Linking error when changing > to >>

In my project I found an example, where I get an linking error, when I change
the expectation operator > to the "followed-by" operator >>.
I tried to isolate this behaviour in this repo
https://github.com/bitwalda/linker_error_example
<https://github.com/bitwalda/linker_error_example>  
In the file example_def.hpp where I added a comment, when we change > type
to >> type, or something around the type parser from > to >> I get an linker
error.
So I think it has something to do with the type parser.
Maybe I did something wrong, please correct me if I did anything anywhere in
this example I shouldnt do when using boost spirit x3.
I spoke to Joel before to ask whether I could expect such a behaviour in
spirit x3 and he said no, so I think this is a bug.

Greetings Exagon



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