Using deal for OUSD token

[amatureApe]

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge 0.2.0 (06f7c9c 2023-03-18T00:16:11.192812Z)

What command(s) is the bug in?

No response

Operating System

macOS (Apple Silicon)

Describe the bug

Calling deal when trying to mint OUSD (0x2A8e1E676Ec238d8A992307B495b45B3fEAa5e86 - mainnet) returns the following error below.

[FAIL. Reason: stdStorage find(StdStorage): Slot(s) not found. Counterexample: calldata=0x202da9aa0000000000000000000000000000000000000000000000000000000000000000, args=[0]]

[mds1]

The OUSD contract's balanceOf method dynamically computes the balance to return (like a rebase token), whereas the deal cheat only supports tokens that return balanceOf by reading a value directly form a storage slot, because deal works by changing the value in the balanceOf storage slot. As a result this token is not currently supported by forge-std, similar to foundry-rs/forge-std#140

As a workaround you can find an OUSD whale from etherscan, prank as that user, and transfer tokens to any address you need

(For future reference, deal for tokens is a forge-std cheat, not a native forge cheat, so this issue should be in the forge-std repo)