[Bug c++/93870] [8/9/10 Regression] User-defined conversion function not working in evaluation of template argument

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93870

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Completely untested:

--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -7082,7 +7082,7 @@ convert_nontype_argument (tree type, tree expr,
tsubst_flags_t complain)
             create a TARGET_EXPR, but in a template we can't
             use AGGR_INIT_EXPR, and the TARGET_EXPR would lead
             to a bogus error.  */
-         || (val_dep_p && MAYBE_CLASS_TYPE_P (type))))
+         || val_dep_p))
        {
          expr = build1 (IMPLICIT_CONV_EXPR, type, expr);
          IMPLICIT_CONV_EXPR_NONTYPE_ARG (expr) = true;