Rollup merge of rust-lang#22876 - Florob:const, r=nikomatsakis

 This changes the type of some public constants/statics in libunicode.
Notably some `&'static &'static [(char, char)]` have changed
to `&'static [(char, char)]`. The regexp crate seems to be the
sole user of these, yet this is technically a [breaking-change]

Author: Manishearth

src/compiletest/runtest.rs

@@ -127,7 +127,7 @@ fn run_rfail_test(config: &Config, props: &TestProps, testfile: &Path) {
     };
 
     // The value our Makefile configures valgrind to return on failure
-    static VALGRIND_ERR: int = 100;
+    const VALGRIND_ERR: int = 100;
     if proc_res.status.matches_exit_status(VALGRIND_ERR) {
         fatal_proc_rec("run-fail test isn't valgrind-clean!", &proc_res);
     }
@@ -139,7 +139,7 @@ fn run_rfail_test(config: &Config, props: &TestProps, testfile: &Path) {
 
 fn check_correct_failure_status(proc_res: &ProcRes) {
     // The value the rust runtime returns on failure
-    static RUST_ERR: int = 101;
+    const RUST_ERR: int = 101;
     if !proc_res.status.matches_exit_status(RUST_ERR) {
         fatal_proc_rec(
             &format!("failure produced the wrong error: {:?}",

src/compiletest/util.rs

@@ -14,7 +14,7 @@ use common::Config;
 use std::env;
 
 /// Conversion table from triple OS name to Rust SYSNAME
-static OS_TABLE: &'static [(&'static str, &'static str)] = &[
+const OS_TABLE: &'static [(&'static str, &'static str)] = &[
     ("mingw32", "windows"),
     ("win32", "windows"),
     ("windows", "windows"),

src/etc/unicode.py

@@ -290,11 +290,11 @@ def emit_bsearch_range_table(f):
 fn bsearch_range_table(c: char, r: &'static [(char,char)]) -> bool {
     use core::cmp::Ordering::{Equal, Less, Greater};
     use core::slice::SliceExt;
-    r.binary_search(|&(lo,hi)| {
+    r.binary_search_by(|&(lo,hi)| {
         if lo <= c && c <= hi { Equal }
         else if hi < c { Less }
         else { Greater }
-    }).found().is_some()
+    }).is_ok()
 }\n
 """)
 
@@ -303,7 +303,7 @@ def emit_table(f, name, t_data, t_type = "&'static [(char, char)]", is_pub=True,
     pub_string = ""
     if is_pub:
         pub_string = "pub "
-    f.write("    %sstatic %s: %s = &[\n" % (pub_string, name, t_type))
+    f.write("    %sconst %s: %s = &[\n" % (pub_string, name, t_type))
     data = ""
     first = True
     for dat in t_data:
@@ -329,14 +329,14 @@ def emit_property_module(f, mod, tbl, emit_fn):
 def emit_regex_module(f, cats, w_data):
     f.write("pub mod regex {\n")
     regex_class = "&'static [(char, char)]"
-    class_table = "&'static [(&'static str, &'static %s)]" % regex_class
+    class_table = "&'static [(&'static str, %s)]" % regex_class
 
     emit_table(f, "UNICODE_CLASSES", cats, class_table,
-        pfun=lambda x: "(\"%s\",&super::%s::%s_table)" % (x[0], x[1], x[0]))
+        pfun=lambda x: "(\"%s\",super::%s::%s_table)" % (x[0], x[1], x[0]))
 
-    f.write("    pub static PERLD: &'static %s = &super::general_category::Nd_table;\n\n"
+    f.write("    pub const PERLD: %s = super::general_category::Nd_table;\n\n"
             % regex_class)
-    f.write("    pub static PERLS: &'static %s = &super::property::White_Space_table;\n\n"
+    f.write("    pub const PERLS: %s = super::property::White_Space_table;\n\n"
             % regex_class)
 
     emit_table(f, "PERLW", w_data, regex_class)
@@ -350,7 +350,7 @@ def emit_conversions_module(f, lowerupper, upperlower):
     use core::slice::SliceExt;
     use core::option::Option;
     use core::option::Option::{Some, None};
-    use core::slice;
+    use core::result::Result::{Ok, Err};
 
     pub fn to_lower(c: char) -> char {
         match bsearch_case_table(c, LuLl_table) {
@@ -367,13 +367,13 @@ def emit_conversions_module(f, lowerupper, upperlower):
     }
 
     fn bsearch_case_table(c: char, table: &'static [(char, char)]) -> Option<usize> {
-        match table.binary_search(|&(key, _)| {
+        match table.binary_search_by(|&(key, _)| {
             if c == key { Equal }
             else if key < c { Less }
             else { Greater }
         }) {
-            slice::BinarySearchResult::Found(i) => Some(i),
-            slice::BinarySearchResult::NotFound(_) => None,
+            Ok(i) => Some(i),
+            Err(_) => None,
         }
     }
 
