================
@@ -1836,7 +1836,19 @@ static TemplateParameterList
*GetTemplateParameterList(TemplateDecl *TD) {
// Make sure we get the template parameter list from the most
// recent declaration, since that is the only one that is guaranteed to
// have all the default template argument information.
- return cast<TemplateDecl>(TD->getMostRecentDecl())->getTemplateParameters();
+ Decl *ND = TD->getMostRecentDecl();
+ // Skip past friend Decls because they are not supposed to contain default
+ // template arguments. Moreover, these declarations may introduce template
+ // parameters living in different template depths than the corresponding
+ // template parameters in TD, causing unmatched constraint substitution.
+ //
+ // C++23 N4950 [temp.param]p12
----------------
Sirraide wrote:
s/C++14/C++20
My bad, I thought this was a different pr for a second
https://github.com/llvm/llvm-project/pull/86914
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