microsoft / microsoft/vscode-cpptools

Incorrect Intellisense error "a constexpr function cannot have a nonliteral return type" when returning struct containing optional<string> (C++20)

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Description

Environment
  • OS and Version: Linux Ubuntu 20.04
  • VS Code Version: 1.87.0
  • C/C++ Extension Version: v1.19.6
    Not using SSH remote.
Bug Summary and Steps to Reproduce

Bug Summary:
In the C++20 code below, an incorrect Intellisense error is flagged on the operator, when compilation succeeds.

Steps to reproduce:

  1. Create a new directory and copy the lines below into a new file, "main.cpp". Save the file.
  2. Enter the directory and start VSCode with "code .".
  3. Set the C/C++ extension's C++ standard to "c++20" (command: C/C++: Edit configurations (UI)).
  4. The error message is flagged on the word "operator" in the main.cpp file.

Expected behavior:

Expected no error message. The code compiles without warnings using "gcc --std=c++20 main.cpp".

#include <optional>
#include <string>

struct TestClass { std::optional<std::string> opt; };

constexpr TestClass operator""_xxx(char const *str, size_t length) { return TestClass{}; }

int main() { return 0; }
Configuration and Logs
{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/**"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "c17",
            "cppStandard": "c++20",
            "intelliSenseMode": "linux-gcc-x64"
        }
    ],
    "version": 4
}

-------- Diagnostics - 07/03/2024, 11:34:36
Version: 1.19.6
Current Configuration:
{
    "name": "Linux",
    "includePath": [
        "/home/savoie/intellibug/**"
    ],
    "defines": [],
    "compilerPath": "/usr/bin/gcc",
    "cStandard": "c17",
    "cppStandard": "c++20",
    "intelliSenseMode": "linux-gcc-x64",
    "compilerPathIsExplicit": true,
    "cStandardIsExplicit": true,
    "cppStandardIsExplicit": true,
    "intelliSenseModeIsExplicit": true,
    "compilerPathInCppPropertiesJson": "/usr/bin/gcc",
    "mergeConfigurations": false,
    "browse": {
        "path": [
            "/home/savoie/intellibug/**",
            "${workspaceFolder}"
        ],
        "limitSymbolsToIncludedHeaders": true
    }
}
cpptools version (native): 1.19.6.0
Translation Unit Mappings:
[ /home/savoie/intellibug/main.cpp - source TU]:
Translation Unit Configurations:
[ /home/savoie/intellibug/main.cpp ]:
    Process ID: 18176
    Memory Usage: 72 MB
    Compiler Path: /usr/bin/gcc
    Includes:
        /usr/include/c++/12
        /usr/include/x86_64-linux-gnu/c++/12
        /usr/include/c++/12/backward
        /usr/lib/gcc/x86_64-linux-gnu/12/include
        /usr/local/include
        /usr/include/x86_64-linux-gnu
        /usr/include
    Standard Version: c++20
    IntelliSense Mode: linux-gcc-x64
    Other Flags:
        --g++
        --gnu_version=120300
Total Memory Usage: 72 MB

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 4510
Number of files parsed: 937



