file("close",file()) crashes Scilab 6

Reported by Serge STEER

Originally assigned to Charlotte HECQUET

BUG DESCRIPTION:
----------------
The instruction file("close",file()) which can be used to close all user opened files make Scilab6 crash

ERROR LOG:
----------
[mir2:21051] Signal: Segmentation fault (11)
[mir2:21051] Signal code: Invalid permissions (2)
[mir2:21051] Failing at address: 0x7f47b0080b98
 
Call stack:
   1: 0x914da6 <JVM_handle_linux_signal>        (/home/steer/scilab-6.0.0-alpha-1/thirdparty/java//lib/amd64/server/libjvm.so)
   2: 0x90b6f3 < >                              (/home/steer/scilab-6.0.0-alpha-1/thirdparty/java//lib/amd64/server/libjvm.so)
   3: 0xf890   < >                              (/lib64/libpthread.so.0)
   4: 0xaea83  <cluni0_>                        (/home/steer/scilab-6.0.0-alpha-1/lib/scilab/libscilab-cli.so.0)
   5: 0x1bc1fd <clunit_>                        (/home/steer/scilab-6.0.0-alpha-1/lib/scilab/libscilab-cli.so.0)
   6: 0xb7759  <mclose>                         (/home/steer/scilab-6.0.0-alpha-1/lib/scilab/libscilab-cli.so.0)
   7: 0x336c4e <sci_file(std::vector<types::InternalType*, std::allocator<types::InternalType*> >&, int, std::vector<types::InternalType*, std::allocator<types::InternalType*> >&)> (/home/steer/scilab-6.0.0-alpha-1/lib/scilab/libscilab-cli.so.0)
   8: 0x34d0ac <types::Function::call(std::vector<types::InternalType*, std::allocator<types::InternalType*> >&, std::vector<std::pair<std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >, types::InternalType*>, std::allocator<std::pair<std::ba> (/home/steer/scilab-6.0.0-alpha-1/lib/scilab/libsciast.so.6)
   9: 0x344a77 <types::Callable::invoke(std::vector<types::InternalType*, std::allocator<types::InternalType*> >&, std::vector<std::pair<std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >, types::InternalType*>, std::allocator<std::pair<std::> (/home/steer/scilab-6.0.0-alpha-1/lib/scilab/libsciast.so.6)
  10: 0x163aeb <ast::RunVisitorT<ast::ExecVisitor>::visitprivate(ast::CallExp const&)> (/home/steer/scilab-6.0.0-alpha-1/lib/scilab/libsciast.so.6)
  11: 0x14c8d3 <ast::RunVisitorT<ast::ExecVisitor>::visitprivate(ast::SeqExp const&)> (/home/steer/scilab-6.0.0-alpha-1/lib/scilab/libsciast.so.6)
  12: 0x1c4aed <Runner::launch(void*)>          (/home/steer/scilab-6.0.0-alpha-1/lib/scilab/libscilab-cli.so.0)


HOW TO REPRODUCE THE BUG:
-------------------------
Start Scilab6 and execute 

file("close",file())

OTHER INFORMATION:
------------------

file("close",file()) crashes Scilab 6

Reported by Serge STEER

Originally assigned to Charlotte HECQUET

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