seen while byte-compiling the attached IN.py on x86_64-linux-gnu.

$ python3.5 -m py_compile IN.py 
Sorry: IndentationError: too many levels of indentation (IN.py, line 806)

the very same IN.py is accepted by 3.4.

looks like a parser issue:

$ for i in $(seq 200); do echo "def f$i(x): return (x)" >> foo.py; done
$ python3.5 -m py_compile foo.py 
Sorry: IndentationError: too many levels of indentation (foo.py, line 100)

$ for i in $(seq 200); do echo "def f$i(x):">>bar.py; echo "    return (x)" >> bar.py; done
$ python3.5 -m py_compile bar.py

this seems to be caused by the PEP 492 merge in r95969.

New changeset fb5fcae0cf1f by Yury Selivanov in branch 'default':
Issue 24226: Fix parsing of many sequential one-line 'def' statements.
https://hg.python.org/cpython/rev/fb5fcae0cf1f

Arfrever, Matthias, 
Thanks for reporting this issue.  It should now be fixed.  Please verify that it works for your usecase.

This change works for me.

Thanks! Closing the issue.