message: Since Rust 1.32, the system allocator is the default
diff: @@ -3,7 +3,6 @@ use ion_shell::{BuiltinMap, IonError, PipelineError, Shell, Value};
  use ion_sys as sys;
  use liner::KeyBindings;
  use std::{
  - alloc::System,
  io::{self, stdin, BufReader},
  process,
  };
  @@ -19,9 +18,6 @@ use structopt::StructOpt;
  mod binary;
  -#[global_allocator]
  -static A: System = System;
  -
  struct KeyBindingsWrapper(KeyBindings);
  #[cfg(feature = "advanced_arg_parsing")]
  