Title: Conflict with an inherited variable
Goal: Rename the variable `Z' to `A' in the body of the fun expression.
Parameters: [{file,"var5.erl"},{position,38},{varname,"A"}].
Documentation: Variable with name `A' is an existing variable bound in the
 pattern of the function. Variable `Z' is bound inside an embedded scope, but
 the name `A' is visible in this scope, which would conflict with the new name
 of `Z'.

