Another inconsistency in for x in range loop

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
javascript, python
Domain
compilers

Research direction

Start by reproducing the Python snippet and comparing its output with the generated JavaScript. Trace the compiler's handling of for loops over range and identify how the loop variable remains visible afterward; done means the transpiled behavior matches Python for this example and related cases.

Written by the indexing model from the issue text.

Description

STATE: under consideration 
for i in range(10):
     pass
print(i)

Will print 9 in python, but 10 in javascript, because the loop is unrolled into for (var i=0; i<10; i++)

Dominant language
Python
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Forks
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