add a pp3-none-any tag

packaging/tags.py

@@ -481,4 +481,7 @@ def sys_tags(*, warn: bool = False) -> Iterator[Tag]:
     else:
         yield from generic_tags()
 
-    yield from compatible_tags()
+    if interp_name == "pp":
+        yield from compatible_tags(interpreter="pp3")
+    else:
+        yield from compatible_tags()

tests/test_tags.py

@@ -1180,3 +1180,14 @@ def manylinux_compatible(tag_major, tag_minor, tag_arch):
             "linux_x86_64",
         ]
         assert platforms == expected
+
+    def test_pypy_first_tag(self, monkeypatch):
+        # When building the complete list of pypy tags, make sure the first
+        # <interpreter>-none-any one is pp3-none-any
+        monkeypatch.setattr(tags, "interpreter_name", lambda: "pp")
+
+        for tag in tags.sys_tags():
+            if tag.platform == "any":
+                break
+
+        assert tag == tags.Tag("pp3", "none", "any")