Variable's value being updated without reassigning after running skip.

[0xSpraggins]

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 (d28a337 2024-08-27T00:19:36.462740000Z)

What command(s) is the bug in?

forge test

Operating System

macOS (Apple Silicon)

Describe the bug

Within a foundry test script I am assigning a uint256 variable the value of block.timestamp. Later on after running skip() the original variable automatically updats to reflect the new block.timestamp without the variable being manually reassigned in the code.

Current Code:

uint256 startingTime = block.timestamp;
console2.log("startingTime: ", startingTime) // Returns 604801

skip(180 days);

console2.log("startingTime: ", startingTime) // Returns 16156801

[DaniPopes]

This happens with via-ir

See

• Strange block.timestamp / warp interactions with via-ir #3806
• vm.roll() effect delayed when via_ir = true in solidity >=0.8.15 #4934
• block.timestamp bugs when using skip #6180

You can use vm.getBlockTimestamp() and other getter methods in vm to avoid compiler optimizations.