@@ -386,10 +386,9 @@ def emit_conversions_module(f, lowerupper, upperlower):
 
 def emit_grapheme_module(f, grapheme_table, grapheme_cats):
     f.write("""pub mod grapheme {
-    use core::kinds::Copy;
     use core::slice::SliceExt;
     pub use self::GraphemeCat::*;
-    use core::slice;
+    use core::result::Result::{Ok, Err};
 
     #[allow(non_camel_case_types)]
     #[derive(Clone, Copy)]
@@ -401,16 +400,16 @@ def emit_grapheme_module(f, grapheme_table, grapheme_cats):
 
     fn bsearch_range_value_table(c: char, r: &'static [(char, char, GraphemeCat)]) -> GraphemeCat {
         use core::cmp::Ordering::{Equal, Less, Greater};
-        match r.binary_search(|&(lo, hi, _)| {
+        match r.binary_search_by(|&(lo, hi, _)| {
             if lo <= c && c <= hi { Equal }
             else if hi < c { Less }
             else { Greater }
         }) {
-            slice::BinarySearchResult::Found(idx) => {
+            Ok(idx) => {
                 let (_, _, cat) = r[idx];
                 cat
             }
-            slice::BinarySearchResult::NotFound(_) => GC_Any
+            Err(_) => GC_Any
         }
     }
 
@@ -430,20 +429,20 @@ def emit_charwidth_module(f, width_table):
     f.write("    use core::option::Option;\n")
     f.write("    use core::option::Option::{Some, None};\n")
     f.write("    use core::slice::SliceExt;\n")
-    f.write("    use core::slice;\n")
+    f.write("    use core::result::Result::{Ok, Err};\n")
     f.write("""
     fn bsearch_range_value_table(c: char, is_cjk: bool, r: &'static [(char, char, u8, u8)]) -> u8 {
         use core::cmp::Ordering::{Equal, Less, Greater};
-        match r.binary_search(|&(lo, hi, _, _)| {
+        match r.binary_search_by(|&(lo, hi, _, _)| {
             if lo <= c && c <= hi { Equal }
             else if hi < c { Less }
             else { Greater }
         }) {
-            slice::BinarySearchResult::Found(idx) => {
+            Ok(idx) => {
                 let (_, _, r_ncjk, r_cjk) = r[idx];
                 if is_cjk { r_cjk } else { r_ncjk }
             }
-            slice::BinarySearchResult::NotFound(_) => 1
+            Err(_) => 1
         }
     }
 """)
@@ -530,17 +529,17 @@ def comp_pfun(char):
     fn bsearch_range_value_table(c: char, r: &'static [(char, char, u8)]) -> u8 {
         use core::cmp::Ordering::{Equal, Less, Greater};
         use core::slice::SliceExt;
-        use core::slice;
-        match r.binary_search(|&(lo, hi, _)| {
+        use core::result::Result::{Ok, Err};
+        match r.binary_search_by(|&(lo, hi, _)| {
             if lo <= c && c <= hi { Equal }
             else if hi < c { Less }
             else { Greater }
         }) {
-            slice::BinarySearchResult::Found(idx) => {
+            Ok(idx) => {
                 let (_, _, result) = r[idx];
                 result
             }
-            slice::BinarySearchResult::NotFound(_) => 0
+            Err(_) => 0
         }
     }\n
 """)
@@ -609,7 +608,7 @@ def optimize_width_table(wtable):
             unicode_version = re.search(pattern, readme.read()).groups()
         rf.write("""
 /// The version of [Unicode](http://www.unicode.org/)
-/// that the `UnicodeChar` and `UnicodeStrPrelude` traits are based on.
+/// that the unicode parts of `CharExt` and `UnicodeStrPrelude` traits are based on.
 pub const UNICODE_VERSION: (u64, u64, u64) = (%s, %s, %s);
 """ % unicode_version)
         (canon_decomp, compat_decomp, gencats, combines,

src/libcollections/bit.rs

@@ -2544,7 +2544,7 @@ mod bit_vec_bench {
 
     use super::BitVec;
 
-    static BENCH_BITS : usize = 1 << 14;
+    const BENCH_BITS : usize = 1 << 14;
 
     fn rng() -> rand::IsaacRng {
         let seed: &[_] = &[1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
@@ -3039,7 +3039,7 @@ mod bit_set_bench {
 
     use super::{BitVec, BitSet};
 
