Variable binding in anonymous function's pattern matching

[X4lldux]

Hi,

why does this works:
iex(33)> x=1234; [c: 12345, b: 1234, a: 123] |>  Enum.filter(fn z -> case z do {key, ^x} -> IO.inspect key; {key, _} -> IO.inspect key; false end end)
:c
:b
:a
[b: 1234]

but this fails with an error:
iex(34)> x=1234; [c: 12345, b: 1234, a: 123] |>  Enum.filter(fn {key, ^x} -> IO.inspect key; {key, _} -> IO.inspect key; false end)
** (CompileError) iex:34: unbound variable ^x
    (stdlib) lists.erl:1352: :lists.mapfoldl/3
    (stdlib) lists.erl:1353: :lists.mapfoldl/3
    (elixir) src/elixir_translator.erl:297: :elixir_translator.translate/2
    (stdlib) lists.erl:1352: :lists.mapfoldl/3
    (elixir) src/elixir_fn.erl:26: :elixir_fn.translate_fn_match/2
    (elixir) src/elixir_clauses.erl:26: :elixir_clauses.match/3
    (elixir) src/elixir_clauses.erl:35: :elixir_clauses.clause/7


Regards,
X4lldux

[Peter Hamilton]

Known issue. https://github.com/elixir-lang/elixir/issues/2061

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[X4lldux]

Thanks!