public static boolean isVoidDataType(DataType dt) {
		if (dt == null) {
			return false;
		}
		if (dt instanceof TypeDef t) {
			dt = t.getBaseDataType();
		}
		return dt instanceof VoidDataType;
	}
Determine if the specified {@link DataType} is a {@link VoidDataType} after 
stripping away any {@link TypeDef}.
@param dt datatype to be tested
@return true if dt is a void type
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/VoidDataType.java