[llvm-bugs] [Bug 46788] New: Anonymous struct members initialized with designated initializers

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46788

            Bug ID: 46788
           Summary: Anonymous struct members initialized with designated
                    initializers
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: piovezan.fpi at gmail.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

The following code fails to compile: 

```
struct State {
  struct {
    int anon_struct_member;
  };
};

template <int VAL> void init() {
  State mystruct = {
      .anon_struct_member = VAL,
  };
}

void foo() { init<1>(); }
```

The error message:

error: field designator (null) does not refer to any field in type 'State'

https://godbolt.org/z/16Gz7G

Anonymous struct members is an extension that doesn't seem to play well with
template parameters. If you declare a local variable `constexpr auto val_local
= VAL` and use that instead in the struct initializer, the code compiles.

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