minor fixes on main file

src/main.zig

@@ -19,11 +19,10 @@ pub fn run(allocator: *std.mem.Allocator, slice: []const u8) !Result {
     // do a full scan pass, then reset, then do it again (with parser)
     while (true) {
         var tok_opt = scan.nextToken() catch |err| {
-            std.debug.warn(
-                "error at '{}': {}\n",
+            std.debug.warn("error at '{}': {}\n", .{
                 scan.currentLexeme(),
                 err,
-            );
+            });
 
             return Result.TokenizeError;
         };
@@ -76,7 +75,7 @@ pub fn main() anyerror!void {
 
     const filepath = try (args_it.next(allocator) orelse @panic("expected file path"));
 
-    var file = try std.fs.File.openRead(filepath);
+    var file = try std.fs.cwd().openFile(filepath, .{});
     defer file.close();
 
     const total_bytes = try file.getEndPos();