Fix PSUseDeclaredVarsMoreThanAssignments when variable is assigned more than once to still give a warning #836
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…re than once to still give a warning. Issue 833: PowerShell#833
…ags a variable that is assigned twice but still never used.
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To resolve Issue #833
Consider the case
$a=1;$a=2. Then theinAssignmentwill be false for the 2nd ast becausevarsInAssignmentalready contains unly assignments to unique variables. Therefore no warning was produced. This PR makes it output a warning correctly by trying to cast it to anAssignmentStatementAstan then checks the text to see if it is actually the same variable.