Compilation error following the sample counter contract using forc build?

Sway
3

Hello @calldelegation, thank you.

  1. Here’s the compilation error it shows using forc build in the root directory of my Sway project:
sheys@DESKTOP-MRD72SV:~/fuelvm-projects/counter$ forc build
 Compiling library core (/home/sheys/.forc/git/checkouts/std-9be0d6062747ea7/512a3386f8961185188302f391ccc96553d23a7a/sway-lib-core)
 Compiling library std (git+https://github.com/fuellabs/sway?tag=v0.46.1#512a3386f8961185188302f391ccc96553d23a7a)
 Compiling contract counter (/home/sheys/fuelvm-projects/counter)
warning
 --> /home/sheys/fuelvm-projects/counter/src/main.sw:5:5
  |
3 |
4 |     //declare a storage variable
5 |     counter: u64 = 0,
  |     ------- This storage declaration is never accessed and can be removed.
6 | }
  |
____

error
  --> /home/sheys/fuelvm-projects/counter/src/main.sw:22:16
   |
20 |
21 |         //using implicit return
22 |         return storage.counter;
   |                ^^^^^^^^^^^^^^^ Mismatched types.
expected: u64
found:    StorageKey<u64>.
help: Return statement must return the declared function return type.
23 |
24 |     }
   |
____

error
  --> /home/sheys/fuelvm-projects/counter/src/main.sw:28:9
   |
26 |
27 |     fn increment() {
28 |         storage.counter = storage.counter + 1;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This expression is not valid on the left hand side of a reassignment.
29 |     }
30 | }
   |
____

error
  --> /home/sheys/fuelvm-projects/counter/src/main.sw:20:5
   |
18 |
19 |       #[storage(read)]
20 |       fn counter() -> u64 {
   |  _____^
21 | |         //using implicit return
22 | |         return storage.counter;
23 | |
24 | |     }
   | |_____^ This path must return a value of type "u64" from function "counter", but it does not.
25 |
26 |       #[storage(read, write)]
   |
____

  Aborting due to 3 errors.
  Error: Failed to compile counter

I recently read that there’s a storage issue with beta-4 testnet here, I don’t think that has been resolved yet… But how can I move forward?

  1. Regarding point 2, thanks for the information :+1: