Bug report

Bug description:

In python 3.13.8 calling inspect.getsourcelines on a decorated function with a comment between the decorator and the name only returns the function declaration, the body is skipped.

import inspect
def dummy(fn):
    return fn
@dummy
def test1(a, b):
    return a
@dummy
#comment
def test2(a, b):
    return a
print(inspect.getsourcelines(test1))
print("------------------")
print(inspect.getsourcelines(test2))

returns

(['@dummy\n', 'def test1(a, b):\n', '    return a\n'], 6)
------------------
(['@dummy\n', '#comment\n', 'def test2(a, b):\n'], 10)

the source of test2 is incomplete and missing the return statement.

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Linked PRs

gh-139783: Fix inspect.getsourcelines() for the case when a decorator is followed by a comment or an empty line #139836
[3.14] gh-139783: Fix inspect.getsourcelines() for the case when a decorator is followed by a comment or an empty line (GH-139836) #139889
[3.13] gh-139783: Fix inspect.getsourcelines() for the case when a decorator is followed by a comment or an empty line (GH-139836) #139890