Memory allocations reported on wrong line for blocks in Ruby 2.6.x

[jturkel]

The following test case reports the allocation of method arguments on different lines for Ruby MRI 2.5/2.7 vs. Ruby MRI 2.6:

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'memory_profiler', '0.9.14'
end

puts "Ruby: #{RUBY_VERSION}"

def do_something
  yield
end

def do_something_else(options)
  yield
end

report = MemoryProfiler.report do
  100_000.times do
    do_something do
      do_something_else({foo: 1, bar: 2, baz: 3}) do
        # no-op
      end
    end
  end
end

report.pretty_print(retained_strings: 0, allocated_strings: 0)

Running this in Ruby 2.5 and 2.7 reports 100,000 allocations on the do_something_else({foo: 1, bar: 2, baz: 3}) line as expected. Ruby 2.6 incorrectly reports the allocations on the do_something line.

[SamSaffron]

Seems super likely you landed on a Ruby regression here that got fixed. Not sure if there is anything we can do here, we get the line numbers directly from MRI.