[ruby-core:74934] [Ruby trunk Bug#12278] Sometimes I have segmentation fault with props reducer

Issue #12278 has been reported by Gleb Averchuk.

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Bug #12278: Sometimes I have segmentation fault with props reducer
https://bugs.ruby-lang.org/issues/12278

* Author: Gleb Averchuk
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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Hello,

Sometimes I have segmentation fault for code like:

~~~
  # /Users/newmen/projects/versatile-diamond/analyzer/lib/modules/procs_reducer.rb:35

  8 # Combines passed procs to one function
  9 # @param [Array] procs which will be combined
 10 # @yield returns heart of combination result
 11 # @return [Proc] the general function which contains calls of all other nested
 12 def reduce_procs(procs, &deepest_block)
 13   procs.reverse.reduce(deepest_block) do |acc, block|
 14     -> { block[&acc] }
 15   end
 16 end
 17
 18 # Calls combined procs as one function
 19 # @param [Array] procs which will be combined
 20 # @yield returns heart of combination result
 21 # @return [Object]
 22 def call_procs(procs, &block)
 23   reduce_procs(procs, &block).call
 24 end
 25
 26 # Collects procs which nests each other, after than calls combined procedure
 27 # @param [Proc] deepest_block the block for the deepest call
 28 # @yield [Symbol, Array, Hash] nests the some method call
 29 # @return [Object] the result of deepest block call
 30 def inlay_procs(deepest_block, &block)
 31   procs = []
 32   nest = -> method_name, *args, **kwargs do
 33     procs <<
 34       if kwargs.empty?
 35         -> &prc { send(method_name, *args, &prc) }
 36       else
 37         -> &prc { send(method_name, *args, **kwargs, &prc) }
 38       end
 39   end
 40
 41   block[nest]
 42   call_procs(procs, &deepest_block)
 43 end
~~~

Console report and crash log files are attached.
Both attached source files were written about 2 years ago.

---Files--------------------------------
report.log (107 KB)
ruby_2016-04-13-205136_primemind.crash (27.4 KB)
procs_reducer.rb (1.44 KB)
minuend_spec.rb (5.43 KB)


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