Variable resolution: shadowing

[deadok22]

In following code Var from fun expression's pattern is not a reference to outer scope's Var - it is a new variable and it shadows the outer Var inside fun expression

f() ->
  Var = 1,
  fun (Var) -> Var * 2 end.

The plugin resolves fun's argument to Var from outer scope, which is wrong.

[deadok22]

relates to #198