bug.py:7: error: INTERNAL ERROR -- Please try using mypy master on GitHub:
https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
Please report a bug at https://github.com/python/mypy/issues
version: 0.990+dev.a3a5d73f7407f9565abcfd04689870e7c992f833
Traceback (most recent call last):
  File "/home/harrison/.local/bin/mypy", line 8, in <module>
    sys.exit(console_entry())
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/__main__.py", line 15, in console_entry
    main()
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/main.py", line 95, in main
    res, messages, blockers = run_build(sources, options, fscache, t0, stdout, stderr)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/main.py", line 174, in run_build
    res = build.build(sources, options, None, flush_errors, fscache, stdout, stderr)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/build.py", line 193, in build
    result = _build(
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/build.py", line 276, in _build
    graph = dispatch(sources, manager, stdout)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/build.py", line 2890, in dispatch
    process_graph(graph, manager)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/build.py", line 3274, in process_graph
    process_stale_scc(graph, scc, manager)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/build.py", line 3375, in process_stale_scc
    graph[id].type_check_first_pass()
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/build.py", line 2307, in type_check_first_pass
    self.type_checker().check_first_pass()
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/checker.py", line 462, in check_first_pass
    self.accept(d)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/checker.py", line 570, in accept
    stmt.accept(self)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/nodes.py", line 810, in accept
    return visitor.visit_func_def(self)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/checker.py", line 935, in visit_func_def
    self._visit_func_def(defn)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/checker.py", line 939, in _visit_func_def
    self.check_func_item(defn, name=defn.name)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/checker.py", line 1003, in check_func_item
    self.check_func_def(defn, typ, name)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/checker.py", line 1023, in check_func_def
    expanded = self.expand_typevars(defn, typ)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/checker.py", line 1656, in expand_typevars
    result.append((expand_func(defn, mapping), expanded))
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/checker.py", line 6661, in expand_func
    ret = visitor.node(defn)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 618, in node
    new = node.accept(self)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/nodes.py", line 810, in accept
    return visitor.visit_func_def(self)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 182, in visit_func_def
    self.block(node.body),
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 651, in block
    new = self.visit_block(block)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 264, in visit_block
    return Block(self.statements(node.body))
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 662, in statements
    return [self.stmt(stmt) for stmt in statements]
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 662, in <listcomp>
    return [self.stmt(stmt) for stmt in statements]
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 635, in stmt
    new = stmt.accept(self)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/nodes.py", line 1377, in accept
    return visitor.visit_for_stmt(self)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 327, in visit_for_stmt
    self.block(node.body),
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 651, in block
    new = self.visit_block(block)
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 264, in visit_block
    return Block(self.statements(node.body))
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 662, in statements
    return [self.stmt(stmt) for stmt in statements]
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 662, in <listcomp>
    return [self.stmt(stmt) for stmt in statements]
  File "/home/harrison/.local/lib/python3.10/site-packages/mypy/treetransform.py", line 636, in stmt
    assert isinstance(new, Statement)
AssertionError:
bug.py:7: : note: use --pdb to drop into pdb

from collections.abc import Iterable
from typing import TypeVar

S = TypeVar("S", int, str)


def my_func(pairs: Iterable[tuple[S, S]]) -> None:

    for pair in pairs:
        match pair:

            # # Some dummy function
            # case (int(x), int(y)):
            #     print(x + y)

            # # Some dummy function
            # case (str(x), str(y)):
            #     print(x[0] + y[-1])

            case _:
                raise ValueError(pair)