RSpec Tracing not working

[ericgross]

I am trying to trace allocations in my rspec test run so I have added the following to my rails_helper.rb (at the top:

require 'allocation_stats'
AllocationStats.trace_rspec

And all my my specs fail with this:

     Failure/Error: AllocationStats.add_to_top_sites(allocations.all, @example.location)

     NoMethodError:
       undefined method `location' for nil:NilClass
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/allocation_stats-0.1.5/lib/allocation_stats/trace_rspec.rb:45:in `block in <class:AllocationStats>'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:425:in `instance_exec'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:425:in `instance_exec'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:389:in `execute_with'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:620:in `block (2 levels) in run_around_example_hooks_for'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:320:in `call'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-retry-0.4.5/lib/rspec/retry.rb:98:in `block in run'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-retry-0.4.5/lib/rspec/retry.rb:88:in `loop'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-retry-0.4.5/lib/rspec/retry.rb:88:in `run'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-retry-0.4.5/lib/rspec_ext/rspec_ext.rb:12:in `run_with_retry'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-retry-0.4.5/lib/rspec/retry.rb:22:in `block (2 levels) in setup'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:425:in `instance_exec'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:425:in `instance_exec'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:389:in `execute_with'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:620:in `block (2 levels) in run_around_example_hooks_for'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:320:in `call'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:621:in `run_around_example_hooks_for'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:478:in `run'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:435:in `with_around_example_hooks'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:478:in `with_around_and_singleton_context_hooks'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:233:in `run'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example_group.rb:581:in `block in run_examples'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example_group.rb:577:in `map'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example_group.rb:577:in `run_examples'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/example_group.rb:543:in `run'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:119:in `block (3 levels) in run_specs'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:119:in `map'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:119:in `block (2 levels) in run_specs'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/configuration.rb:1680:in `with_suite_hooks'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:118:in `block in run_specs'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/reporter.rb:77:in `report'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:117:in `run_specs'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:93:in `run'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:78:in `run'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:45:in `invoke'
     # /Users/eric/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rspec-core-3.4.4/exe/rspec:4:in `<top (required)>'
     # /Users/eric/.rbenv/versions/2.3.0/bin/rspec:23:in `load'
     # /Users/eric/.rbenv/versions/2.3.0/bin/rspec:23:in `<main>'
     # 
     #   Showing full backtrace because every line was filtered out.
     #   See docs for RSpec::Configuration#backtrace_exclusion_patterns and
     #   RSpec::Configuration#backtrace_inclusion_patterns for more information.

Any suggestions?

[maltoe]

Try replacing all the @example references in the block at trace_rspec.rb:45 and around with the block param example. Worked for me.