New submission from Ned Batchelder <[email protected]>:
(Using CPython commit 6b1ac809b9)
This program never executes line 6, but tracing it claims that it does:
a = b = x = y = z = 1
if a == 1:
if b == 1:
x = 4
else:
y = 6
else:
z = 8
assert (a, b, x, y, z) == (1, 1, 4, 1, 1)
Using a simple trace program
(https://github.com/nedbat/coveragepy/blob/master/lab/run_trace.py), it
produces this output:
call <string> 1 @-1
line <string> 1 @0
line <string> 2 @20
line <string> 3 @28
line <string> 4 @36
line <string> 6 @40
line <string> 9 @52
return <string> 9 @76
----------
components: Interpreter Core
messages: 384222
nosy: Mark.Shannon, nedbat
priority: normal
severity: normal
status: open
title: Nested if/else gets phantom else trace (3.10)
versions: Python 3.10
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Python tracker <[email protected]>
<https://bugs.python.org/issue42810>
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