[issue12291] file written using marshal in 3.2 can be read by 2.7, but not 3.2 or 3.3

[engelbert gruber]

engelbert gruber <grubert at users.sourceforge.net> added the comment:

add interleaved writing to the same file (which might happen or not?)

the tests pass when vinay's marshal.c is applied.

sorry for another patch

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Added file: http://bugs.python.org/file22479/multiple_dump_load_read_write_test.patch

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