update to 2018 edition

- Brings MSRV support up to 1.31.
- Removes the build.rs file.

.github/workflows/CI.yml

@@ -76,7 +76,7 @@ jobs:
       - name: Install Rust MSRV
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.3.0
+          toolchain: 1.36.0
 
       - name: Check
         run: cargo build

Cargo.toml

@@ -10,15 +10,11 @@ license = "MIT OR Apache-2.0"
 readme = "README.md"
 keywords = ["lowercase", "case", "case-insensitive", "case-folding", "no_std"]
 categories = ["internationalization", "text-processing", "no-std"]
+edition = "2018"
 
 exclude = [
     "scripts/*"
 ]
 
-build = "build.rs"
-
-[build-dependencies]
-version_check = "0.9"
-
 [features]
 nightly = []

src/ascii.rs

@@ -1,42 +1,27 @@
 use alloc::string::String;
-#[cfg(__unicase__iter_cmp)]
 use core::cmp::Ordering;
 use core::fmt;
 use core::hash::{Hash, Hasher};
 use core::ops::{Deref, DerefMut};
 use core::str::FromStr;
-#[cfg(not(__unicase__core_and_alloc))]
-#[allow(deprecated, unused)]
-use std::ascii::AsciiExt;
 
 use super::{Ascii, Encoding, UniCase};
 
 impl<S> Ascii<S> {
-    #[inline]
-    #[cfg(__unicase__const_fns)]
-    pub const fn new(s: S) -> Ascii<S> {
-        Ascii(s)
-    }
-
     /// Construct a new `Ascii`.
     ///
     /// For Rust versions >= 1.31, this is a `const fn`.
     #[inline]
-    #[cfg(not(__unicase__const_fns))]
-    pub fn new(s: S) -> Ascii<S> {
+    pub const fn new(s: S) -> Ascii<S> {
         Ascii(s)
     }
 
-    #[cfg(__unicase_const_fns)]
+    /// Convert this into a [`UniCase`].
     pub const fn into_unicase(self) -> UniCase<S> {
         UniCase(Encoding::Ascii(self))
     }
 
-    #[cfg(not(__unicase_const_fns))]
-    pub fn into_unicase(self) -> UniCase<S> {
-        UniCase(Encoding::Ascii(self))
-    }
-
+    /// Consume this `Ascii` and get the inner value.
     #[inline]
     pub fn into_inner(self) -> S {
         self.0
@@ -58,15 +43,13 @@ impl<S> DerefMut for Ascii<S> {
     }
 }
 
-#[cfg(__unicase__iter_cmp)]
 impl<T: AsRef<str>> PartialOrd for Ascii<T> {
     #[inline]
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
         Some(self.cmp(other))
     }
 }
 
-#[cfg(__unicase__iter_cmp)]
 impl<T: AsRef<str>> Ord for Ascii<T> {
     #[inline]
     fn cmp(&self, other: &Self) -> Ordering {
@@ -131,12 +114,10 @@ impl<S: AsRef<str>> Hash for Ascii<S> {
 
 #[cfg(test)]
 mod tests {
-    #[cfg(__unicase__default_hasher)]
+    use super::Ascii;
     use std::collections::hash_map::DefaultHasher;
-    #[cfg(not(__unicase__default_hasher))]
-    use std::hash::SipHasher as DefaultHasher;
     use std::hash::{Hash, Hasher};
-    use Ascii;
+    use std::string::String;
 
     fn hash<T: Hash>(t: &T) -> u64 {
         let mut s = DefaultHasher::new();
@@ -165,7 +146,6 @@ mod tests {
         b.iter(|| assert_eq!(Ascii("foobar"), Ascii("FOOBAR")));
     }
 
-    #[cfg(__unicase__iter_cmp)]
     #[test]
     fn test_case_cmp() {
         assert!(Ascii("foobar") == Ascii("FOOBAR"));
@@ -178,7 +158,6 @@ mod tests {
         assert!(Ascii("a") < Ascii("AA"));
     }
 
-    #[cfg(__unicase__const_fns)]
     #[test]
     fn test_ascii_new_const() {
         const _ASCII: Ascii<&'static str> = Ascii::new("");

src/lib.rs

@@ -1,8 +1,7 @@
 #![cfg_attr(test, deny(missing_docs))]
 #![cfg_attr(test, deny(warnings))]
-#![doc(html_root_url = "https://docs.rs/unicase/2.7.0")]
 #![cfg_attr(feature = "nightly", feature(test))]
-#![cfg_attr(all(__unicase__core_and_alloc, not(test),), no_std)]
+#![no_std]
 
 //! # UniCase
 //!
@@ -43,21 +42,15 @@
 //! assert_eq!(a, b);
 //! ```
 
+#[cfg(test)]
+extern crate std;
 #[cfg(feature = "nightly")]
 extern crate test;
 
-#[cfg(all(__unicase__core_and_alloc, not(test)))]
 extern crate alloc;
-#[cfg(all(__unicase__core_and_alloc, not(test)))]
 use alloc::string::String;
 
