--- in2.zig	2020-01-28 21:57:31.964205087 -0500
+++ test2.zig	2020-01-28 22:24:10.761897754 -0500
@@ -33,22 +33,29 @@
     };
 }
 
+pub const io_mode = .evented;
+
 pub fn main() !void {
     const allocator = &std.heap.ArenaAllocator.init(std.heap.page_allocator).allocator;
     const args = try std.process.argsAlloc(allocator);
     const cwd = std.fs.cwd();
 
+    var list = std.ArrayList(anyframe->anyerror!void).init(allocator);
     for (args[1..]) |arg| {
         const file = cwd.openFile(arg, .{}) catch |err| {
             std.debug.warn("Unable to open file: {}\n", .{@errorName(err)});
             return err;
         };
-        defer file.close();
-        try wc_file(file);
+        const frame = try allocator.create(@Frame(wc_file));
+        frame.* = async wc_file(file);
+        try list.append(frame);
+    }
+    for (list.toSlice()) |frame| {
+        try await frame;
     }
 }
 
-fn wc_file(file: std.fs.File) !void {
+fn wc_file(file: std.fs.File) anyerror!void {
     var file_unbuf = file.inStream();
     const in = &std.io.BufferedInStream(@TypeOf(file_unbuf).Error).init(&file_unbuf.stream).stream;
     var o = Output{