================
@@ -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
----------------
erichkeane wrote:
I messed with this for a little bit and can't come up with any good way to hit
this with a recoveryexpr/etc, so I think I'm probably ok leaving this as a
'fixme'. I think we could/do better here someday if we can come up with an
example, but nothing I can conceive now.
@a-tarasyuk : feel free to merge this now, and revisit if/when you think of a
good repro here that we can examine/improve.
https://github.com/llvm/llvm-project/pull/115487
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