https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96330
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Tried --- gcc/cp/pt.c.jj 2020-07-27 10:38:19.000000000 +0200 +++ gcc/cp/pt.c 2020-07-27 17:25:09.748240198 +0200 @@ -16838,14 +16838,17 @@ tsubst_copy (tree t, tree args, tsubst_f case TEMPLATE_ID_EXPR: { /* Substituted template arguments */ - tree fn = TREE_OPERAND (t, 0); + tree expr = TREE_OPERAND (t, 0); tree targs = TREE_OPERAND (t, 1); - fn = tsubst_copy (fn, args, complain, in_decl); + expr = tsubst_copy (expr, args, complain, in_decl); if (targs) targs = tsubst_template_args (targs, args, complain, in_decl); - return lookup_template_function (fn, targs); + if (variable_template_p (expr)) + return lookup_and_finish_template_variable (expr, targs, complain); + else + return lookup_template_function (expr, targs); } case TREE_LIST: but that just means an ICE elsewhere.