,7 @@ impl<T> SliceExt for [T] {
 
     #[inline]
     fn split_at(&self, mid: uint) -> (&[T], &[T]) {
-        (&self[0..mid], &self[mid..])
+        (&self[..mid], &self[mid..])
     }
 
     #[inline]
@@ -240,7 +240,7 @@ impl<T> SliceExt for [T] {
 
     #[inline]
     fn init(&self) -> &[T] {
-        &self[0..(self.len() - 1)]
+        &self[..(self.len() - 1)]
     }
 
     #[inline]
@@ -443,7 +443,7 @@ impl<T> SliceExt for [T] {
     #[inline]
     fn starts_with(&self, needle: &[T]) -> bool where T: PartialEq {
         let n = needle.len();
-        self.len() >= n && needle == &self[0..n]
+        self.len() >= n && needle == &self[..n]
     }
 
     #[inline]
@@ -972,7 +972,7 @@ impl<'a, T, P> Iterator for Split<'a, T, P> where P: FnMut(&T) -> bool {
         match self.v.iter().position(|x| (self.pred)(x)) {
             None => self.finish(),
             Some(idx) => {
-                let ret = Some(&self.v[0..idx]);
+                let ret = Some(&self.v[..idx]);
                 self.v = &self.v[(idx + 1)..];
                 ret
             }
@@ -999,7 +999,7 @@ impl<'a, T, P> DoubleEndedIterator for Split<'a, T, P> where P: FnMut(&T) -> boo
             None => self.finish(),
             Some(idx) => {
                 let ret = Some(&self.v[(idx + 1)..]);
-                self.v = &self.v[0..idx];
+                self.v = &self.v[..idx];
                 ret
             }
         }
@@ -1195,7 +1195,7 @@ impl<'a, T> Iterator for Windows<'a, T> {
         if self.size > self.v.len() {
             None
         } else {
-            let ret = Some(&self.v[0..self.size]);
+            let ret = Some(&self.v[..self.size]);
             self.v = &self.v[1..];
             ret
         }

src/libcore/str/mod.rs

@@ -701,10 +701,10 @@ impl TwoWaySearcher {
         //
         // What's going on is we have some critical factorization (u, v) of the
         // needle, and we want to determine whether u is a suffix of
-        // &v[0..period]. If it is, we use "Algorithm CP1". Otherwise we use
+        // &v[..period]. If it is, we use "Algorithm CP1". Otherwise we use
         // "Algorithm CP2", which is optimized for when the period of the needle
         // is large.
-        if &needle[0..crit_pos] == &needle[period.. period + crit_pos] {
+        if &needle[..crit_pos] == &needle[period.. period + crit_pos] {
             TwoWaySearcher {
                 crit_pos: crit_pos,
                 period: period,
@@ -1412,7 +1412,7 @@ impl StrExt for str {
     #[inline]
     fn starts_with(&self, needle: &str) -> bool {
         let n = needle.len();
-        self.len() >= n && needle.as_bytes() == &self.as_bytes()[0..n]
+        self.len() >= n && needle.as_bytes() == &self.as_bytes()[..n]
     }
 
     #[inline]

src/libcoretest/char.rs

@@ -167,7 +167,7 @@ fn test_encode_utf8() {
     fn check(input: char, expect: &[u8]) {
         let mut buf = [0u8; 4];
         let n = input.encode_utf8(buf.as_mut_slice()).unwrap_or(0);
-        assert_eq!(&buf[0..n], expect);
+        assert_eq!(&buf[..n], expect);
     }
 
     check('x', &[0x78]);
@@ -181,7 +181,7 @@ fn test_encode_utf16() {
     fn check(input: char, expect: &[u16]) {
         let mut buf = [0u16; 2];
         let n = input.encode_utf16(buf.as_mut_slice()).unwrap_or(0);
-        assert_eq!(&buf[0..n], expect);
+        assert_eq!(&buf[..n], expect);
     }
 
     check('x', &[0x0078]);

src/libcoretest/iter.rs

@@ -288,39 +288,39 @@ fn test_iterator_len() {
     let v: &[_] = &[0i, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
     assert_eq!(v[..4].iter().count(), 4);
     assert_eq!(v[..10].iter().count(), 10);
-    assert_eq!(v[0..0].iter().count(), 0);
+    assert_eq!(v[..0].iter().count(), 0);
 }
 
 #[test]
 fn test_iterator_sum() {
     let v: &[_] = &[0i, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
     assert_eq!(v[..4].iter().map(|&x| x).sum(), 6);
     assert_eq!(v.iter().map(|&x| x).sum(), 55);
-    assert_eq!(v[0..0].iter().map(|&x| x).sum(), 0);
+    assert_eq!(v[..0].iter().map(|&x| x).sum(), 0);
 }
 
