tahonermann added a comment.

I wonder if I'm reading (temp.friend)p9` sentence 2 
<http://eel.is/c++draft/temp.friend#9.sentence-2> correctly. Which of these 
should it be parsed as?
1. A (friend function template with a constraint) that depends on a template 
parameter from an enclosing template shall be a definition.
2. A friend function template (with a constraint that depends on a template 
parameter from an enclosing template) shall be a definition.

I'm guessing that the first interpretation is the intent.


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