Update CHANGELOG and error messages

Author: José Valim

CHANGELOG.md

@@ -1,14 +1,22 @@
 # v0.12.1-dev
 
 * Enhancements
+  * [ExUnit] Support `:include` and `:exclude` configuration options to filter which tests should run based on their tags. Those options are also supported via `mix test` as `--include` and `--exclude`
+  * [ExUnit] Allow doctests to match against `#MyModule<>`
 
 * Bug fixes
+  * [CLI] Abort when a pattern given to elixirc does not match any file
+  * [Float] Fix `Float.parse/1` to handle numbers of the form "-0.x"
+  * [IEx] Improve error message for `IEx.Helpers.r` when module does not exist
+  * [Mix] Ensure `deps.get` updates origin if lock origin and dep origin do not match
   * [Typespec] Fix conversion of unary ops from typespec format to ast
 
 * Deprecations
   * [Kernel] Do not leak clause heads. Previously, a variable defined in a case/receive head clauses would leak to the outer scope. This behaviour is deprecated and will be removed in the next release.
 
 * Backwards incompatible changes
+  * [GenFSM] GenServer now stops on unknown event/sync_event requests
+  * [GenServer] GenServer now stops on unknown call/cast requests
   * [Kernel] Change how `->` is represented in AST. Now each clause is represented by its own AST node which makes composition easier. See commit 51aef55 for more information.
 
 # v0.12.0 (2013-12-15)

lib/iex/lib/iex/helpers.ex

@@ -69,13 +69,13 @@ defmodule IEx.Helpers do
       raise ArgumentError, message: "expected a binary or a list of binaries as argument"
     end
 
-    { found, not_found } = Enum.map(files, &Path.expand(&1, path)) |> Enum.partition(&File.exists?/1)
+    { found, not_found } =
+      files
+      |> Enum.map(&Path.expand(&1, path))
+      |> Enum.partition(&File.exists?/1)
 
     unless Enum.empty?(not_found) do
-      IO.puts IEx.color(:eval_error, %s[Cannot find #{Enum.join(not_found, ", ")}])
-      unless Enum.empty?(found) do
-        IO.puts IEx.color(:eval_info, "(remaining file(s) will be compiled)")
-      end
+      raise ArgumentError, message: "could not find files #{Enum.join(not_found, ", ")}"
     end
 
     { erls, exs } = Enum.partition(found, &String.ends_with?(&1, ".erl"))
@@ -315,7 +315,10 @@ defmodule IEx.Helpers do
     source = source(module)
     cond do
       source == nil ->
-        :nosource
+        raise ArgumentError, message: "could not find source for module: #{inspect module}"
+
+      not File.exists?(source) ->
+        raise ArgumentError, message: "could not find source (#{source}) for module: #{inspect module}"
 
       String.ends_with?(source, ".erl") ->
         [compile_erlang(source) |> elem(0)]