Trait "Hash" is not implemented for type "AssetId" error

Sway
1

Trait “Hash” is not implemented for type “AssetId” error

Hi guys, last week we finally released our swaylend on testnet beta 4, and today I sat down to fix a bug and found out that the contract is not building with an error that never happened before, I want to note that this code was building successfully last week and there were no errors (otherwise how would we release it?).

error
  --> /Users/alexey/projects/fuel/sway-lend/contracts/market/src/main.sw:41:79
   |
39 | 
40 | storage {
41 |     collateral_configurations: StorageMap<AssetId, CollateralConfiguration> = StorageMap {}, 
   |                                                                               ^^^^^^^^^^^^^ Trait "Hash" is not implemented for type "AssetId".
42 |     collateral_configurations_keys: StorageVec<AssetId> = StorageVec {},
43 |     pause_config: PauseConfiguration = PauseConfiguration::default(),
   |


error
   --> /Users/alexey/.forc/git/checkouts/std-9be0d6062747ea7/e75f14b03636bc96751a6760304a1a6d3eb5937d/sway-lib-std/src/hash.sw:322:41
    |
320 | 
321 | #![inline(never)]
322 | pub fn sha256<T>(s: T) -> b256 where T: Hash {
    |                                         ^^^^ Could not find symbol "Hash" in this scope.
323 |     let mut hasher = Hasher::new();
324 |     s.hash(hasher);
    |
____

error
   --> /Users/alexey/.forc/git/checkouts/std-9be0d6062747ea7/e75f14b03636bc96751a6760304a1a6d3eb5937d/sway-lib-std/src/hash.sw:322:41
    |
320 | 
321 | #![inline(never)]
322 | pub fn sha256<T>(s: T) -> b256 where T: Hash {
    |                                         ^^^^ Cannot find trait "Hash" in this scope.
323 |     let mut hasher = Hasher::new();
324 |     s.hash(hasher);
    |
____

Can you please help me figure out how to fix this?

Toolchain

Default host: aarch64-apple-darwin
fuelup home: /Users/alexey/.fuelup

installed toolchains
--------------------
beta-3-aarch64-apple-darwin
beta-4-rc.2-aarch64-apple-darwin
latest-aarch64-apple-darwin (default)
hotfix
my-custom-toolchain

active toolchain
-----------------
latest-aarch64-apple-darwin (default)
  forc : 0.46.0
    - forc-client
      - forc-deploy : 0.46.0
      - forc-run : 0.46.0
    - forc-doc : 0.46.0
    - forc-explore : 0.28.1
    - forc-fmt : 0.46.0
    - forc-index : 0.20.10
    - forc-lsp : 0.46.0
    - forc-tx : 0.46.0
    - forc-wallet : 0.3.0
  fuel-core : 0.20.5
  fuel-core-keygen : Error getting version string
  fuel-indexer : 0.20.10

fuels versions
---------------
forc : 0.45
forc-wallet : 0.45

How to reproduce

git clone https://github.com/compolabs/sway-lend.git
cd sway-lend    
git checkout beta-4   
cd contracts/market/
forc build
1 Like
2

Hey @fuel please refer to the breaking changes announcement!

In your main.sw simply add the import use std::hash::Hash;

You have an additional error for mismatched types which can be solved by adding AssetId::from(b256)

fn get_reward_token_asset_id() -> AssetId {
    AssetId::from(sha256((contract_id(), ZERO_B256)))
}
1 Like
3

Oh cool, thanks!!!
Even the lines are normal now, great!

1 Like
4

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