--- a/lib/python3.8/site-packages/pip/_internal/distributions/sdist.py	Mon Jul 27 03:47:31 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,104 +0,0 @@
-import logging
-
-from pip._internal.build_env import BuildEnvironment
-from pip._internal.distributions.base import AbstractDistribution
-from pip._internal.exceptions import InstallationError
-from pip._internal.utils.subprocess import runner_with_spinner_message
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from typing import Set, Tuple
-
-    from pip._vendor.pkg_resources import Distribution
-    from pip._internal.index.package_finder import PackageFinder
-
-
-logger = logging.getLogger(__name__)
-
-
-class SourceDistribution(AbstractDistribution):
-    """Represents a source distribution.
-
-    The preparation step for these needs metadata for the packages to be
-    generated, either using PEP 517 or using the legacy `setup.py egg_info`.
-    """
-
-    def get_pkg_resources_distribution(self):
-        # type: () -> Distribution
-        return self.req.get_dist()
-
-    def prepare_distribution_metadata(self, finder, build_isolation):
-        # type: (PackageFinder, bool) -> None
-        # Load pyproject.toml, to determine whether PEP 517 is to be used
-        self.req.load_pyproject_toml()
-
-        # Set up the build isolation, if this requirement should be isolated
-        should_isolate = self.req.use_pep517 and build_isolation
-        if should_isolate:
-            self._setup_isolation(finder)
-
-        self.req.prepare_metadata()
-
-    def _setup_isolation(self, finder):
-        # type: (PackageFinder) -> None
-        def _raise_conflicts(conflicting_with, conflicting_reqs):
-            # type: (str, Set[Tuple[str, str]]) -> None
-            format_string = (
-                "Some build dependencies for {requirement} "
-                "conflict with {conflicting_with}: {description}."
-            )
-            error_message = format_string.format(
-                requirement=self.req,
-                conflicting_with=conflicting_with,
-                description=', '.join(
-                    '{} is incompatible with {}'.format(installed, wanted)
-                    for installed, wanted in sorted(conflicting)
-                )
-            )
-            raise InstallationError(error_message)
-
-        # Isolate in a BuildEnvironment and install the build-time
-        # requirements.
-        pyproject_requires = self.req.pyproject_requires
-        assert pyproject_requires is not None
-
-        self.req.build_env = BuildEnvironment()
-        self.req.build_env.install_requirements(
-            finder, pyproject_requires, 'overlay',
-            "Installing build dependencies"
-        )
-        conflicting, missing = self.req.build_env.check_requirements(
-            self.req.requirements_to_check
-        )
-        if conflicting:
-            _raise_conflicts("PEP 517/518 supported requirements",
-                             conflicting)
-        if missing:
-            logger.warning(
-                "Missing build requirements in pyproject.toml for %s.",
-                self.req,
-            )
-            logger.warning(
-                "The project does not specify a build backend, and "
-                "pip cannot fall back to setuptools without %s.",
-                " and ".join(map(repr, sorted(missing)))
-            )
-        # Install any extra build dependencies that the backend requests.
-        # This must be done in a second pass, as the pyproject.toml
-        # dependencies must be installed before we can call the backend.
-        with self.req.build_env:
-            runner = runner_with_spinner_message(
-                "Getting requirements to build wheel"
-            )
-            backend = self.req.pep517_backend
-            assert backend is not None
-            with backend.subprocess_runner(runner):
-                reqs = backend.get_requires_for_build_wheel()
-
-        conflicting, missing = self.req.build_env.check_requirements(reqs)
-        if conflicting:
-            _raise_conflicts("the backend dependencies", conflicting)
-        self.req.build_env.install_requirements(
-            finder, missing, 'normal',
-            "Installing backend dependencies"
-        )