fix the rust compiler version for building scallopy

Author: ControlNet

README.md

@@ -73,6 +73,8 @@ pixi shell
 
 Option 2: Building from source (You may need to setup the CUDA and PyTorch manually):
 ```Bash
+conda install conda-forge/label/rust_dev::rust=1.78 -c conda-forge -y
+pip install "git+https://github.com/scallop-lang/scallop.git@f8fac18#egg=scallopy&subdirectory=etc/scallopy"
 pip install -e .
 ```
 

pixi.toml

@@ -28,7 +28,7 @@ cuda = { version = "==11.8.0", channel = "nvidia/label/cuda-11.8.0" }
 cuda-libraries-dev = { version = "==11.8.0", channel = "nvidia/label/cuda-11.8.0" }
 cuda-version = "==11.8"
 numpy = "<2.0"
-rust = { version = "*", channel = "conda-forge/label/rust_dev" }
+rust = { version = "==1.78.0.dev20240310", channel = "conda-forge/label/rust_dev" }
 python-dotenv = "*"
 word2number = ">=1.1, <2"
 rich = ">=14.0.0,<15"