Log by MSP-Greg
Shortened Ruby path

E:\>ruby -vw --disable-gems E:\r_misc\Issues\14361_array_nil_nil.rb

ruby 2.6.0dev (2017-12-31 trunk 61522) [x64-mingw32]
E:/r_misc/Issues/14361_array_nil_nil.rb:10: syntax error, unexpected keyword_nil, expecting ']'
    @a = [nil nil, nil]
              ^~~
E:/r_misc/Issues/14361_array_nil_nil.rb:10: Can't assign to nil
    @a = [nil nil, nil]
                 ^
E:/r_misc/Issues/14361_array_nil_nil.rb:10: Can't assign to nil
    @a = [nil nil, nil]
                      ^
E:/r_misc/Issues/14361_array_nil_nil.rb: [BUG] Segmentation fault
ruby 2.6.0dev (2017-12-31 trunk 61522) [x64-mingw32]

-- Control frame information -----------------------------------------------
c:0001 p:0000 s:0003 E:0022d0 (none) [FINISH]


-- C level backtrace information -------------------------------------------
C:\Windows\SYSTEM32\ntdll.dll(NtWaitForSingleObject+0xa) [0x00000000778f98ea]
C:\Windows\system32\KERNELBASE.dll(WaitForSingleObjectEx+0x9c) [0x000007fefd8910ac]
bin\x64-msvcrt-ruby260.dll(rb_print_backtrace+0x36) [0x000000006a5d4f56]
bin\x64-msvcrt-ruby260.dll(rb_vm_bugreport+0x6d) [0x000000006a5d4fcd]
bin\x64-msvcrt-ruby260.dll(rb_bug_context+0x69) [0x000000006a4a43f9]
bin\x64-msvcrt-ruby260.dll(rb_check_safe_obj+0x6a0) [0x000000006a567630]
 [0x0000000000402487]
C:\Windows\SYSTEM32\ntdll.dll(_C_specific_handler+0x8c) [0x00000000778e7398]
C:\Windows\SYSTEM32\ntdll.dll(_chkstk+0x9d) [0x00000000778fbf9d]
C:\Windows\SYSTEM32\ntdll.dll(RtlInitializeResource+0x53a) [0x00000000778d04ca]
C:\Windows\SYSTEM32\ntdll.dll(KiUserExceptionDispatcher+0x2e) [0x00000000778fb63e]
bin\x64-msvcrt-ruby260.dll(rb_uv_to_utf8+0x50c6) [0x000000006a50ac06]
bin\x64-msvcrt-ruby260.dll(rb_uv_to_utf8+0x5732) [0x000000006a50b272]
bin\x64-msvcrt-ruby260.dll(ruby_yyparse+0x956c) [0x000000006a51acbc]
bin\x64-msvcrt-ruby260.dll(ruby_yyparse+0x115e0) [0x000000006a522d30]
bin\x64-msvcrt-ruby260.dll(rb_suppress_tracing+0xdc) [0x000000006a5d6f6c]
bin\x64-msvcrt-ruby260.dll(rb_parser_compile_file_path+0x6b) [0x000000006a50e51b]
bin\x64-msvcrt-ruby260.dll(ruby_set_script_name+0x13f) [0x000000006a5655ff]
bin\x64-msvcrt-ruby260.dll(rb_ensure+0x16c) [0x000000006a4ab5ec]
bin\x64-msvcrt-ruby260.dll(ruby_set_argv+0xb37) [0x000000006a566617]
bin\x64-msvcrt-ruby260.dll(ruby_process_options+0xbc) [0x000000006a566b5c]
bin\x64-msvcrt-ruby260.dll(ruby_options+0xd5) [0x000000006a4aa085]
 [0x0000000000402dd3]
 [0x00000000004013f7]
 [0x000000000040152b]
C:\Windows\system32\kernel32.dll(BaseThreadInitThunk+0xd) [0x00000000777859cd]

-- Other runtime information -----------------------------------------------

* Loaded script: E:/r_misc/Issues/14361_array_nil_nil.rb

* Loaded features:

    0 enumerator.so
    1 thread.rb
    2 rational.so
    3 complex.so
    4 E:/r_builds/2017-12/26_2017-12-31_61522/ruby26_64/lib/ruby/2.6.0/x64-mingw32/enc/encdb.so
    5 E:/r_builds/2017-12/26_2017-12-31_61522/ruby26_64/lib/ruby/2.6.0/x64-mingw32/enc/trans/transdb.so
    6 E:/r_builds/2017-12/26_2017-12-31_61522/ruby26_64/lib/ruby/2.6.0/x64-mingw32/enc/windows_1252.so