feat: add Zig syntax highlighting

src/syntax.rs

@@ -1658,6 +1658,43 @@ mod tests {
         );
     }
 
+    #[test]
+    fn zig_highlights_literals_builtins_and_predicate_matched_identifiers() {
+        let source = r#"const std = @import("std");
+const MAX_COUNT: u32 = 42;
+pub fn main() void {
+    const local = @as(u32, 7);
+    const value = Point;
+    const text =
+        \\first é
+        \\second
+    ;
+    // note
+}"#;
+        let cache = self::cache(source, "main.zig");
+        for (row, token, kind) in [
+            (0, "const", SyntaxKind::Keyword),
+            (0, "@import", SyntaxKind::Keyword),
+            (0, "\"std\"", SyntaxKind::String),
+            (1, "MAX_COUNT", SyntaxKind::Keyword),
+            (1, "u32", SyntaxKind::Type),
+            (1, "42", SyntaxKind::Number),
+            (2, "pub", SyntaxKind::Keyword),
+            (2, "fn", SyntaxKind::Keyword),
+            (2, "main", SyntaxKind::Function),
+            (2, "void", SyntaxKind::Type),
+            (3, "@as", SyntaxKind::Function),
+            (4, "Point", SyntaxKind::Type),
+            (6, "first é", SyntaxKind::String),
+            (7, "second", SyntaxKind::String),
+            (9, "note", SyntaxKind::Comment),
+        ] {
+            assert_token(&cache, source, row, token, kind);
+        }
+        let local = source.lines().nth(3).unwrap().find("local").unwrap();
+        assert_eq!(kind_at(&cache, 3, local), None);
+    }
+
     #[test]
     fn filenames_shebang_save_as_and_tsx_use_actual_grammar_identity() {
         let source = lines("\u{feff}#!/usr/bin/env python3\nreturn 42");