Fixed bug that leads to a false negative when using a TypeVar with a …

[erictraut]

…default prior to another TypeVar without a default in a type alias defined with .... This addresses #9120.

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

pytest (https://github.com/pytest-dev/pytest)
-   /tmp/mypy_primer/projects/pytest/src/_pytest/doctest.py:421:11 - error: Type "None" is not assignable to declared type "property"
+   /tmp/mypy_primer/projects/pytest/src/_pytest/doctest.py:421:11 - error: Type "obj" is not assignable to declared type "property"

psycopg (https://github.com/psycopg/psycopg)
-   /tmp/mypy_primer/projects/psycopg/docs/lib/libpq_docs.py:129:30 - error: Cannot access attribute "doctreedir" for class "None"
+   /tmp/mypy_primer/projects/psycopg/docs/lib/libpq_docs.py:129:30 - error: Cannot access attribute "doctreedir" for class "app"
-   /tmp/mypy_primer/projects/psycopg/docs/lib/libpq_docs.py:143:25 - error: Cannot access attribute "config" for class "None"
+   /tmp/mypy_primer/projects/psycopg/docs/lib/libpq_docs.py:143:25 - error: Cannot access attribute "config" for class "app"

openlibrary (https://github.com/internetarchive/openlibrary)
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/archive.py:85:29 - error: Argument of type "None" cannot be assigned to parameter "a" of type "StrPath" in function "join"
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/archive.py:85:29 - error: Argument of type "data_root" cannot be assigned to parameter "a" of type "StrPath" in function "join"
-     Type "None" is not assignable to type "StrPath"
+     Type "data_root" is not assignable to type "StrPath"
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/archive.py:129:29 - error: Argument of type "None" cannot be assigned to parameter "a" of type "StrPath" in function "join"
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/archive.py:129:29 - error: Argument of type "data_root" cannot be assigned to parameter "a" of type "StrPath" in function "join"
-     Type "None" is not assignable to type "StrPath"
+     Type "data_root" is not assignable to type "StrPath"
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/archive.py:154:44 - error: Argument of type "None" cannot be assigned to parameter "a" of type "StrPath" in function "join"
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/archive.py:154:44 - error: Argument of type "data_root" cannot be assigned to parameter "a" of type "StrPath" in function "join"
-     Type "None" is not assignable to type "StrPath"
+     Type "data_root" is not assignable to type "StrPath"
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/archive.py:349:17 - error: Argument of type "None" cannot be assigned to parameter "a" of type "StrPath" in function "join"
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/archive.py:349:17 - error: Argument of type "data_root" cannot be assigned to parameter "a" of type "StrPath" in function "join"
-     Type "None" is not assignable to type "StrPath"
+     Type "data_root" is not assignable to type "StrPath"
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/archive.py:480:29 - error: Argument of type "None" cannot be assigned to parameter "a" of type "StrPath" in function "join"
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/archive.py:480:29 - error: Argument of type "data_root" cannot be assigned to parameter "a" of type "StrPath" in function "join"
-     Type "None" is not assignable to type "StrPath"
+     Type "data_root" is not assignable to type "StrPath"
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/code.py:370:25 - error: Argument of type "None" cannot be assigned to parameter "a" of type "StrPath" in function "join"
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/code.py:370:25 - error: Argument of type "data_root" cannot be assigned to parameter "a" of type "StrPath" in function "join"
-     Type "None" is not assignable to type "StrPath"
+     Type "data_root" is not assignable to type "StrPath"
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/coverlib.py:111:13 - error: Argument of type "None" cannot be assigned to parameter "a" of type "StrPath" in function "join"
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/coverlib.py:111:13 - error: Argument of type "data_root" cannot be assigned to parameter "a" of type "StrPath" in function "join"
-     Type "None" is not assignable to type "StrPath"
+     Type "data_root" is not assignable to type "StrPath"
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/coverlib.py:114:29 - error: Argument of type "None" cannot be assigned to parameter "a" of type "StrPath" in function "join"
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/coverlib.py:114:29 - error: Argument of type "data_root" cannot be assigned to parameter "a" of type "StrPath" in function "join"
-     Type "None" is not assignable to type "StrPath"
+     Type "data_root" is not assignable to type "StrPath"
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_coverstore.py:46:14 - error: Operator "+" not supported for types "None" and "Literal['/bad']" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_coverstore.py:46:14 - error: Operator "+" not supported for types "data_root" and "Literal['/bad']" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_coverstore.py:49:14 - error: Operator "+" not supported for types "None" and "Literal['/bad']" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_coverstore.py:49:14 - error: Operator "+" not supported for types "data_root" and "Literal['/bad']" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_coverstore.py:83:24 - error: Argument of type "None" cannot be assigned to parameter "a" of type "BytesPath" in function "join"
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_coverstore.py:83:24 - error: Argument of type "data_root" cannot be assigned to parameter "a" of type "BytesPath" in function "join"
-     Type "None" is not assignable to type "BytesPath"
+     Type "data_root" is not assignable to type "BytesPath"
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_coverstore.py:133:49 - error: Operator "+" not supported for types "None" and "Literal['/localdisk/a.jpg']" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_coverstore.py:133:49 - error: Operator "+" not supported for types "data_root" and "Literal['/localdisk/a.jpg']" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_coverstore.py:136:12 - error: Operator "+" not supported for types "None" and "Literal['/items/covers_0000/covers_0000_00.tar:1234:10']" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_coverstore.py:136:12 - error: Operator "+" not supported for types "data_root" and "Literal['/items/covers_0000/covers_0000_00.tar:1234:10']" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_webapp.py:95:16 - error: Operator "+" not supported for types "None" and "Literal['/localdisk/']" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/openlibrary/openlibrary/coverstore/tests/test_webapp.py:95:16 - error: Operator "+" not supported for types "data_root" and "Literal['/localdisk/']" (reportOperatorIssue)

