annotate: does not handle if False properly / consistently #659
Description
Originally reported by Anonymous
coverage annotate considers lines after if False to be covered:
% python -m coverage run t.py && python -m coverage annotate t.py && python -m coverage report -m && cat t.py,cover
1
Name Stmts Miss Cover Missing
-------------------------------------
t.py 1 0 100%
> if False:
> print('never')
> print(1)
I know that if False is a special case (optimization), but AnnotateReporter.annotate_file should handle it properly.
analysis.statements is [3] in this case, that's why the covered logic kicks in later only.
Since covered gets not updated for the if False, it will be considered to be uncovered in the following case, because the previous line sets covered=False:
1
Name Stmts Miss Cover Missing
-------------------------------------
t.py 4 1 75% 3
> a = 0
> if a:
! print(0)
! if False:
! print('never')
> print(1)