changyu added a comment.
I don't have commit privilege. And also there's one more problem we might want
to address first.
Thank you.
================
Comment at: lib/Parse/ParseTemplate.cpp:181
+ TemplateParameterList *TPL = ParamLists[0];
+ if (TPL->getLAngleLoc().getLocWithOffset(1) == TPL->getRAngleLoc()) {
+ Diag(TPL->getTemplateLoc(),
----------------
There's one problem here.
I added this `if` in attempt to catch the following case (but it's wrong)
```
template<> concept D1 = true; // expected-error {{expected template
parameter}}
```
The problem is I'm not sure how to differentiate between the above situation
and the following
```
template<concept T> concept D1 = true; // expected-error {{expected
template parameter}}
```
Both have an empty template parameter list. The latter case has diagnostic
printed by `ParseNonTypeTemplateParameter` while the former has not (so we try
to catch it here).
What should we do?
https://reviews.llvm.org/D40381
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