private IEnumerable<IAnalysisVariable> GetVariablesInScope(Lookup name, EnvironmentRecord scope) {
var result = new List<IAnalysisVariable>();
VariableDef var;
if (scope.TryGetVariable(name.Name, out var)) {
result.AddRange(VariableTransformer.ScopeToVariables.ToVariables(_unit, var));
}
// if a variable is imported from another module then also yield the defs/refs for the
// value in the defining module.
var linked = scope.GetLinkedVariablesNoCreate(name.Name);
if (linked != null) {
result.AddRange(linked.SelectMany(x => VariableTransformer.ScopeToVariables.ToVariables(_unit, x)));
}
return result;
}