capture coverage information without stopping the coverage tool.
[ruby-core:67940] [Feature #10816]
* test/coverage/test_coverage.rb: test for change.
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instead of `p' to get rid of a side effect.
Kernel#p without any argument seems to do nothing, but flushes stdout.
and, if stdout is redirected to file, fsync() will be called on
Windows. so, when running test-all on Windows with redirection, such
as CI environment, this test took a lot of time.
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line is out of the way. rb_sourceline() is unreliable when source
code is big. [ruby-dev:44413]
* test/coverage/test_coverage.rb: add a test for above.
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some minor nonfree OS. I have no means of debugging the bug. My
personal opinion is that such OS should be unsupported unless there
is an active maintainer. [ruby-core:37352]
* test/coverage/test_coverage.rb: ditto.
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