For build-in function compile() in mode 'single',  only single statement can be well compiled. If we compile multiple statements,  the parser will raise a syntaxError. Seeing the following two programs,  In program 1, 2 statement are compiled. So the parser raises a Syntax error. It's the expected output. However, if we insert a nested multi-line assignment in this code(see program 2), 3 statements are compiled. We expect the parser also raise a Sytax error. But it' not.

Program 1 ( with expected results)
===================================
code1 = """
a = 1
b = 2
"""
c = compile(code1, "", "single")
===================================
Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/report/test1.py", line 641, in <module>
    c = compile(code1, "", "single")
  File "", line 2
    a = 1
         ^
SyntaxError: multiple statements found while compiling a single statement


Program 2 (with unexpected results)
=================================
code2 = """
c ='''
d=1
'''
a = 1
b = 2
"""
c = compile(code2, "", "single")
=================================


Expected out for program 2: Raise a syntaxError too， But it's not.

>> python -V
Python 3.10.0a2
>>uname -a
Linux xxm-System-Product-Name 4.15.0-64-generic #73~16.04.1-Ubuntu SMP Fri Sep 13 09:56:18 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux