Pragmas on continued long lines don't work

[nedbat]

(From https://stackoverflow.com/questions/54111889/coverage-pragma-no-branch-with-multiline-statement)

A pragma comment on the continuation lines of a multi-line if-statement won't have an effect:

For the python coverage package, a missing else can be ignored for the resulting coverage by using # pragma: no branch.

It seems, that this is not working when breaking a long if statement in multiple lines like this:

if this_is_a_verylong_boolean_expression == True and another_long_expression \
    and here_another_expression:  # pragma: no branch
    do_something()

[devdanzin]

This happens because coverage.results.Analysis.arcs_missing() depends on coverage.parser.PythonParser.lines_matching() to collect lines marked as pragma: no branch, but lines_matching() records the raw line number of the match, not taking multi-line statements into account.

If we record the lines by mapping them using parser._multiline instead, the pragma works.

[nedbat]

Fixed in commit 277c8c4

[nedbat]

This is now released as part of coverage 7.5.1.