-#[cfg(not(all(__unicase__core_and_alloc, not(test))))]
-extern crate std as alloc;
-#[cfg(not(all(__unicase__core_and_alloc, not(test))))]
-extern crate std as core;
-
 use alloc::borrow::Cow;
-#[cfg(__unicase__iter_cmp)]
 use core::cmp::Ordering;
 use core::fmt;
 use core::hash::{Hash, Hasher};
@@ -128,10 +121,6 @@ impl<S: AsRef<str>> UniCase<S> {
     ///
     /// Note: This scans the text to determine if it is all ASCII or not.
     pub fn new(s: S) -> UniCase<S> {
-        #[cfg(not(__unicase__core_and_alloc))]
-        #[allow(deprecated, unused)]
-        use std::ascii::AsciiExt;
-
         if s.as_ref().is_ascii() {
             UniCase(Encoding::Ascii(Ascii(s)))
         } else {
@@ -147,10 +136,6 @@ impl<S: AsRef<str>> UniCase<S> {
     /// Unicode Case Folding is meant for string storage and matching, not for
     /// display.
     pub fn to_folded_case(&self) -> String {
-        #[cfg(not(__unicase__core_and_alloc))]
-        #[allow(deprecated, unused)]
-        use std::ascii::AsciiExt;
-
         match self.0 {
             Encoding::Ascii(ref s) => s.0.as_ref().to_ascii_lowercase(),
             Encoding::Unicode(ref s) => s.to_folded_case(),
@@ -160,33 +145,15 @@ impl<S: AsRef<str>> UniCase<S> {
 
 impl<S> UniCase<S> {
     /// Creates a new `UniCase`, skipping the ASCII check.
-    #[cfg(__unicase__const_fns)]
     pub const fn unicode(s: S) -> UniCase<S> {
         UniCase(Encoding::Unicode(Unicode(s)))
     }
 
-    /// Creates a new `UniCase`, skipping the ASCII check.
-    ///
-    /// For Rust versions >= 1.31, this is a `const fn`.
-    #[cfg(not(__unicase__const_fns))]
-    pub fn unicode(s: S) -> UniCase<S> {
-        UniCase(Encoding::Unicode(Unicode(s)))
-    }
-
     /// Creates a new `UniCase` which performs only ASCII case folding.
-    #[cfg(__unicase__const_fns)]
     pub const fn ascii(s: S) -> UniCase<S> {
         UniCase(Encoding::Ascii(Ascii(s)))
     }
 
-    /// Creates a new `UniCase` which performs only ASCII case folding.
-    ///
-    /// For Rust versions >= 1.31, this is a `const fn`.
-    #[cfg(not(__unicase__const_fns))]
-    pub fn ascii(s: S) -> UniCase<S> {
-        UniCase(Encoding::Ascii(Ascii(s)))
-    }
-
     /// Return `true` if this instance will only perform ASCII case folding.
     pub fn is_ascii(&self) -> bool {
         match self.0 {
@@ -308,15 +275,13 @@ into_impl!(&'a str);
 into_impl!(String);
 into_impl!(Cow<'a, str>);
 
-#[cfg(__unicase__iter_cmp)]
 impl<T: AsRef<str>> PartialOrd for UniCase<T> {
     #[inline]
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
         Some(self.cmp(other))
     }
 }
 
-#[cfg(__unicase__iter_cmp)]
 impl<T: AsRef<str>> Ord for UniCase<T> {
     #[inline]
     fn cmp(&self, other: &Self) -> Ordering {
@@ -343,11 +308,10 @@ impl<S: FromStr + AsRef<str>> FromStr for UniCase<S> {
 #[cfg(test)]
 mod tests {
     use super::UniCase;
-    #[cfg(__unicase__default_hasher)]
+    use std::borrow::ToOwned;
     use std::collections::hash_map::DefaultHasher;
-    #[cfg(not(__unicase__default_hasher))]
-    use std::hash::SipHasher as DefaultHasher;
     use std::hash::{Hash, Hasher};
+    use std::string::String;
 
     fn hash<T: Hash>(t: &T) -> u64 {
         let mut s = DefaultHasher::new();
@@ -432,7 +396,6 @@ mod tests {
         b.iter(|| assert!(::std::str::from_utf8(SUBJECT).is_ok()));
     }
 
-    #[cfg(__unicase__iter_cmp)]
     #[test]
     fn test_case_cmp() {
         assert!(UniCase::new("a") < UniCase::new("B"));
@@ -467,7 +430,6 @@ mod tests {
         let _: &str = owned.as_ref();
     }
 
-    #[cfg(__unicase__const_fns)]
     #[test]
     fn test_unicase_unicode_const() {
         const _UNICASE: UniCase<&'static str> = UniCase::unicode("");

src/unicode/map.rs

@@ -412,6 +412,8 @@ pub fn lookup(orig: char) -> Fold {
 
 #[test]
 fn lookup_consistency() {
+    use std::vec::Vec;
+
     fn lookup_naive(orig: char) -> Fold {
         let single_char = match orig as u32 {
             0x0041 => 0x0061,

src/unicode/mod.rs

@@ -1,6 +1,4 @@
-#[cfg(all(__unicase__core_and_alloc, not(test)))]
 use alloc::string::String;
-#[cfg(__unicase__iter_cmp)]
 use core::cmp::Ordering;
 use core::hash::{Hash, Hasher};
 
@@ -43,15 +41,13 @@ impl<S1: AsRef<str>, S2: AsRef<str>> PartialEq<Unicode<S2>> for Unicode<S1> {
 
 impl<S: AsRef<str>> Eq for Unicode<S> {}
 
-#[cfg(__unicase__iter_cmp)]
 impl<T: AsRef<str>> PartialOrd for Unicode<T> {
     #[inline]
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
         Some(self.cmp(other))
     }
 }
 
-#[cfg(__unicase__iter_cmp)]
 impl<T: AsRef<str>> Ord for Unicode<T> {
     #[inline]
     fn cmp(&self, other: &Self) -> Ordering {