 #[test]
 fn test_iterator_product() {
     let v: &[_] = &[0i, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
-    assert_eq!(v[0..4].iter().map(|&x| x).product(), 0);
+    assert_eq!(v[..4].iter().map(|&x| x).product(), 0);
     assert_eq!(v[1..5].iter().map(|&x| x).product(), 24);
-    assert_eq!(v[0..0].iter().map(|&x| x).product(), 1);
+    assert_eq!(v[..0].iter().map(|&x| x).product(), 1);
 }
 
 #[test]
 fn test_iterator_max() {
     let v: &[_] = &[0i, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
-    assert_eq!(v[0..4].iter().map(|&x| x).max(), Some(3));
+    assert_eq!(v[..4].iter().map(|&x| x).max(), Some(3));
     assert_eq!(v.iter().map(|&x| x).max(), Some(10));
-    assert_eq!(v[0..0].iter().map(|&x| x).max(), None);
+    assert_eq!(v[..0].iter().map(|&x| x).max(), None);
 }
 
 #[test]
 fn test_iterator_min() {
     let v: &[_] = &[0i, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
-    assert_eq!(v[0..4].iter().map(|&x| x).min(), Some(0));
+    assert_eq!(v[..4].iter().map(|&x| x).min(), Some(0));
     assert_eq!(v.iter().map(|&x| x).min(), Some(0));
-    assert_eq!(v[0..0].iter().map(|&x| x).min(), None);
+    assert_eq!(v[..0].iter().map(|&x| x).min(), None);
 }
 
 #[test]
@@ -373,7 +373,7 @@ fn test_all() {
     assert!(v.iter().all(|&x| x < 10));
     assert!(!v.iter().all(|&x| x % 2 == 0));
     assert!(!v.iter().all(|&x| x > 100));
-    assert!(v[0..0].iter().all(|_| panic!()));
+    assert!(v[..0].iter().all(|_| panic!()));
 }
 
 #[test]
@@ -382,7 +382,7 @@ fn test_any() {
     assert!(v.iter().any(|&x| x < 10));
     assert!(v.iter().any(|&x| x % 2 == 0));
     assert!(!v.iter().any(|&x| x > 100));
-    assert!(!v[0..0].iter().any(|_| panic!()));
+    assert!(!v[..0].iter().any(|_| panic!()));
 }
 
 #[test]

src/libfmt_macros/lib.rs

@@ -286,7 +286,7 @@ impl<'a> Parser<'a> {
             flags: 0,
             precision: CountImplied,
             width: CountImplied,
-            ty: &self.input[0..0],
+            ty: &self.input[..0],
         };
         if !self.consume(':') { return spec }
 
@@ -395,7 +395,7 @@ impl<'a> Parser<'a> {
                 self.cur.next();
                 pos
             }
-            Some(..) | None => { return &self.input[0..0]; }
+            Some(..) | None => { return &self.input[..0]; }
         };
         let mut end;
         loop {

src/librand/lib.rs

@@ -270,8 +270,7 @@ pub trait Rng : Sized {
     /// let choices = [1i, 2, 4, 8, 16, 32];
     /// let mut rng = thread_rng();
     /// println!("{:?}", rng.choose(&choices));
-    /// # // uncomment when slicing syntax is stable
-    /// //assert_eq!(rng.choose(&choices[0..0]), None);
+    /// assert_eq!(rng.choose(&choices[..0]), None);
     /// ```
     fn choose<'a, T>(&mut self, values: &'a [T]) -> Option<&'a T> {
         if values.is_empty() {

src/librbml/io.rs

@@ -95,7 +95,7 @@ impl Writer for SeekableMemWriter {
             // there (left), and what will be appended on the end (right)
             let cap = self.buf.len() - self.pos;
             let (left, right) = if cap <= buf.len() {
-                (&buf[0..cap], &buf[cap..])
+                (&buf[..cap], &buf[cap..])
             } else {
                 let result: (_, &[_]) = (buf, &[]);
                 result

src/librustc/middle/check_match.rs

@@ -926,7 +926,7 @@ pub fn specialize<'a>(cx: &MatchCheckCtxt, r: &[&'a Pat],
         }
     };
     head.map(|mut head| {
-        head.push_all(&r[0..col]);
+        head.push_all(&r[..col]);
         head.push_all(&r[(col + 1)..]);
         head
     })

src/librustc/util/ppaux.rs

@@ -542,7 +542,7 @@ pub fn parameterized<'tcx>(cx: &ctxt<'tcx>,
         0
     };
 