-    static BENCH_BITS : usize = 1 << 14;
+    const BENCH_BITS : usize = 1 << 14;
 
     fn rng() -> rand::IsaacRng {
         let seed: &[_] = &[1, 2, 3, 4, 5, 6, 7, 8, 9, 0];

src/libcollections/slice.rs

@@ -1343,8 +1343,8 @@ fn insertion_sort<T, F>(v: &mut [T], mut compare: F) where F: FnMut(&T, &T) -> O
 
 fn merge_sort<T, F>(v: &mut [T], mut compare: F) where F: FnMut(&T, &T) -> Ordering {
     // warning: this wildly uses unsafe.
-    static BASE_INSERTION: usize = 32;
-    static LARGE_INSERTION: usize = 16;
+    const BASE_INSERTION: usize = 32;
+    const LARGE_INSERTION: usize = 16;
 
     // FIXME #12092: smaller insertion runs seems to make sorting
     // vectors of large elements a little faster on some platforms,

src/libcollections/string.rs

@@ -153,8 +153,8 @@ impl String {
             }
         }
 
-        static TAG_CONT_U8: u8 = 128u8;
-        static REPLACEMENT: &'static [u8] = b"\xEF\xBF\xBD"; // U+FFFD in UTF-8
+        const TAG_CONT_U8: u8 = 128u8;
+        const REPLACEMENT: &'static [u8] = b"\xEF\xBF\xBD"; // U+FFFD in UTF-8
         let total = v.len();
         fn unsafe_get(xs: &[u8], i: usize) -> u8 {
             unsafe { *xs.get_unchecked(i) }

src/libcollections/vec_deque.rs

@@ -39,8 +39,8 @@ use alloc::heap;
 #[unstable(feature = "collections")]
 pub use VecDeque as RingBuf;
 
-static INITIAL_CAPACITY: usize = 7; // 2^3 - 1
-static MINIMUM_CAPACITY: usize = 1; // 2 - 1
+const INITIAL_CAPACITY: usize = 7; // 2^3 - 1
+const MINIMUM_CAPACITY: usize = 1; // 2 - 1
 
 /// `VecDeque` is a growable ring buffer, which can be used as a
 /// double-ended queue efficiently.

src/libcore/fmt/float.rs

@@ -53,7 +53,7 @@ pub enum SignFormat {
     SignNeg
 }
 
-static DIGIT_E_RADIX: u32 = ('e' as u32) - ('a' as u32) + 11;
+const DIGIT_E_RADIX: u32 = ('e' as u32) - ('a' as u32) + 11;
 
 /// Converts a number to its string representation as a byte vector.
 /// This is meant to be a common base implementation for all numeric string

src/libcoretest/num/int_macros.rs

@@ -70,12 +70,12 @@ mod tests {
         assert!(-(0b11 as $T) - (1 as $T) == (0b11 as $T).not());
     }
 
-    static A: $T = 0b0101100;
-    static B: $T = 0b0100001;
-    static C: $T = 0b1111001;
+    const A: $T = 0b0101100;
+    const B: $T = 0b0100001;
+    const C: $T = 0b1111001;
 
-    static _0: $T = 0;
-    static _1: $T = !0;
+    const _0: $T = 0;
+    const _1: $T = !0;
 
     #[test]
     fn test_count_ones() {

src/libcoretest/num/uint_macros.rs

@@ -38,12 +38,12 @@ mod tests {
         assert!(MAX - (0b1011 as $T) == (0b1011 as $T).not());
     }
 
-    static A: $T = 0b0101100;
-    static B: $T = 0b0100001;
-    static C: $T = 0b1111001;
+    const A: $T = 0b0101100;
+    const B: $T = 0b0100001;
+    const C: $T = 0b1111001;
 
-    static _0: $T = 0;
-    static _1: $T = !0;
+    const _0: $T = 0;
+    const _1: $T = !0;
 
     #[test]
     fn test_count_ones() {

src/libflate/lib.rs

@@ -73,9 +73,9 @@ extern {
                                     -> *mut c_void;
 }
 
-static LZ_NORM : c_int = 0x80;  // LZ with 128 probes, "normal"
-static TINFL_FLAG_PARSE_ZLIB_HEADER : c_int = 0x1; // parse zlib header and adler32 checksum
-static TDEFL_WRITE_ZLIB_HEADER : c_int = 0x01000; // write zlib header and adler32 checksum
+const LZ_NORM: c_int = 0x80;  // LZ with 128 probes, "normal"
+const TINFL_FLAG_PARSE_ZLIB_HEADER: c_int = 0x1; // parse zlib header and adler32 checksum
+const TDEFL_WRITE_ZLIB_HEADER: c_int = 0x01000; // write zlib header and adler32 checksum
 
 fn deflate_bytes_internal(bytes: &[u8], flags: c_int) -> Option<Bytes> {
     unsafe {

