with open('crates/fluids/src/coolprop.rs', 'r') as f:
    text = f.read()

# 1. Bring FluidBackend into scope at the top of the file
text = text.replace('use crate::backend::DampedBackend;', 'use crate::backend::{DampedBackend, FluidBackend};')
if 'use crate::backend::FluidBackend;' not in text and 'use crate::backend::{DampedBackend, FluidBackend};' not in text:
    text = text.replace('use crate::errors::{FluidError, FluidResult};', 'use crate::errors::{FluidError, FluidResult};\nuse crate::backend::FluidBackend;')

# 2. Fix _fluid back to fluid in phase_mix
text = text.replace('fn phase_mix(&self, _fluid: FluidId, state: FluidState)', 'fn phase_mix(&self, fluid: FluidId, state: FluidState)')

with open('crates/fluids/src/coolprop.rs', 'w') as f:
    f.write(text)