Intellisense update pending for: file:///home/savoie/intellibug/main.cpp
LSP: (received) cpptools/didChangeActiveEditor: file:///home/savoie/intellibug/main.cpp
LSP: (received) cpptools/getCodeActions: file:///home/savoie/intellibug/main.cpp (id: 1230)
LSP: (invoked) cpptools/didChangeActiveEditor: file:///home/savoie/intellibug/main.cpp
LSP: (invoked) cpptools/getCodeActions: file:///home/savoie/intellibug/main.cpp (id: 1230)
LSP: (received) cpptools/didChangeTextEditorSelection
LSP: Sending response (id: 1230)
LSP: (invoked) cpptools/didChangeTextEditorSelection
IntelliSense update scheduled and TU acquisition started for: file:///home/savoie/intellibug/main.cpp
Update IntelliSense time (sec): 0.007
LSP: (received) cpptools/getFoldingRanges: file:///home/savoie/intellibug/main.cpp (id: 1231)
LSP: (received) cpptools/getDocumentSymbols: file:///home/savoie/intellibug/main.cpp (id: 1232)
LSP: (invoked) cpptools/getFoldingRanges: file:///home/savoie/intellibug/main.cpp (id: 1231)
LSP: (invoked) cpptools/getDocumentSymbols: file:///home/savoie/intellibug/main.cpp (id: 1232)
LSP: Sending response (id: 1231)
LSP: Sending response (id: 1232)
LSP: (received) cpptools/restartIntelliSenseForFile: file:///home/savoie/intellibug/main.cpp
LSP: (invoked) cpptools/restartIntelliSenseForFile: file:///home/savoie/intellibug/main.cpp
Shutting down IntelliSense server: /home/savoie/intellibug/main.cpp
Intellisense update pending for: file:///home/savoie/intellibug/main.cpp
IntelliSense update scheduled and TU acquisition started for: file:///home/savoie/intellibug/main.cpp
Populating file name cache...
Done populating filename cache. Elapsed time: 3 ms
Resolving recursive includes...
Done resolving recursive includes.
sending compilation args for /home/savoie/intellibug/main.cpp
  include: /usr/include/c++/12
  include: /usr/include/x86_64-linux-gnu/c++/12
  include: /usr/include/c++/12/backward
  include: /usr/lib/gcc/x86_64-linux-gnu/12/include
  include: /usr/local/include
  include: /usr/include/x86_64-linux-gnu
  include: /usr/include
  define: __SSP_STRONG__=3
  define: __DBL_MIN_EXP__=(-1021)
  define: __UINT_LEAST16_MAX__=0xffff
  define: __FLT16_HAS_QUIET_NAN__=1
  define: __ATOMIC_ACQUIRE=2
  define: __FLT128_MAX_10_EXP__=4932
  define: __FLT_MIN__=1.17549435082228750796873653722224568e-38F
  define: __GCC_IEC_559_COMPLEX=2
  define: __UINT_LEAST8_TYPE__=unsigned char
  define: __SIZEOF_FLOAT80__=16
  define: __INTMAX_C(c)=c ## L
  define: __CHAR_BIT__=8
  define: __UINT8_MAX__=0xff
  define: __SCHAR_WIDTH__=8
  define: __WINT_MAX__=0xffffffffU
  define: __FLT32_MIN_EXP__=(-125)
  define: __ORDER_LITTLE_ENDIAN__=1234
  define: __SIZE_MAX__=0xffffffffffffffffUL
  define: __WCHAR_MAX__=0x7fffffff
  define: __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2=1
  define: __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4=1
  define: __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8=1
  define: __GCC_ATOMIC_CHAR_LOCK_FREE=2
  define: __GCC_IEC_559=2
  define: __FLT32X_DECIMAL_DIG__=17
  define: __FLT_EVAL_METHOD__=0
  define: __FLT64_DECIMAL_DIG__=17
