iex(16)> defmodule A do def _fib(n, %{ ^n => result }), do: result end**
(MatchError) no match of right hand side value: :error
Notice this is a compilation error.
Some background. This is part of a Fibonacci function that uses a cache
(the second parameter). If I get a cache hit, I want to return the
corresponding value.
The concept works outside the context of a function parameter list:
iex(16)> cache = %{ 0 => 0, 10 => 55 }%{0 => 0, 10 => 55}
iex(17)> n = 10; %{ ^n => result } = cache; result55
Elixir 1.5.0-dev (3094471)
If it's a bug, I'll submit it.
Cheers
Dave
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