sympy (https://github.com/sympy/sympy)
-             Type "None" is not assignable to type "SupportsRichComparison" (reportArgumentType)
+             Type "_size" is not assignable to type "SupportsRichComparison" (reportArgumentType)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/perm_groups.py:4181:59 - error: Cannot access attribute "index" for class "None"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/perm_groups.py:4181:59 - error: Cannot access attribute "index" for class "_array_form"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/perm_groups.py:4237:59 - error: Cannot access attribute "index" for class "None"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/perm_groups.py:4237:59 - error: Cannot access attribute "index" for class "_array_form"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1114:38 - error: Argument of type "None" cannot be assigned to parameter "start" of type "SupportsIndex" in function "__new__"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1114:38 - error: Argument of type "_size" cannot be assigned to parameter "start" of type "SupportsIndex" in function "__new__"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1117:21 - error: Operator "-" not supported for types "None" and "Literal[1]" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1117:21 - error: Operator "-" not supported for types "_size" and "Literal[1]" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1179:26 - error: Argument of type "None" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1179:26 - error: Argument of type "_size" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1520:13 - error: Operator "*" not supported for types "list[None]" and "None" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1520:13 - error: Operator "*" not supported for types "list[None]" and "_size" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1523:24 - error: Argument of type "None" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1523:24 - error: Argument of type "_size" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1656:29 - error: Operator ">" not supported for types "int" and "None" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1656:29 - error: Operator ">" not supported for types "int" and "_size" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1659:36 - error: Operator "-" not supported for types "None" and "Literal[1]" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1659:36 - error: Operator "-" not supported for types "_size" and "Literal[1]" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1665:35 - error: "None" is not iterable
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1665:35 - error: "_array_form" is not iterable
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1727:70 - error: Operator "-" not supported for types "None" and "Literal[1]" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1727:70 - error: Operator "-" not supported for types "_size" and "Literal[1]" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1897:13 - error: Operator "-" not supported for types "None" and "Literal[1]" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1897:13 - error: Operator "-" not supported for types "_size" and "Literal[1]" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1958:20 - error: Operator "-" not supported for types "None" and "int" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:1958:20 - error: Operator "-" not supported for types "_size" and "int" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2083:56 - error: Argument of type "None" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2083:56 - error: Argument of type "_size" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2382:17 - error: Operator "-=" not supported for types "None" and "int"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2382:17 - error: Operator "-=" not supported for types "_size" and "int"
-     Operator "-" not supported for types "None" and "int" (reportOperatorIssue)
+     Operator "-" not supported for types "_size" and "int" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2530:27 - error: Argument of type "None" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2530:27 - error: Argument of type "_size" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2704:24 - error: Argument of type "None" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2704:24 - error: Argument of type "_size" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2705:28 - error: Argument of type "None" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2705:28 - error: Argument of type "_size" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2710:25 - error: Operator "-" not supported for types "None" and "Literal[1]" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2710:25 - error: Operator "-" not supported for types "_size" and "Literal[1]" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2752:24 - error: Operator "-" not supported for types "None" and "Literal[1]" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2752:24 - error: Operator "-" not supported for types "_size" and "Literal[1]" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2793:24 - error: Argument of type "None" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2793:24 - error: Argument of type "_size" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2794:28 - error: Argument of type "None" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2794:28 - error: Argument of type "_size" cannot be assigned to parameter "stop" of type "SupportsIndex" in function "__new__"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2799:13 - error: Operator "-" not supported for types "None" and "int" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/permutations.py:2799:13 - error: Operator "-" not supported for types "_size" and "int" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/prufer.py:312:24 - error: Operator "-" not supported for types "None" and "Literal[3]" (reportOperatorIssue)
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/prufer.py:312:24 - error: Operator "-" not supported for types "_nodes" and "Literal[3]" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/prufer.py:314:13 - error: Operator "*=" not supported for types "Literal[1]" and "None"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/prufer.py:314:13 - error: Operator "*=" not supported for types "Literal[1]" and "_nodes"
-     Operator "*" not supported for types "Literal[1]" and "None" (reportOperatorIssue)
+     Operator "*" not supported for types "Literal[1]" and "_nodes" (reportOperatorIssue)
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/subsets.py:413:20 - error: Argument of type "None" cannot be assigned to parameter "obj" of type "Sized" in function "len"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/subsets.py:413:20 - error: Argument of type "_subset" cannot be assigned to parameter "obj" of type "Sized" in function "len"
-   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/subsets.py:453:20 - error: Argument of type "None" cannot be assigned to parameter "obj" of type "Sized" in function "len"
+   /tmp/mypy_primer/projects/sympy/sympy/combinatorics/subsets.py:453:20 - error: Argument of type "_superset" cannot be assigned to parameter "obj" of type "Sized" in function "len"

