================
@@ -4692,6 +4692,17 @@ bool Sema::InstantiateDefaultArgument(SourceLocation 
CallLoc, FunctionDecl *FD,
                                       ParmVarDecl *Param) {
   assert(Param->hasUninstantiatedDefaultArg());
 
+  // FIXME: We don't track member specialization info for non-defining
+  // friend declarations, so we will not be able to later find the function
+  // pattern. As a workaround, don't instantiate the default argument in this
+  // case. This is correct per wording and only an error recovery issue, as per
----------------
mizvekov wrote:

The tests for this error recovery issue is already there, it was suggested and 
included in the original PR.
See test case marked with FIXME.

https://github.com/llvm/llvm-project/pull/115487
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