[issue40547] 2to3 raise can silently remove code from old 2.4 string exceptions

[Irit Katriel]

Change by Irit Katriel :


--
resolution:  -> wont fix
stage:  -> resolved
status: open -> closed
superseder:  -> Close 2to3 issues and list them here

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[issue40547] 2to3 raise can silently remove code from old 2.4 string exceptions

[Terry J. Reedy]

Change by Terry J. Reedy :


--
nosy: +benjamin.peterson

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[issue40547] 2to3 raise can silently remove code from old 2.4 string exceptions

[Rémy Oudompheng]

New submission from Rémy Oudompheng :

When running "2to3 -f raise" on the following code, which uses an old Python 
2.4 raise of a string:

def f():
raise ("message %s %s" % (1, 2))

try:
f()
finally:
pass

I obtain the following quite surprising result. I would have expected to get 
either an error or leave the original file unchanged, because "raise (s)" is 
syntactically valid although incorrect. 

$ 2to3 -f raise w.py
RefactoringTool: Refactored w.py
--- w.py(original)
+++ w.py(refactored)
@@ -1,5 +1,5 @@
 def f():
-raise ("message %s %s" % (1, 2))
+raise "message %s %s"
 
 try:
 f()

--
components: 2to3 (2.x to 3.x conversion tool)
messages: 368355
nosy: Rémy Oudompheng
priority: normal
severity: normal
status: open
title: 2to3 raise can silently remove code from old 2.4 string exceptions
type: behavior
versions: Python 3.7, Python 3.8

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