https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94128
Bug ID: 94128 Summary: ICE on C++20 "requires requires" with lambda Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: bisqwit at iki dot fi Target Milestone: --- For this code: void test(auto param) requires requires{ { [](auto p){return p;}(param) }; }; void test2() { test(1); } On this compiler: g++-10 (Debian 10-20200222-1) 10.0.1 20200222 (experimental) [master revision 01af7e0a0c2:487fe13f218:e99b18cf7101f205bfdd9f0f29ed51caaec52779] Compiling with this commandline: g++-10 -v tmp.cc -std=c++20 We get: Using built-in specs. COLLECT_GCC=g++-10 COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/10/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa:hsa OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 10-20200222-1' --with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs --enable-languages=c,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-10 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none,amdgcn-amdhsa,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 10.0.1 20200222 (experimental) [master revision 01af7e0a0c2:487fe13f218:e99b18cf7101f205bfdd9f0f29ed51caaec52779] (Debian 10-20200222-1) COLLECT_GCC_OPTIONS='-v' '-std=c++2a' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/10/cc1plus -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE tmp.cc -quiet -dumpbase tmp.cc -mtune=generic -march=x86-64 -auxbase tmp -std=c++2a -version -fasynchronous-unwind-tables -o /tmp/cc8CWcEJ.s GNU C++17 (Debian 10-20200222-1) version 10.0.1 20200222 (experimental) [master revision 01af7e0a0c2:487fe13f218:e99b18cf7101f205bfdd9f0f29ed51caaec52779] (x86_64-linux-gnu) compiled by GNU C version 10.0.1 20200222 (experimental) [master revision 01af7e0a0c2:487fe13f218:e99b18cf7101f205bfdd9f0f29ed51caaec52779], GMP version 6.2.0, MPFR version 4.0.2, MPC version 1.1.0, isl version isl-0.22-GMP warning: GMP header version 6.2.0 differs from library version 6.1.2. GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/10" ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu" ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/include/c++/10 /usr/include/x86_64-linux-gnu/c++/10 /usr/include/c++/10/backward /usr/lib/gcc/x86_64-linux-gnu/10/include /usr/local/include /usr/lib/gcc/x86_64-linux-gnu/10/include-fixed /usr/include/x86_64-linux-gnu /usr/include End of search list. GNU C++17 (Debian 10-20200222-1) version 10.0.1 20200222 (experimental) [master revision 01af7e0a0c2:487fe13f218:e99b18cf7101f205bfdd9f0f29ed51caaec52779] (x86_64-linux-gnu) compiled by GNU C version 10.0.1 20200222 (experimental) [master revision 01af7e0a0c2:487fe13f218:e99b18cf7101f205bfdd9f0f29ed51caaec52779], GMP version 6.2.0, MPFR version 4.0.2, MPC version 1.1.0, isl version isl-0.22-GMP warning: GMP header version 6.2.0 differs from library version 6.1.2. GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: f533434f622c23e753fbd5b6135ebdd3 tmp.cc: In instantiation of ‘void test(auto:1) requires requires{{(<lambda>)(test::param)};} [with auto:1 = int]’: tmp.cc:3:22: required from here tmp.cc:2:26: internal compiler error: Segmentation fault 2 | requires requires{ { [](auto p){return p;}(param) }; }; | ^~~~~~~~~~~~~~~~~~~~~ 0xc248ef crash_signal ../../src/gcc/toplev.c:328 0x7fb53dd2d0ff ??? /build/glibc-kSJANG/glibc-2.29/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0 0x733be8 tsubst_template_args(tree_node*, tree_node*, int, tree_node*) ../../src/gcc/cp/pt.c:13090 0x738602 tsubst_function_decl ../../src/gcc/cp/pt.c:13501 0x738e38 tsubst_template_decl ../../src/gcc/cp/pt.c:13894 0x72a95e tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*) ../../src/gcc/cp/pt.c:18862 0x72d085 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../src/gcc/cp/pt.c:20304 0x72be2c tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../src/gcc/cp/pt.c:18962 0x72be2c tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../src/gcc/cp/pt.c:19559 0x7250a4 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../src/gcc/cp/pt.c:18962 0x7250a4 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../src/gcc/cp/pt.c:18597 0x648a39 tsubst_requires_expr(tree_node*, tree_node*, int, tree_node*) ../../src/gcc/cp/constraint.cc:1866 0x72c7f4 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../src/gcc/cp/pt.c:20336 0x7250a4 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../src/gcc/cp/pt.c:18962 0x7250a4 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../src/gcc/cp/pt.c:18597 0x648082 satisfy_constraint_r ../../src/gcc/cp/constraint.cc:2523 0x6487e8 satisfy_constraint ../../src/gcc/cp/constraint.cc:2599 0x649184 satisfy_declaration_constraints ../../src/gcc/cp/constraint.cc:2617 0x649c68 constraint_satisfaction_value ../../src/gcc/cp/constraint.cc:2733 0x649c68 constraints_satisfied_p(tree_node*) ../../src/gcc/cp/constraint.cc:2754 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <file:///usr/share/doc/gcc-10/README.Bugs> for instructions.