Allow char iter tests to run on rusts before 1.45

tests/chars.rs

@@ -1,29 +1,39 @@
 use rayon::prelude::*;
 use std::char;
-use std::collections::HashSet;
 
 #[test]
 fn half_open_correctness() {
-    let low = char::from_u32(0xD800 - 10).unwrap();
-    let high = char::from_u32(0xE000 + 10).unwrap();
+    let low = char::from_u32(0xD800 - 0x7).unwrap();
+    let high = char::from_u32(0xE000 + 0x7).unwrap();
 
     let range = low..high;
-
-    let std_iter: HashSet<char> = range.clone().collect();
-    let par_iter: HashSet<char> = range.into_par_iter().collect();
-
-    assert_eq!(std_iter, par_iter);
+    let mut chars: Vec<char> = range.into_par_iter().collect();
+    chars.sort();
+
+    assert_eq!(
+        chars,
+        vec![
+            '\u{D7F9}', '\u{D7FA}', '\u{D7FB}', '\u{D7FC}', '\u{D7FD}', '\u{D7FE}', '\u{D7FF}',
+            '\u{E000}', '\u{E001}', '\u{E002}', '\u{E003}', '\u{E004}', '\u{E005}', '\u{E006}',
+        ]
+    );
 }
 
 #[test]
 fn closed_correctness() {
-    let low = char::from_u32(0xD800 - 10).unwrap();
-    let high = char::from_u32(0xE000 + 10).unwrap();
+    let low = char::from_u32(0xD800 - 0x7).unwrap();
+    let high = char::from_u32(0xE000 + 0x7).unwrap();
 
     let range = low..=high;
-
-    let std_iter: HashSet<char> = range.clone().collect();
-    let par_iter: HashSet<char> = range.into_par_iter().collect();
-
-    assert_eq!(std_iter, par_iter);
+    let mut chars: Vec<char> = range.into_par_iter().collect();
+    chars.sort();
+
+    assert_eq!(
+        chars,
+        vec![
+            '\u{D7F9}', '\u{D7FA}', '\u{D7FB}', '\u{D7FC}', '\u{D7FD}', '\u{D7FE}', '\u{D7FF}',
+            '\u{E000}', '\u{E001}', '\u{E002}', '\u{E003}', '\u{E004}', '\u{E005}', '\u{E006}',
+            '\u{E007}',
+        ]
+    );
 }