remove rust bindings for now (#812)

Remove the rust bindings for now since they make development and
releasing more complicated.

guidance/models/_model.py

@@ -36,9 +36,7 @@
         "Failed to load guidance.cpp, falling back to Python mirror implementations..."
     )
     from .. import _cpp as cpp
-
 from ._guidance_engine_metrics import GuidanceEngineMetrics
-from .._rust.guidancerust import engine_start
 from .._utils import softmax, CaptureEvents
 from .._parser import EarleyCommitParser, Parser
 from .._grammar import (
@@ -741,9 +739,6 @@ def __call__(self, parser, grammar, ensure_bos_token=True):
 
         self.start(parser, grammar, ensure_bos_token)
 
-        # TODO: remove this after the next release. This verifies that calling Rust works.
-        assert("def" == engine_start("abc", "def", 1))
-
         logits = None
         while True:
             is_done, logits_state, response_state = self.next(logits)

pyproject.toml

@@ -3,7 +3,6 @@ requires = [
     "setuptools>=42",
     "wheel",
     "pybind11>=2.10.0",
-    "setuptools-rust",
 ]
 build-backend = "setuptools.build_meta"
 

setup.py

@@ -17,7 +17,6 @@
 import codecs
 from setuptools import setup, find_packages
 from pybind11.setup_helpers import Pybind11Extension, build_ext
-from setuptools_rust import Binding, RustExtension
 
 here = os.path.abspath(os.path.dirname(__file__))
 
@@ -91,13 +90,6 @@ def find_version(*file_paths):
             "guidance.cpp", ["guidance/_cpp/main.cpp", "guidance/_cpp/byte_trie.cpp"]
         )
     ],
-    rust_extensions=[
-        RustExtension(
-            "guidance._rust.guidancerust",
-            "guidance/_rust/Cargo.toml",
-            binding=Binding.PyO3,
-        )
-    ],
     cmdclass={"build_ext": build_ext},
     python_requires=">=3.8",
     install_requires=install_requires,