https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85076
Bug ID: 85076
Summary: [6/7/8 Regression] ICE with invalid template used as
lambda argument
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 triggers an ICE since GCC 6.2.0:
==================================
template<typename> struct A*;
auto a = [](A<auto>) {};
==================================
bug.cc:1:29: error: expected unqualified-id before ';' token
template<typename> struct A*;
^
bug.cc:3:13: error: 'A' is not a template
auto a = [](A<auto>) {};
^
bug.cc:3:13: error: '<anonymous>' has incomplete type
auto a = [](A<auto>) {};
^~~~~~~
bug.cc:1:27: note: forward declaration of 'struct A'
template<typename> struct A*;
^
bug.cc:3:23: internal compiler error: tree check: expected reference_type, have
error_mark in cp_build_reference_type, at cp/tree.c:1099
auto a = [](A<auto>) {};
^
0x78c502 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
../../gcc/gcc/tree.c:9322
0x664299 tree_check(tree_node*, char const*, int, char const*, tree_code)
../../gcc/gcc/tree.h:3135
0x664299 cp_build_reference_type(tree_node*, bool)
../../gcc/gcc/cp/tree.c:1099
0x8f4696 forward_parm(tree_node*)
../../gcc/gcc/cp/method.c:472
0x8dd6be maybe_add_lambda_conv_op(tree_node*)
../../gcc/gcc/cp/lambda.c:1125
0x924fc2 cp_parser_lambda_expression
../../gcc/gcc/cp/parser.c:10201
0x924fc2 cp_parser_primary_expression
../../gcc/gcc/cp/parser.c:5263
0x937c0c cp_parser_postfix_expression
../../gcc/gcc/cp/parser.c:7032
0x9387e0 cp_parser_unary_expression
../../gcc/gcc/cp/parser.c:8324
0x9186df cp_parser_cast_expression
../../gcc/gcc/cp/parser.c:9092
0x918eea cp_parser_binary_expression
../../gcc/gcc/cp/parser.c:9193
0x91a724 cp_parser_assignment_expression
../../gcc/gcc/cp/parser.c:9488
0x91987b cp_parser_constant_expression
../../gcc/gcc/cp/parser.c:9772
0x91a6a7 cp_parser_initializer_clause
../../gcc/gcc/cp/parser.c:21929
0x91cf62 cp_parser_initializer
../../gcc/gcc/cp/parser.c:21869
0x93c3ae cp_parser_init_declarator
../../gcc/gcc/cp/parser.c:19684
0x943758 cp_parser_simple_declaration
../../gcc/gcc/cp/parser.c:13059
0x944568 cp_parser_block_declaration
../../gcc/gcc/cp/parser.c:12884
0x9484c2 cp_parser_declaration
../../gcc/gcc/cp/parser.c:12782
0x9488d1 cp_parser_declaration_seq_opt
../../gcc/gcc/cp/parser.c:12658
Please submit a full bug report, [etc.]
