Add regression test for issue 6915: features and transitive dev deps #12907
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Closes #6915.
That issue was fixed without realizing by #10103. In search of test coverage, I looked through
rg '[a-z0-9_-]+ = \["[a-z0-9_-]+/[a-z0-9_-]+"\]' tests/testsuite/
and did not find any existing test that exercises this situation. The tests added by #10103 are focused on cycles andcargo tree
, which is substantially different from #6915.Tested by
cargo test --test testsuite -- features::activating_feature_does_not_activate_transitive_dev_dependency
.