... (truncated 464 lines) ...

mongo-python-driver (https://github.com/mongodb/mongo-python-driver)
-   /tmp/mypy_primer/projects/mongo-python-driver/test/test_bson.py:1442:24 - error: Type "None" is not assignable to declared type "(self: Self@object) -> int"
+   /tmp/mypy_primer/projects/mongo-python-driver/test/test_bson.py:1442:24 - error: Type "__hash__" is not assignable to declared type "(self: Self@object) -> int"

mitmproxy (https://github.com/mitmproxy/mitmproxy)
-   /tmp/mypy_primer/projects/mitmproxy/mitmproxy/proxy/mode_specs.py:298:20 - error: Type "None" is not assignable to declared type "property"
+   /tmp/mypy_primer/projects/mitmproxy/mitmproxy/proxy/mode_specs.py:298:20 - error: Type "default_port" is not assignable to declared type "property"
-   /tmp/mypy_primer/projects/mitmproxy/mitmproxy/proxy/mode_specs.py:310:20 - error: Type "None" is not assignable to declared type "property"
+   /tmp/mypy_primer/projects/mitmproxy/mitmproxy/proxy/mode_specs.py:310:20 - error: Type "default_port" is not assignable to declared type "property"

pip (https://github.com/pypa/pip)
-   /tmp/mypy_primer/projects/pip/src/pip/_internal/resolution/resolvelib/candidates.py:343:19 - error: Type "None" is not assignable to declared type "property"
+   /tmp/mypy_primer/projects/pip/src/pip/_internal/resolution/resolvelib/candidates.py:343:19 - error: Type "source_link" is not assignable to declared type "property"
-   /tmp/mypy_primer/projects/pip/src/pip/_internal/resolution/resolvelib/candidates.py:534:19 - error: Type "None" is not assignable to declared type "property"
+   /tmp/mypy_primer/projects/pip/src/pip/_internal/resolution/resolvelib/candidates.py:534:19 - error: Type "source_link" is not assignable to declared type "property"
-   /tmp/mypy_primer/projects/pip/src/pip/_vendor/urllib3/poolmanager.py:347:46 - error: Cannot access attribute "use_forwarding_for_https" for class "None"
+   /tmp/mypy_primer/projects/pip/src/pip/_vendor/urllib3/poolmanager.py:347:46 - error: Cannot access attribute "use_forwarding_for_https" for class "proxy_config"
-   /tmp/mypy_primer/projects/pip/src/pip/_vendor/urllib3/response.py:111:32 - error: Cannot access attribute "Decompressor" for class "None"
+   /tmp/mypy_primer/projects/pip/src/pip/_vendor/urllib3/response.py:111:32 - error: Cannot access attribute "Decompressor" for class "brotli"

streamlit (https://github.com/streamlit/streamlit)
-   /tmp/mypy_primer/projects/streamlit/lib/tests/streamlit/runtime/scriptrunner/test_data/runtime_error.py:24:5 - error: Cannot access attribute "do_a_thing" for class "None"
+   /tmp/mypy_primer/projects/streamlit/lib/tests/streamlit/runtime/scriptrunner/test_data/runtime_error.py:24:5 - error: Cannot access attribute "do_a_thing" for class "bad"

scrapy (https://github.com/scrapy/scrapy)
-   /tmp/mypy_primer/projects/scrapy/tests/spiders.py:371:27 - error: Argument of type "None" cannot be assigned to parameter "url" of type "str" in function "__init__"
+   /tmp/mypy_primer/projects/scrapy/tests/spiders.py:371:27 - error: Argument of type "seed" cannot be assigned to parameter "url" of type "str" in function "__init__"

