Example:

>>> compile("pass\n(1+)\npass", "<string>", "exec")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "", line 2
    (1+)
pass
       ^
SyntaxError: invalid syntax
>>> 

Note that the input is

pass
(1+)
pass

The second "pass" (and in fact the entire file) leaks into the SyntaxError object's text attribute.

This only happens when the file (here "<string>") cannot be read.

It's not specific to compile(), it seems fundamental in the C-level pegen API.