Make struct InnerError public

[linw1995]

liquid-rust version: 0.26
rust version: 1.64.0
OS: Darwin 22.1.0

I've been trying to handle errors, and try to provide a user-friendly tip. For example, I need to get the requested variable from this error Error { inner: InnerError { msg: "Unknown variable", user_backtrace: [Trace { trace: None, context: [("requested variable", "num")] }], cause: None } }. But due to the InnerError being a private struct, there is nothing I can do then.

[epage]

Sorry for the delay, I was occupied with some family things.

Before discussing how we should support this, could you provide details of what all details you are interested in? And in what ways are you trying to provide tips?