Disallow to use TypeGuard type outside of .ret_type, refs #11765
#11790
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Now TypeGuard is required to be in the function's return type position. In other places it is just a
booltype. But, we start to raise an error.To be honest, PEP does not mention this, but I think that it is a reasonable thing to do.
Closes #11765
CC @erictraut