Deserialization error on contract call after rust update

[alexvelicu]

We have integrated a near contract in our development.

When we compile / build / test / deploy the contract with
cargo 1.66.1 (ad779e08b 2023-01-10)
rustup 1.25.1 (bb60b1e89 2022-07-12)
We can call the contract, execute view, no errors.

After updating to rustup 1.26.0 (5af9b9484 2023-04-05)
Contract call returns Querying [object Object] failed: wasm execution failed with error: CompilationError(PrepareError(Deserialization))
Also on call to set values we get a receipt with

"status": {
            "Failure": {
              "ActionError": {
                "index": 0,
                "kind": {
                  "FunctionCallError": {
                    "CompilationError": {
                      "PrepareError": "Deserialization"
                    }
                  }
                }
              }
            }
          }

This can be reproduced on
https://github.com/near-examples/hello-near-rust/tree/main/contract
Any suggestions?

[agostbiro]

Hi @alexvelicu, thanks for reporting this!

The error is an unfortunate consequence of nearcore not yet supporting Rust 1.70. You can work around this limitation by using Rust 1.69. If you're using rustup, you can accomplish this automatically by placing a file called rust-toolchain.toml next to your Cargo.toml (or workspace root) with the following content:

[toolchain]
channel = "1.69"

I'll submit a PR in hello-near-rust to add this file.

[agostbiro]

Closing this as fixed as PR was merged to hello-near-rust near-examples/hello-near-examples#6