[xixi-box]

Fixes #22265

Root cause: var-annotated errors for iteration should point to the line where the variable is defined

Verified by running the failing test at b3ab06a32db2 (fails) and again with this patch applied (passes).

[github-actions]

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

prefect (https://github.com/PrefectHQ/prefect)
- src/prefect/utilities/collections.py:508: error: "None" object is not iterable  [misc]
+ src/prefect/utilities/collections.py:509: error: "None" object is not iterable  [misc]
- src/prefect/server/events/storage/__init__.py:80: error: "int" object is not iterable  [misc]
+ src/prefect/server/events/storage/__init__.py:88: error: "int" object is not iterable  [misc]

ibis (https://github.com/ibis-project/ibis)
- ibis/backends/sql/datatypes.py:1794: error: Need type annotation for "mapper"  [var-annotated]
+ ibis/backends/sql/datatypes.py:1796: error: Need type annotation for "mapper"  [var-annotated]
- ibis/expr/types/strings.py:973: error: Need type annotation for "pattern"  [var-annotated]
+ ibis/expr/types/strings.py:975: error: Need type annotation for "pattern"  [var-annotated]
- ibis/expr/types/strings.py:1019: error: Need type annotation for "pattern"  [var-annotated]
+ ibis/expr/types/strings.py:1021: error: Need type annotation for "pattern"  [var-annotated]
- ibis/expr/types/relations.py:1141: error: Need type annotation for "arg"  [var-annotated]
+ ibis/expr/types/relations.py:1143: error: Need type annotation for "arg"  [var-annotated]

jax (https://github.com/google/jax)
- jax/_src/api_util.py:769: error: Need type annotation for "path"  [var-annotated]
+ jax/_src/api_util.py:771: error: Need type annotation for "path"  [var-annotated]

sphinx (https://github.com/sphinx-doc/sphinx)
- sphinx/ext/doctest.py:443:9: error: Need type annotation for "node"  [var-annotated]
+ sphinx/ext/doctest.py:443:13: error: Need type annotation for "node"  [var-annotated]
- sphinx/versioning.py:43:5: error: Need type annotation for "node"  [var-annotated]
+ sphinx/versioning.py:43:9: error: Need type annotation for "node"  [var-annotated]
- sphinx/transforms/__init__.py:247:9: error: Need type annotation for "node"  [var-annotated]
+ sphinx/transforms/__init__.py:247:13: error: Need type annotation for "node"  [var-annotated]
- sphinx/transforms/__init__.py:289:9: error: Need type annotation for "node"  [var-annotated]
+ sphinx/transforms/__init__.py:289:13: error: Need type annotation for "node"  [var-annotated]
- sphinx/util/nodes.py:96:9: error: Need type annotation for "found"  [var-annotated]
+ sphinx/util/nodes.py:96:13: error: Need type annotation for "found"  [var-annotated]
- sphinx/util/nodes.py:331:5: error: Need type annotation for "node"  [var-annotated]
+ sphinx/util/nodes.py:331:9: error: Need type annotation for "node"  [var-annotated]