Use hex literal for INDEX_MASK

Author: martingms

library/core/src/unicode/unicode_data.rs

@@ -580,7 +580,7 @@ pub mod white_space {
 
 #[rustfmt::skip]
 pub mod conversions {
-    const INDEX_MASK: u32 = 4194304;
+    const INDEX_MASK: u32 = 0x400000;
 
     pub fn to_lower(c: char) -> [char; 3] {
         if c.is_ascii() {

src/tools/unicode-table-generator/src/case_mapping.rs

@@ -10,7 +10,7 @@ const INDEX_MASK: u32 = 1 << 22;
 pub(crate) fn generate_case_mapping(data: &UnicodeData) -> String {
     let mut file = String::new();
 
-    write!(file, "const INDEX_MASK: u32 = {};", INDEX_MASK).unwrap();
+    write!(file, "const INDEX_MASK: u32 = 0x{:x};", INDEX_MASK).unwrap();
     file.push_str("\n\n");
     file.push_str(HEADER.trim_start());
     file.push('\n');