test_mutate fails for a column name including ;

[exarkun]

Test Pass 1
_zkapauthorizer.tests.test_sql
  MutateTests
    test_mutate ... Falsifying example: test_mutate(
    change=Update(table_name='0', table=Table(columns=[('\\', Column(affinity=<StorageAffinity.BLOB: 3>)), (';', Column(affinity=<StorageAffinity.TEXT: 2>))]), fields=(b'', '')),
    self=<_zkapauthorizer.tests.test_sql.MutateTests.test_mutate id=0x7f9216359a00>,
)
                                                    [ERROR]

===============================================================================
[ERROR]
Traceback (most recent call last):
Failure: testtools.testresult.real._StringException: Traceback (most recent call last):
  File "/home/exarkun/Work/PrivateStorage/ZKAPAuthorizer/src/_zkapauthorizer/tests/test_sql.py", line 44, in test_mutate
    @given(mutations)
  File "/nix/store/cbbm0m589h3bkqnx9qp40iswcfs8gl6y-python3-3.9.6-env/lib/python3.9/site-packages/hypothesis/core.py", line 1145, in wrapped_test
    state.execute_once(
  File "/nix/store/cbbm0m589h3bkqnx9qp40iswcfs8gl6y-python3-3.9.6-env/lib/python3.9/site-packages/hypothesis/core.py", line 661, in execute_once
    result = self.test_runner(data, run)
  File "/nix/store/cbbm0m589h3bkqnx9qp40iswcfs8gl6y-python3-3.9.6-env/lib/python3.9/site-packages/hypothesis/executors.py", line 47, in default_new_style_executor
    return function(data)
  File "/nix/store/cbbm0m589h3bkqnx9qp40iswcfs8gl6y-python3-3.9.6-env/lib/python3.9/site-packages/hypothesis/core.py", line 657, in run
    return test(*args, **kwargs)
  File "/home/exarkun/Work/PrivateStorage/ZKAPAuthorizer/src/_zkapauthorizer/tests/test_sql.py", line 52, in test_mutate
    statement_mutates(change.statement()),
  File "/home/exarkun/Work/PrivateStorage/ZKAPAuthorizer/src/_zkapauthorizer/sql.py", line 281, in statement_mutates
    (parsed,) = parse(statement)
ValueError: too many values to unpack (expected 1)


_zkapauthorizer.tests.test_sql.MutateTests.test_mutate
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