dart_code does not accept code blocks

[uditrugman]

Describe the bug

codegen fails on the below:

#[frb(dart_code = "
    int testDartCode() {
        return 3;
    }
"
)]

this is the error:

Error: cannot parse string into token stream

Steps to reproduce

Hint: A simple way to reproduce is to clone and modify the https://github.com/fzyzcjy/flutter_rust_bridge/tree/master/frb_example/dart_minimal example package according to your needs.

1. ...
2. ...
3. ...

Logs

no logs needed. this is just a bug in the parser.
very easy to reproduce. just paste the above code in a rust project and it will fail to gen dart code

Expected behavior

No response

Generated binding code

No response

OS

No response

Version of flutter_rust_bridge_codegen

No response

Flutter info

No response

Version of clang++

No response

Additional context

No response

[fzyzcjy]

Good observation and feel free to PR for it! Alternative I will work on it later.

Btw, try to run with RUST_LOG=debug and paste the stack trace, and I guess this will be fairly easy to fix (thus good-first-issue).

[fzyzcjy]

(Reopen since that one is accidentally merged)

[fzyzcjy]

Current workaround before dtolnay/cargo-expand#227 is solved: Try to avoid having a single line with exact content }, which confuses cargo-expand output parser.

[github-actions]

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