--- in1.zig	2020-01-28 21:55:22.150067648 -0500
+++ test2.zig	2020-01-28 21:53:58.576979169 -0500
@@ -19,12 +19,12 @@
     };
 }
 
-fn toLine(l: []u8) Line {
+fn toLine(l: []const u8) Line {
     var ti: std.mem.TokenIterator = std.mem.tokenize(l, " ");
     var count: usize = 0;
 
-    while (ti.next()) |slice_or_err| {
-        count = count + 1;
+    while (ti.next()) |_| {
+        count += 1;
     }
 
     return Line{
@@ -34,15 +34,11 @@
 }
 
 pub fn main() !void {
-    const allocator = std.debug.global_allocator;
-    var args_it = std.process.args();
-    _ = try unwrapArg(args_it.next(allocator).?);
-
+    const allocator = &std.heap.ArenaAllocator.init(std.heap.page_allocator).allocator;
+    const args = try std.process.argsAlloc(allocator);
     const cwd = std.fs.cwd();
 
-    while (args_it.next(allocator)) |arg_or_err| {
-        const arg = try unwrapArg(arg_or_err);
-
+    for (args[1..]) |arg| {
         const file = cwd.openFile(arg, .{}) catch |err| {
             std.debug.warn("Unable to open file: {}\n", .{@errorName(err)});
             return err;
@@ -69,10 +65,3 @@
 
     std.debug.warn("{}\n", .{o});
 }
-
-fn unwrapArg(arg: anyerror![]u8) ![]u8 {
-    return arg catch |err| {
-        std.debug.warn("Unable to parse command line: {}\n", .{err});
-        return err;
-    };
-}