1pub fn main() !void {
 2    var arena_state: std.heap.ArenaAllocator = .init(std.heap.page_allocator);
 3    defer arena_state.deinit();
 4    const arena = arena_state.allocator();
 5
 6    const args = try std.process.argsAlloc(arena);
 7    if (args.len != 3) return error.BadUsage; // usage: 'check_differ <path a> <path b>'
 8
 9    const contents_1 = try std.fs.cwd().readFileAlloc(args[1], arena, .limited(1024 * 1024 * 64)); // 64 MiB ought to be plenty
10    const contents_2 = try std.fs.cwd().readFileAlloc(args[2], arena, .limited(1024 * 1024 * 64)); // 64 MiB ought to be plenty
11
12    if (std.mem.eql(u8, contents_1, contents_2)) {
13        return error.FilesMatch;
14    }
15    // success, files differ
16}
17const std = @import("std");