src/librand/distributions/mod.rs

@@ -223,7 +223,7 @@ fn ziggurat<R: Rng, P, Z>(
             mut pdf: P,
             mut zero_case: Z)
             -> f64 where P: FnMut(f64) -> f64, Z: FnMut(&mut R, f64) -> f64 {
-    static SCALE: f64 = (1u64 << 53) as f64;
+    const SCALE: f64 = (1u64 << 53) as f64;
     loop {
         // reimplement the f64 generation as an optimisation suggested
         // by the Doornik paper: we have a lot of precision-space

src/librand/isaac.rs

@@ -127,7 +127,7 @@ impl IsaacRng {
         let mut a = self.a;
         let mut b = self.b + self.c;
 
-        static MIDPOINT: uint = (RAND_SIZE / 2) as uint;
+        const MIDPOINT: uint = (RAND_SIZE / 2) as uint;
 
         macro_rules! ind {
             ($x:expr) => ( self.mem[(($x >> 2) as uint & ((RAND_SIZE - 1) as uint))] )

src/librand/lib.rs

@@ -52,7 +52,7 @@ use distributions::{Range, IndependentSample};
 use distributions::range::SampleRange;
 
 #[cfg(test)]
-static RAND_BENCH_N: u64 = 100;
+const RAND_BENCH_N: u64 = 100;
 
 pub mod distributions;
 pub mod isaac;
@@ -342,7 +342,7 @@ impl<'a, R: Rng> Iterator for AsciiGenerator<'a, R> {
     type Item = char;
 
     fn next(&mut self) -> Option<char> {
-        static GEN_ASCII_STR_CHARSET: &'static [u8] =
+        const GEN_ASCII_STR_CHARSET: &'static [u8] =
             b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
               abcdefghijklmnopqrstuvwxyz\
               0123456789";

src/librand/rand_impls.rs

@@ -141,7 +141,7 @@ impl Rand for char {
     #[inline]
     fn rand<R: Rng>(rng: &mut R) -> char {
         // a char is 21 bits
-        static CHAR_MASK: u32 = 0x001f_ffff;
+        const CHAR_MASK: u32 = 0x001f_ffff;
         loop {
             // Rejection sampling. About 0.2% of numbers with at most
             // 21-bits are invalid codepoints (surrogates), so this

src/librand/reseeding.rs

@@ -18,7 +18,7 @@ use core::default::Default;
 
 /// How many bytes of entropy the underling RNG is allowed to generate
 /// before it is reseeded.
-static DEFAULT_GENERATION_THRESHOLD: uint = 32 * 1024;
+const DEFAULT_GENERATION_THRESHOLD: uint = 32 * 1024;
 
 /// A wrapper around any RNG which reseeds the underlying RNG after it
 /// has generated a certain number of random bytes.
@@ -212,7 +212,7 @@ mod test {
         assert_eq!(string1, string2);
     }
 
-    static FILL_BYTES_V_LEN: uint = 13579;
+    const FILL_BYTES_V_LEN: uint = 13579;
     #[test]
     fn test_rng_fill_bytes() {
         let mut v = repeat(0u8).take(FILL_BYTES_V_LEN).collect::<Vec<_>>();

src/librbml/io.rs

@@ -13,7 +13,7 @@ use std::old_io;
 use std::slice;
 use std::iter::repeat;
 
-static BUF_CAPACITY: uint = 128;
+const BUF_CAPACITY: uint = 128;
 
 fn combine(seek: SeekStyle, cur: uint, end: uint, offset: i64) -> IoResult<u64> {
     // compute offset as signed and clamp to prevent overflow

src/librustc/metadata/filesearch.rs

@@ -202,9 +202,9 @@ pub fn get_or_default_sysroot() -> Path {
 }
 
 #[cfg(windows)]
-static PATH_ENTRY_SEPARATOR: &'static str = ";";
+const PATH_ENTRY_SEPARATOR: char = ';';
 #[cfg(not(windows))]
-static PATH_ENTRY_SEPARATOR: &'static str = ":";
+const PATH_ENTRY_SEPARATOR: char = ':';
 
 /// Returns RUST_PATH as a string, without default paths added
 pub fn get_rust_path() -> Option<String> {

src/librustc/middle/liveness.rs

@@ -540,9 +540,9 @@ struct Specials {
     clean_exit_var: Variable
 }
 
-static ACC_READ: u32 = 1;
-static ACC_WRITE: u32 = 2;
-static ACC_USE: u32 = 4;
+const ACC_READ: u32 = 1;
+const ACC_WRITE: u32 = 2;
+const ACC_USE: u32 = 4;
 
 struct Liveness<'a, 'tcx: 'a> {
     ir: &'a mut IrMaps<'a, 'tcx>,