[Bug c++/96465] New: ICE in tsubst_function_decl, at cp/pt.c:13669

[Bug c++/96465] New: ICE in tsubst_function_decl, at cp/pt.c:13669

[haoxintu at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96465

            Bug ID: 96465
           Summary: ICE in tsubst_function_decl, at cp/pt.c:13669
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: error-recovery, ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: haoxintu at gmail dot com
  Target Milestone: ---

Hi, all.

This code, similar with bug 96464 code, makes GCC-7.1 onwards versions ICE or
"confused by earlier errors". It seems that GCC have some room to enhance its
error-recovery on this case.

Input
//small.cc
void foo(){
    auto var = [] (class b<auto>...) {};
}

Command:
g++ small.cc

Output:
small.cc: In function ‘void foo()’:
small.cc:2:26: error: ‘b’ is not a class template
    2 |     auto var = [] (class b<auto>...) {};
      |                          ^
small.cc:1:6: internal compiler error: in tsubst_function_decl, at
cp/pt.c:13669
    1 | void foo(){
      |      ^~~
0x66004a tsubst_function_decl
        ../../gcc/cp/pt.c:13669
0xa00832 tsubst_decl
        ../../gcc/cp/pt.c:14216
0xa0c74f lookup_template_class_1
        ../../gcc/cp/pt.c:9852
0xa0e813 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
        ../../gcc/cp/pt.c:10139
0xa0e813 tsubst_aggr_type
        ../../gcc/cp/pt.c:13395
0x9c94ef cp_parser_parameter_declaration
        ../../gcc/cp/parser.c:22961
0x9c9a82 cp_parser_parameter_declaration_list
        ../../gcc/cp/parser.c:22681
0x9c9e81 cp_parser_parameter_declaration_clause
        ../../gcc/cp/parser.c:22608
0x9ca993 cp_parser_lambda_declarator_opt
        ../../gcc/cp/parser.c:11134
0x9b0831 cp_parser_lambda_expression
        ../../gcc/cp/parser.c:10665
0x9b18b0 cp_parser_primary_expression
        ../../gcc/cp/parser.c:5475
0x9bbdd5 cp_parser_postfix_expression
        ../../gcc/cp/parser.c:7328
0x99daaa cp_parser_binary_expression
        ../../gcc/cp/parser.c:9641
0x99f83e cp_parser_assignment_expression
        ../../gcc/cp/parser.c:9946
0x99e3bd cp_parser_constant_expression
        ../../gcc/cp/parser.c:10240
0x99ebe1 cp_parser_initializer_clause
        ../../gcc/cp/parser.c:23312
0x9a391c cp_parser_initializer
        ../../gcc/cp/parser.c:23250
0x9cc4ab cp_parser_init_declarator
        ../../gcc/cp/parser.c:20943
0x9ac3cc cp_parser_simple_declaration
        ../../gcc/cp/parser.c:13811
0x9ae42d cp_parser_declaration_statement
        ../../gcc/cp/parser.c:13249
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

My GCC version is
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/home/haoxin/corpus-compilers/gcc-trunk/gcc-master/build/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure
--prefix=/home/haoxin/corpus-compilers/gcc-trunk/gcc-master/build/
--enable-languages=c,c++ CC=gcc CXX=g++
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20200801 (experimental) (GCC) 


Thanks,
Haoxin

[Bug c++/96465] ICE in tsubst_function_decl, at cp/pt.c:13669

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96465

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4
   Last reconfirmed|                            |2020-08-04
                 CC|                            |mpolacek at gcc dot gnu.org
   Target Milestone|---                         |8.5
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.

[Bug c++/96465] [9/10/11/12 Regression] ICE in tsubst_function_decl, at cp/pt.c:13669

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96465

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|8.5                         |9.4

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8 branch is being closed.

[Bug c++/96465] [9/10/11/12 Regression] ICE in tsubst_function_decl, at cp/pt.c:13669

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96465

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.4                         |9.5

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9.4 is being released, retargeting bugs to GCC 9.5.

[Bug c++/96465] [10/11/12/13 Regression] ICE in tsubst_function_decl, at cp/pt.c:13669

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96465

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.5                         |10.4

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9 branch is being closed

[Bug c++/96465] [10/11/12/13 Regression] ICE in tsubst_function_decl, at cp/pt.c:13669

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96465

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.4                        |10.5

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 10.4 is being released, retargeting bugs to GCC 10.5.

[Bug c++/96465] [11/12/13/14 Regression] ICE in tsubst_function_decl, at cp/pt.c:13669

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96465

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.5                        |11.5

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 10 branch is being closed.