/// <summary>
/// Gets the declared symbol and root operation from the passed in declarationSyntax and calls
/// <see cref="IsSymbolAssignedPossiblyNullValue(SemanticModel, IOperation, ISymbol)"/>. Note
/// that this is bool and not bool? because we know that the symbol is at the very least declared,
/// so there's no need to return a null value.
/// </summary>
public static bool IsDeclaredSymbolAssignedPossiblyNullValue(SemanticModel semanticModel, SyntaxNode declarationSyntax, CancellationToken cancellationToken)
{
var declaredSymbol = semanticModel.GetRequiredDeclaredSymbol(declarationSyntax, cancellationToken);
var declaredOperation = semanticModel.GetRequiredOperation(declarationSyntax, cancellationToken);
var rootOperation = declaredOperation;
// Walk up the tree to find a root for the operation
// that contains the declaration
while (rootOperation is not IBlockOperation &&
rootOperation.Parent is not null)
{
rootOperation = rootOperation.Parent;
}
return(IsSymbolAssignedPossiblyNullValue(semanticModel, rootOperation, declaredSymbol) == true);
}