dd-trace-py (https://github.com/DataDog/dd-trace-py)
-   /tmp/mypy_primer/projects/dd-trace-py/setup.py:159:29 - error: Argument of type "None" cannot be assigned to parameter "args" of type "StrPath" in function "__new__"
+   /tmp/mypy_primer/projects/dd-trace-py/setup.py:159:29 - error: Argument of type "download_dir" cannot be assigned to parameter "args" of type "StrPath" in function "__new__"
-     Type "None" is not assignable to type "StrPath"
+     Type "download_dir" is not assignable to type "StrPath"
-   /tmp/mypy_primer/projects/dd-trace-py/setup.py:159:29 - error: Argument of type "None" cannot be assigned to parameter "args" of type "StrPath" in function "__init__"
+   /tmp/mypy_primer/projects/dd-trace-py/setup.py:159:29 - error: Argument of type "download_dir" cannot be assigned to parameter "args" of type "StrPath" in function "__init__"
-     Type "None" is not assignable to type "StrPath"
+     Type "download_dir" is not assignable to type "StrPath"
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:381:20 - error: "None" is not iterable
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:381:20 - error: "NoSuchProcess" is not iterable
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:381:20 - error: "ZombieProcess" is not iterable
+     "__iter__" method not defined (reportGeneralTypeIssues)
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:381:20 - error: "tuple[None, None]" is not a valid exception class (reportGeneralTypeIssues)
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:381:20 - error: "tuple[NoSuchProcess, ZombieProcess]" is not a valid exception class (reportGeneralTypeIssues)
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:509:12 - error: "None" is not iterable
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:509:12 - error: "NoSuchProcess" is not iterable
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:509:12 - error: "None" is not a valid exception class (reportGeneralTypeIssues)
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:509:12 - error: "NoSuchProcess" is not a valid exception class (reportGeneralTypeIssues)
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:511:12 - error: "None" is not iterable
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:511:12 - error: "AccessDenied" is not iterable
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:511:12 - error: "None" is not a valid exception class (reportGeneralTypeIssues)
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psbsd.py:511:12 - error: "AccessDenied" is not a valid exception class (reportGeneralTypeIssues)
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:252:16 - error: "None" is not iterable
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:252:16 - error: "NoSuchProcess" is not iterable
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:252:16 - error: "None" is not a valid exception class (reportGeneralTypeIssues)
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:252:16 - error: "NoSuchProcess" is not a valid exception class (reportGeneralTypeIssues)
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:321:16 - error: "None" is not iterable
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:321:16 - error: "NoSuchProcess" is not iterable
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:321:16 - error: "None" is not a valid exception class (reportGeneralTypeIssues)
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:321:16 - error: "NoSuchProcess" is not a valid exception class (reportGeneralTypeIssues)
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:323:16 - error: "None" is not iterable
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:323:16 - error: "AccessDenied" is not iterable
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:323:16 - error: "None" is not a valid exception class (reportGeneralTypeIssues)
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:323:16 - error: "AccessDenied" is not a valid exception class (reportGeneralTypeIssues)
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:363:20 - error: "None" is not iterable
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:363:20 - error: "NoSuchProcess" is not iterable
