[ruby-dev:50154] [Ruby trunk Bug#13432] set_trace_funcにproc->is_from_method = TRUEのオブジェクトを渡し、SystemStackErrorを発生させるとRubyVMが停止する

From: nobu@...
Date: 2017-06-16 08:12:34 UTC
List: ruby-dev #50154
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