-    for t in tps[0..(tps.len() - num_defaults)].iter() {
+    for t in tps[..(tps.len() - num_defaults)].iter() {
         strs.push(ty_to_string(cx, *t))
     }
 

src/librustc_back/sha2.rs

@@ -140,7 +140,7 @@ impl FixedBuffer for FixedBuffer64 {
             if input.len() >= buffer_remaining {
                     copy_memory(
                         self.buffer.slice_mut(self.buffer_idx, size),
-                        &input[0..buffer_remaining]);
+                        &input[..buffer_remaining]);
                 self.buffer_idx = 0;
                 func(&self.buffer);
                 i += buffer_remaining;
@@ -188,7 +188,7 @@ impl FixedBuffer for FixedBuffer64 {
     fn full_buffer<'s>(&'s mut self) -> &'s [u8] {
         assert!(self.buffer_idx == 64);
         self.buffer_idx = 0;
-        return &self.buffer[0..64];
+        return &self.buffer[..64];
     }
 
     fn position(&self) -> uint { self.buffer_idx }

src/librustc_resolve/lib.rs

@@ -2081,7 +2081,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                                             // idx +- 1 to account for the
                                             // colons on either side
                                             &mpath[(idx + 1)..],
-                                            &mpath[0..(idx - 1)]);
+                                            &mpath[..(idx - 1)]);
                         return Failed(Some((span, msg)));
                     },
                     None => {

src/librustc_trans/back/lto.rs

@@ -186,7 +186,7 @@ pub fn run(sess: &session::Session, llmod: ModuleRef,
 fn is_versioned_bytecode_format(bc: &[u8]) -> bool {
     let magic_id_byte_count = link::RLIB_BYTECODE_OBJECT_MAGIC.len();
     return bc.len() > magic_id_byte_count &&
-           &bc[0..magic_id_byte_count] == link::RLIB_BYTECODE_OBJECT_MAGIC;
+           &bc[..magic_id_byte_count] == link::RLIB_BYTECODE_OBJECT_MAGIC;
 }
 
 fn extract_bytecode_format_version(bc: &[u8]) -> u32 {

src/librustc_trans/save/mod.rs

@@ -186,7 +186,7 @@ impl <'l, 'tcx> DxrVisitor<'l, 'tcx> {
         if len <= 2 {
             return;
         }
-        let sub_paths = &sub_paths[0..(len-2)];
+        let sub_paths = &sub_paths[..(len-2)];
         for &(ref span, ref qualname) in sub_paths.iter() {
             self.fmt.sub_mod_ref_str(path.span,
                                      *span,

src/librustc_trans/save/recorder.rs

@@ -166,7 +166,7 @@ impl<'a> FmtStrs<'a> {
         let values = values.iter().map(|s| {
             // Never take more than 1020 chars
             if s.len() > 1020 {
-                &s[0..1020]
+                &s[..1020]
             } else {
                 &s[]
             }

src/librustc_trans/trans/_match.rs

@@ -471,7 +471,7 @@ fn enter_default<'a, 'p, 'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
     // Collect all of the matches that can match against anything.
     enter_match(bcx, dm, m, col, val, |pats| {
         if pat_is_binding_or_wild(dm, &*pats[col]) {
-            let mut r = pats[0..col].to_vec();
+            let mut r = pats[..col].to_vec();
             r.push_all(&pats[(col + 1)..]);
             Some(r)
         } else {

src/librustc_trans/trans/builder.rs

@@ -552,7 +552,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             for (small_vec_e, &ix) in small_vec.iter_mut().zip(ixs.iter()) {
                 *small_vec_e = C_i32(self.ccx, ix as i32);
             }
-            self.inbounds_gep(base, &small_vec[0..ixs.len()])
+            self.inbounds_gep(base, &small_vec[..ixs.len()])
         } else {
             let v = ixs.iter().map(|i| C_i32(self.ccx, *i as i32)).collect::<Vec<ValueRef>>();
             self.count_insn("gepi");

src/librustc_trans/trans/debuginfo.rs

@@ -962,7 +962,7 @@ pub fn create_captured_var_metadata<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
 
     let variable_access = IndirectVariable {
         alloca: env_pointer,
-        address_operations: &address_operations[0..address_op_count]
+        address_operations: &address_operations[..address_op_count]
     };
 
     declare_local(bcx,

src/librustdoc/html/format.rs

@@ -332,7 +332,7 @@ fn path<F, G>(w: &mut fmt::Formatter,
         match rel_root {
             Some(root) => {
                 let mut root = String::from_str(root.as_slice());
-                for seg in path.segments[0..amt].iter() {
+                for seg in path.segments[..amt].iter() {
                     if "super" == seg.name ||
                             "self" == seg.name {
                         try!(write!(w, "{}::", seg.name));
@@ -347,7 +347,7 @@ fn path<F, G>(w: &mut fmt::Formatter,
                 }
             }
             None => {
-                for seg in path.segments[0..amt].iter() {
+                for seg in path.segments[..amt].iter() {
                     try!(write!(w, "{}::", seg.name));
                 }
             }