IEx: Autocomplete breaks when called on variable that binds to non-atom. #5576
Description
Environment
- Elixir & Erlang versions (elixir -v):
$ iex --version
Erlang/OTP 19 [erts-8.0] [source] [64-bit] [smp:8:8] [async-threads:10] [kernel-poll:false]
IEx 1.4.0-rc.1 (16a14c1)
- Operating system:
Linux Mint 17.2 rafaela
Current behavior
Try the following code snippet in IEx:
iex(2)> defmodule Foo do
...(2)> defstruct [:a, :b, :c]
...(2)> end
{:module, Foo,
<<70, 79, 82, 49, 0, 0, 9, 28, 66, 69, 65, 77, 69, 120, 68, 99, 0, 0, 0, 186,
131, 104, 2, 100, 0, 14, 101, 108, 105, 120, 105, 114, 95, 100, 111, 99, 115,
95, 118, 49, 108, 0, 0, 0, 4, 104, 2, ...>>, %Foo{a: nil, b: nil, c: nil}}
iex(4)> x = %Foo{}
%Foo{a: nil, b: nil, c: nil}
iex(5)> x.*** ERROR: Shell process terminated! (^G to start new job) ***
09:31:24.596 [error] Process #PID<0.50.0> raised an exception
** (Protocol.UndefinedError) protocol Enumerable not implemented for %Foo{a: nil, b: nil, c: nil}
(elixir) lib/enum.ex:1: Enumerable.impl_for!/1
(elixir) lib/enum.ex:116: Enumerable.reduce/3
(elixir) lib/enum.ex:1767: Enum.reduce/3
(iex) lib/iex/autocomplete.ex:290: IEx.Autocomplete.match_map_fields/2
(iex) lib/iex/autocomplete.ex:137: IEx.Autocomplete.expand_map_field_access/2
(kernel) group.erl:568: :group.get_line1/4
(kernel) group.erl:462: :group.get_chars_loop/8
(kernel) group.erl:181: :group.io_request/5
(Note: At line (5) I typed x. and then pressed the TAB key to let IEx perform autocompletion.)
The shell is crashed by this, and does not seem to restart by itself, although you can still press Ctrl+C to bring up the BREAK menu.
Expected behavior
I would expect autocompletion to simply not work, i.e. not give any results.