.....................................................................................................
.......Invalid memory access (signal 11) at address 0x40
[0xaab2f9c880e0] *CallStack::print_backtrace:Int32 +100
[0xaab2f969fb74] __crystal_sigfault_handler +228
[0xfff613bbe964] __setjmp +56
[0xfff613a33170] xmlTextReaderReadOuterXml +20
[0xaab2facf9dbc] *XML::Reader#read_outer_xml:String +24
[0xaab2f9c43b90] ~procProc(Nil) +44
[0xaab2f96c241c] *it<String, String, Int32, Int32, &Proc(Nil)>:(Array(Spec::Result) | Nil) +580
[0xaab2f9c43b54] ~procProc(Nil) +72
[0xaab2f9e1a3a0] *Spec::RootContext::describe<String, String, Int32, &Proc(Nil)>:Spec::Context+ +316
[0xaab2f96c7834] *describe<String, String, Int32, &Proc(Nil)>:Spec::Context+ +8
[0xaab2f9c3d420] ~procProc(Nil) +1024
[0xaab2f9e1a3a0] *Spec::RootContext::describe<String, String, Int32, &Proc(Nil)>:Spec::Context+ +316
[0xaab2f9c44644] *describe<XML::Reader.class, String, Int32, &Proc(Nil)>:Spec::Context+ +48
[0xaab2f968623c] __crystal_main +37812
[0xaab2fa6f3984] *Crystal::main_user_code<Int32, Pointer(Pointer(UInt8))>:Nil +8
[0xaab2fa6f38dc] *Crystal::main<Int32, Pointer(Pointer(UInt8))>:Int32 +40
[0xaab2f968d624] main +8
[0xfff613b93734] ???
make: *** [Makefile:86: spec] Error 11
>>> ERROR: crystal: check failed