public void AddVariable(IdentifierToken variableToken, IdentifierToken typeToken, SymVar.SymLocTypeEnum locType,
SymConst value = null)
{
var type = FindType(typeToken.Value);
if (type == null)
{
throw new TypeNotFoundException(typeToken.Lexeme, typeToken.Line, typeToken.Column);
}
RequireSymbolRewritable(variableToken);
//type check for initial value must be performed earlier. i.e. in parser.
var symVar = new SymVar(variableToken.Value, type, value, locType);
_stack.Peek().Add(symVar);
}