https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68395
Bug ID: 68395 Summary: [concepts] segfault in valid code Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: ryan.burn at gmail dot com Target Milestone: --- The attached code compiles with an earlier version of gcc-6 but now it segfaults with the following stack trace: bug5.cpp: In instantiation of ‘constexpr const bool htl::detail_concept::mappable_elements’: bug5.cpp:102:26: required from ‘constexpr const bool htl::detail_concept::mappable_impl’ bug5.cpp:159:30: required from here bug5.cpp:88:19: internal compiler error: Segmentation fault std::forward(get(std::forward<TupleForwards>)...); ^ 0xcfb02f crash_signal ../../gcc/gcc/toplev.c:334 0x5fadf5 resolve_args ../../gcc/gcc/cp/call.c:3956 0x612759 build_new_function_call(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool, int) ../../gcc/gcc/cp/call.c:4066 0x7a4cde finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool, bool, int) ../../gcc/gcc/cp/semantics.c:2403 0x677cb4 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../gcc/gcc/cp/pt.c:16420 0x66c7fc tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../gcc/gcc/cp/pt.c:15592 0x843ebb satisfy_expression_constraint ../../gcc/gcc/cp/constraint.cc:1827 0x843ebb satisfy_constraint_1 ../../gcc/gcc/cp/constraint.cc:2001 0x8449f6 satisfy_constraint ../../gcc/gcc/cp/constraint.cc:2049 0x612944 build_new_function_call(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool, int) ../../gcc/gcc/cp/call.c:4135 0x7a4cde finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool, bool, int) ../../gcc/gcc/cp/semantics.c:2403 0x677cb4 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../gcc/gcc/cp/pt.c:16420 0x66c7fc tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../gcc/gcc/cp/pt.c:15592 0x688bd2 gen_elem_of_pack_expansion_instantiation ../../gcc/gcc/cp/pt.c:10493 0x688bd2 tsubst_pack_expansion(tree_node*, tree_node*, int, tree_node*) ../../gcc/gcc/cp/pt.c:10911 0x69174a tsubst_template_args ../../gcc/gcc/cp/pt.c:11014 0x67633e tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../gcc/gcc/cp/pt.c:15778 0x66c7fc tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../gcc/gcc/cp/pt.c:15592 0x6a9c74 regenerate_decl_from_template ../../gcc/gcc/cp/pt.c:21216 0x6a9c74 instantiate_decl(tree_node*, int, bool) ../../gcc/gcc/cp/pt.c:21635 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions.