in.zig

const std = @import("std");

pub fn main() !void {
    var arena_impl = std.heap.ArenaAllocator.init(std.heap.page_allocator);
    const arena = &arena_impl.allocator;
    defer arena_impl.deinit();

    var buf = try std.Buffer.init(arena, "");
    var in_impl = std.io.getStdIn().inStream();
    var in = &in_impl.stream;
    const bytes = try std.io.readLineFrom(in, &buf);
    std.debug.warn("read: {}\n", .{bytes});
}