have line/char available in AST?

[jlmgtech]

Not a bug, more of a feature. I wasn't sure where to ask. I'm writing an interpreter for SQL and I'd like to tell the user exactly where they made a semantic error. I was going to use sqlify() to render the branch of the tree the problem occurred on, but sqlify only accepts top-level ast nodes (for instance, I can't sqlify a column_ref). Is there something I can use to visually show the user where their error was made (perhaps line numbers somewhere or an offset, or maybe another sqlify function?).

Thank you.