https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85210
Bug ID: 85210
Summary: ICE with broken structured binding in template
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: error-recovery, ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: reichelt at gcc dot gnu.org
Target Milestone: ---
The following invalid code snippet (compiled with "-std=c++1z") triggers
an ICE since GCC 7.1.0 (structured bindings were introduced):
============================
struct A { int i; };
template<int> void foo(int j)
{
auto [j] = A{j};
}
void bar()
{
foo<0>(0);
}
============================
bug.cc: In function 'void foo(int)':
bug.cc:5:10: error: declaration of 'auto j' shadows a parameter
auto [j] = A{j};
^
bug.cc: In instantiation of 'void foo(int) [with int <anonymous> = 0]':
bug.cc:10:11: required from here
bug.cc:5:8: internal compiler error: in fit_decomposition_lang_decl, at
cp/lex.c:724
auto [j] = A{j};
^~~
0x61802a fit_decomposition_lang_decl(tree_node*, tree_node*)
../../gcc/gcc/cp/lex.c:724
0x8a2868 cp_finish_decomp(tree_node*, tree_node*, unsigned int)
../../gcc/gcc/cp/decl.c:7545
0x9746fd tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16409
0x96f15f tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16561
0x96e2f8 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16249
0x96e2f8 instantiate_decl(tree_node*, bool, bool)
../../gcc/gcc/cp/pt.c:23659
0x9932db instantiate_pending_templates(int)
../../gcc/gcc/cp/pt.c:23775
0x8b893b c_parse_final_cleanups()
../../gcc/gcc/cp/decl2.c:4724
Please submit a full bug report, [etc.]
