void CheckVariable (IVariable variable, Statement env)
{
if (!issueProvider.IsTargetVariable (variable))
return;
var root = new Environment (env, env);
var envLookup = new Dictionary<AstNode, Environment> ();
envLookup [env] = root;
FindLocalReferences (variable, (astNode, resolveResult) =>
AddNode (envLookup, new Node (astNode, issueProvider.GetNodeKind (astNode))));
root.SortChildren ();
CollectIssues (root, variable.Name);
}