Elixir scoping changes

scoping.ex

leak1.ex:
defmodule Leak1 do
  def leak do
    x = 0
    if true do
      x = 1
    end
    x
  end
end
IO.puts(Leak1.leak)


leak2.ex:
defmodule Leak2 do
  def leak do
    if true do
      x = 1
    end
    x
  end
end
IO.puts(Leak2.leak)




Commit 212bfae (https://github.com/elixir-lang/elixir/commit/212bfae):

% ./bin/elixir leak1.ex
warning: the variable "x" is unsafe as it has been set inside one of: case, cond, receive, if, and, or, &&, ||. Please explicitly return the variable value instead. For example:

    case integer do
      1 -> atom = :one
      2 -> atom = :two
    end

should be written as

    atom =
      case integer do
        1 -> :one
        2 -> :two
      end

Unsafe variable found at:
  leak1.ex:7

1

% ./bin/elixir leak2.ex
warning: the variable "x" is unsafe as it has been set inside one of: case, cond, receive, if, and, or, &&, ||. Please explicitly return the variable value instead. For example:

    case integer do
      1 -> atom = :one
      2 -> atom = :two
    end

should be written as

    atom =
      case integer do
        1 -> :one
        2 -> :two
      end

Unsafe variable found at:
  leak2.ex:6

1




Commit 113d2c6 (https://github.com/elixir-lang/elixir/commit/113d2c6):

% ./bin/elixir leak1.ex
warning: the variable "x" is unsafe as it has been set inside one of: case, cond, receive, if, and, or, &&, ||. Please explicitly return the variable value instead. For example:

    case integer do
      1 -> atom = :one
      2 -> atom = :two
    end

should be written as

    atom =
      case integer do
        1 -> :one
        2 -> :two
      end

Unsafe variable found at:
  leak1.ex:7

1

% ./bin/elixir leak2.ex
warning: variable "x" does not exist and is being expanded to "x()", please use parentheses to remove the ambiguity or change the variable name
  leak2.ex:6

warning: variable "x" is unused
  leak2.ex:4

** (CompileError) leak2.ex:6: undefined function x/0
    (stdlib) lists.erl:1338: :lists.foreach/2
    leak2.ex:1: (file)




Commit 1ba04d1 (https://github.com/elixir-lang/elixir/commit/1ba04d1):

% ./bin/elixir leak1.ex
warning: variable "x" is unused
  leak1.ex:5

0

% ./bin/elixir leak2.ex
warning: variable "x" does not exist and is being expanded to "x()", please use parentheses to remove the ambiguity or change the variable name
  leak2.ex:6

warning: variable "x" is unused
  leak2.ex:4

** (CompileError) leak2.ex:6: undefined function x/0
    (stdlib) lists.erl:1338: :lists.foreach/2
    leak2.ex:1: (file)