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This patch raises an IndentationError rather than a
generic "invalid syntax" error for unexpected
indentation. Code to do this was already in
pythonrun.c:err_input() but was not being reached due
to a failure to pass the INDENT token in the perrdetail
structure. The patch also adds tests for the 3 kinds
of indentation errors (unexpected indent, no indent
where required, invalid outdent level) to test_syntax.py .