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:363:20 - error: "None" is not a valid exception class (reportGeneralTypeIssues)
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_psosx.py:363:20 - error: "NoSuchProcess" is not a valid exception class (reportGeneralTypeIssues)
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pssunos.py:472:16 - error: "None" is not iterable
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pssunos.py:472:16 - error: "AccessDenied" is not iterable
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pssunos.py:472:16 - error: "None" is not a valid exception class (reportGeneralTypeIssues)
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pssunos.py:472:16 - error: "AccessDenied" is not a valid exception class (reportGeneralTypeIssues)
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pssunos.py:482:16 - error: "None" is not iterable
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pssunos.py:482:16 - error: "AccessDenied" is not iterable
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pssunos.py:482:16 - error: "None" is not a valid exception class (reportGeneralTypeIssues)
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pssunos.py:482:16 - error: "AccessDenied" is not a valid exception class (reportGeneralTypeIssues)
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pswindows.py:783:20 - error: "None" is not iterable
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pswindows.py:783:20 - error: "AccessDenied" is not iterable
-   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pswindows.py:783:20 - error: "None" is not a valid exception class (reportGeneralTypeIssues)
+   /tmp/mypy_primer/projects/dd-trace-py/ddtrace/vendor/psutil/_pswindows.py:783:20 - error: "AccessDenied" is not a valid exception class (reportGeneralTypeIssues)
-   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:362:46 - error: Argument of type "None" cannot be assigned to parameter "name" of type "str" in function "import_module"
+   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:362:46 - error: Argument of type "__module_name__" cannot be assigned to parameter "name" of type "str" in function "import_module"
-   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:380:46 - error: Argument of type "None" cannot be assigned to parameter "name" of type "str" in function "import_module"
+   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:380:46 - error: Argument of type "__module_name__" cannot be assigned to parameter "name" of type "str" in function "import_module"
-   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:400:46 - error: Argument of type "None" cannot be assigned to parameter "name" of type "str" in function "import_module"
+   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:400:46 - error: Argument of type "__module_name__" cannot be assigned to parameter "name" of type "str" in function "import_module"
-   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:421:46 - error: Argument of type "None" cannot be assigned to parameter "name" of type "str" in function "import_module"
+   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:421:46 - error: Argument of type "__module_name__" cannot be assigned to parameter "name" of type "str" in function "import_module"
-   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:442:46 - error: Argument of type "None" cannot be assigned to parameter "name" of type "str" in function "import_module"
+   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:442:46 - error: Argument of type "__module_name__" cannot be assigned to parameter "name" of type "str" in function "import_module"
-   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:464:46 - error: Argument of type "None" cannot be assigned to parameter "name" of type "str" in function "import_module"
+   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:464:46 - error: Argument of type "__module_name__" cannot be assigned to parameter "name" of type "str" in function "import_module"
-   /tmp/mypy_primer/projects/dd-trace-py/tests/contrib/patch.py:492:46 - error: Argument of type "None" cannot be assigned to parameter "name" of type "str" in function "import_module"

... (truncated 70 lines) ...```