[#97678] [Ruby master Feature#16752] :private param for const_set — bughitgithub@...
Issue #16752 has been reported by bughit (bug hit).
5 messages
2020/04/02
[ruby-core:97815] [Ruby master Bug#16776] Regression in coverage library
From:
mame@...
Date:
2020-04-10 17:20:24 UTC
List:
ruby-core #97815
Issue #16776 has been updated by mame (Yusuke Endoh).
Thank you for your report. The reason why the method execution is missed is because:
* coverage measurement is based on TracePoint mechanism (since 2.6), and
* no TracePoint event is fired during the execution of TracePoint hooks (to avoid infinite chain of hooks).
So, this is a limitation of TracePoint. Currently, the combination of multiple TracePoint hooks works not so great; they are completely exclusive.
This issue may be solved by improving TracePoint mechanism, but it is expensive to implement and @ko1 is negative. How severe is this issue for you?
----------------------------------------
Bug #16776: Regression in coverage library
https://bugs.ruby-lang.org/issues/16776#change-85033
* Author: deivid (David Rodr刕uez)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Hi!
I noticed a regression in the coverage library. I tried to write a minimal program to show it, hopefully it gives some clues or where the issue might lie.
In ruby 2.5.8 and earlier, the following program would print `{:lines=>[1, 1, nil]}`, showing that the body of the "foo" method was run once. However, on newer rubies, it prints `{:lines=>[1, 0, nil]}`, which is incorrect because the "foo" method body has actually been run once.
This is the repro script:
```ruby
# frozen_string_literal: true
require "coverage"
Coverage.start(lines: true)
code = <<~RUBY
def foo
"LOL"
end
RUBY
File.open("foo.rb", "w") { |f| f.write(code) }
require_relative "foo"
TracePoint.new(:line) do |_tp|
foo
end.enable do
sleep 0
end
res = Coverage.result
puts res[File.expand_path("foo.rb")]
```
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