Give mypy some love after rebase

Author: sbidoul

src/pip/_internal/commands/install.py

@@ -356,29 +356,32 @@ def run(self, options, args):
 
             # If we're using PEP 517, we cannot do a direct install
             # so we fail here.
-            pep517_build_failures = [
-                r for r in build_failures if r.use_pep517
-            ]
-            if pep517_build_failures:
+            pep517_build_failure_names = [
+                r.name   # type: ignore
+                for r in build_failures if r.use_pep517
+            ]  # type: List[str]
+            if pep517_build_failure_names:
                 raise InstallationError(
                     "Could not build wheels for {} which use"
                     " PEP 517 and cannot be installed directly".format(
-                        ", ".join(r.name  # type: ignore
-                                  for r in pep517_build_failures)))
+                        ", ".join(pep517_build_failure_names)
+                    )
+                )
 
             # For now, we just warn about failures building legacy
             # requirements, as we'll fall through to a direct
             # install for those.
-            legacy_build_failures = [
-                r for r in build_failures if not r.use_pep517
-            ]
-            if legacy_build_failures:
+            legacy_build_failure_names = [
+                r.name  # type: ignore
+                for r in build_failures if not r.use_pep517
+            ]  # type: List[str]
+            if legacy_build_failure_names:
                 deprecated(
                     reason=(
                         "Could not build wheels for {} which do not use "
                         "PEP 517. pip will fall back to legacy 'setup.py "
                         "install' for these.".format(
-                            ", ".join(r.name for r in legacy_build_failures)
+                            ", ".join(legacy_build_failure_names)
                         )
                     ),
                     replacement="to fix the wheel build issue reported above",