faisalv added a subscriber: Nate. ================ Comment at: include/clang/AST/DeclTemplate.h:836 @@ -835,2 +835,3 @@ + bool IsConcept : 1; protected: ---------------- rsmith wrote: > This might make more sense on `TemplateDecl`, since we also want this flag > for `VarTemplateDecl`s. In any case, please use some existing spare bit for > this rather than making all `FunctionTemplateDecl`s 8 bytes larger by putting > it here. @Nate - since you asked before, if I was to try and do this (now that we know Richard cares strongly about the extra space), I would probably risk complexity (and insult readability) by attempting to smuggle the extra bit into RedeclararableTemplateDecl::CommonBase::InstantiatedFromMember or perhaps within the low bits of the pointer to ReDeclarableTemplateDecl::CommonBase itself (i.e. Common) Let's see if Richard has a preference - or suggests a completely different strategy for squirreling.
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