object_space/gc_latest_info_no_parens.rb

tests/_examples/object_space/gc_latest_info_no_parens.rb in the metorex repository.

# GC.latest_gc_info reports the collector's last run: every reading in a new
# Hash, every reading added to a Hash given, or one reading by name. A run
# metorex makes is one the program asked for.
p GC.latest_gc_info.keys
GC.start
p GC.latest_gc_info
held = { kept: true }
p GC.latest_gc_info(held).equal? held
p held.size
p [GC.latest_gc_info(:gc_by), GC.latest_gc_info(:state)]
begin
  GC.latest_gc_info :unknown
rescue ArgumentError => error
  puts error.message
end
begin
  GC.latest_gc_info "state"
rescue TypeError => error
  puts error.message
end

Output:

[:major_by, :need_major_by, :gc_by, :have_finalizer, :immediate_sweep, :state, :weak_references_count]
{major_by: :force, need_major_by: nil, gc_by: :method, have_finalizer: false, immediate_sweep: true, state: :none, weak_references_count: 0}
true
8
[:method, :none]
unknown key: unknown
non-hash or symbol given