New submission from Ned Batchelder <[email protected]>:
(Using CPython commit c95f8bc270.)
This program has an "if 0:" line that becomes a NOP bytecode. It didn't used
to in Python 3.9
print(1)
if 0: # line 2
print(3)
print(4)
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
1
line <string> 2 @8
line <string> 4 @10
4
return <string> 4 @20
Using Python3.9 gives this output:
call <string> 1 @-1
line <string> 1 @0
1
line <string> 4 @8
4
return <string> 4 @18
Is this change intentional?
----------
messages: 383452
nosy: Mark.Shannon, nedbat
priority: normal
severity: normal
status: open
title: "if 0:" lines are traced; they didn't use to be
type: behavior
versions: Python 3.10
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Python tracker <[email protected]>
<https://bugs.python.org/issue42693>
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