Testing the My Object Dump and I am trying to cause creation
of a shared string object (ELTS_SHARED...)

I tried:
#!/usr/bin/ruby
#
# Trace Execution
#
#set_trace_func proc { |event, file, line, id, binding, classname|
#   printf "%8s %s:%-2d %10s %8s\n", event, file, line, id, classname }
#
v1 = "hello long message"
v2 = v1.sub(/([aeiou])/, '*')
p v2

But No Luck:

Can someone provide a short fragment that induces this behavior (Shared!).

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GodFather -- 667 Neighbor of the Beast