Hi! Trying to value initialize error_mark_node type ICEs, other spots avoid calling build_value_init* if the type is error_mark_node.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk? 2016-12-02 Jakub Jelinek <ja...@redhat.com> PR c++/78649 * pt.c (tsubst_init): Don't call build_value_init if decl's type is error_mark_node. * g++.dg/cpp0x/pr78649.C: New test. --- gcc/cp/pt.c.jj 2016-11-23 16:58:30.000000000 +0100 +++ gcc/cp/pt.c 2016-12-02 14:38:43.237451068 +0100 @@ -14082,7 +14082,7 @@ tsubst_init (tree init, tree decl, tree init = tsubst_expr (init, args, complain, in_decl, false); - if (!init) + if (!init && TREE_TYPE (decl) != error_mark_node) { /* If we had an initializer but it instantiated to nothing, --- gcc/testsuite/g++.dg/cpp0x/pr78649.C.jj 2016-12-02 14:51:02.057892855 +0100 +++ gcc/testsuite/g++.dg/cpp0x/pr78649.C 2016-12-02 14:50:42.000000000 +0100 @@ -0,0 +1,16 @@ +// PR c++/78649 +// { dg-do compile { target c++11 } } + +template <class> void foo (); +template <class T, class... U> +void +test () +{ + T t (foo<U>...); // { dg-error "declared void" } +} + +int +main () +{ + test<void> (); +} Jakub