with vim-crystal + syntastic, first alias always says "alias X is already defined" about vim-crystal HOT 1 CLOSED

syntastic: 51.534025: SyntasticMake: called with options: {'errorformat': '%ESyntax error in line %l: %m,%ESyntax error in %f:%l: %m,%EError in %f:%l: %m,%C%p^,%-C%.%#', 'makeprg': 'crystal run --no-codegen --no-color test.cr /home/pt/test.cr'}
syntastic: 51.641999: system: command run in 0.107112s
syntastic: 51.643227: getLocList: checker crystal/crystal returned 1
syntastic: 51.643997: getLocList: checker crystal/crystal run in 0.111502s%

$ crystal run --no-codegen test.cr
$ crystal run --no-codegen test.cr test.cr
Error in ./test.cr:1: alias MyAlias is already defined

alias MyAlias = Int32
^