> ## Documentation Index
> Fetch the complete documentation index at: https://starkware-9575960b-starknet-privacy-docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# core::gas::GasBuiltin

The gas builtin.
This type is used to handle gas in the Cairo code.
Contains the amount of gas available for the current run.

## Signature

```rust theme={null}
pub extern type GasBuiltin;
```