  define: __CET__=3
  define: __GCC_ATOMIC_CHAR32_T_LOCK_FREE=2
  define: __UINT_FAST64_MAX__=0xffffffffffffffffUL
  define: __SIG_ATOMIC_TYPE__=int
  define: __DBL_MIN_10_EXP__=(-307)
  define: __FINITE_MATH_ONLY__=0
  define: __FLT32X_MAX_EXP__=1024
  define: __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1=1
  define: __FLT32_HAS_DENORM__=1
  define: __UINT_FAST8_MAX__=0xff
  define: __DEC64_MAX_EXP__=385
  define: __INT8_C(c)=c
  define: __INT_LEAST8_WIDTH__=8
  define: __UINT_LEAST64_MAX__=0xffffffffffffffffUL
  define: __INT_LEAST8_MAX__=0x7f
  define: __SHRT_MAX__=0x7fff
  define: __LDBL_MAX__=1.18973149535723176502126385303097021e+4932L
  define: __FLT64X_MAX_10_EXP__=4932
  define: __LDBL_IS_IEC_60559__=2
  define: __FLT64X_HAS_QUIET_NAN__=1
  define: __UINT_LEAST8_MAX__=0xff
  define: __GCC_ATOMIC_BOOL_LOCK_FREE=2
  define: __FLT128_DENORM_MIN__=6.47517511943802511092443895822764655e-4966F128
  define: __UINTMAX_TYPE__=long unsigned int
  define: __linux=1
  define: __DEC32_EPSILON__=1E-6DF
  define: __FLT_EVAL_METHOD_TS_18661_3__=0
  define: __unix=1
  define: __UINT32_MAX__=0xffffffffU
  define: __GXX_EXPERIMENTAL_CXX0X__=1
  define: __DBL_DENORM_MIN__=double(4.94065645841246544176568792868221372e-324L)
  define: __FLT128_MIN_EXP__=(-16381)
  define: __WINT_MIN__=0U
  define: __FLT128_MIN_10_EXP__=(-4931)
  define: __FLT32X_IS_IEC_60559__=2
  define: __INT_LEAST16_WIDTH__=16
  define: __SCHAR_MAX__=0x7f
  define: __FLT128_MANT_DIG__=113
  define: __WCHAR_MIN__=(-__WCHAR_MAX__ - 1)
  define: __INT64_C(c)=c ## L
  define: __GCC_ATOMIC_POINTER_LOCK_FREE=2
  define: __FLT32X_MANT_DIG__=53
  define: __GCC_ATOMIC_CHAR16_T_LOCK_FREE=2
  define: __FLT32_MAX_10_EXP__=38
  define: __FLT64X_EPSILON__=1.08420217248550443400745280086994171e-19F64x
  define: __STDC_HOSTED__=1
  define: __DEC64_MIN_EXP__=(-382)
  define: __DBL_DIG__=15
  define: __FLT32_DIG__=6
  define: __FLT_EPSILON__=1.19209289550781250000000000000000000e-7F
  define: __GXX_WEAK__=1
  define: __SHRT_WIDTH__=16
  define: __FLT32_IS_IEC_60559__=2
  define: __LDBL_MIN__=3.36210314311209350626267781732175260e-4932L
  define: __DBL_IS_IEC_60559__=2
  define: __DEC32_MAX__=9.999999E96DF
  define: __CHAR8_TYPE__=unsigned char
  define: __FLT64X_DENORM_MIN__=3.64519953188247460252840593361941982e-4951F64x
  define: __FLT32X_HAS_INFINITY__=1
  define: __INT32_MAX__=0x7fffffff
  define: __FLT16_DIG__=3
  define: __unix__=1
  define: __INT_WIDTH__=32
  define: __SIZEOF_LONG__=8
  define: __STDC_IEC_559__=1
  define: __STDC_ISO_10646__=201706L
  define: __UINT16_C(c)=c
  define: __DECIMAL_DIG__=21
  define: __STDC_IEC_559_COMPLEX__=1
  define: __FLT64_EPSILON__=2.22044604925031308084726333618164062e-16F64
  define: __gnu_linux__=1
  define: __INT16_MAX__=0x7fff
  define: __FLT64_MIN_EXP__=(-1021)
  define: __FLT64X_MIN_10_EXP__=(-4931)
  define: __LDBL_HAS_QUIET_NAN__=1
  define: __FLT16_MIN_EXP__=(-13)
  define: __FLT64_MANT_DIG__=53
  define: __FLT64X_MANT_DIG__=64
  define: __GNUC__=12
  define: __GXX_RTTI=1
  define: __pie__=2
  define: __MMX__=1
  define: __FLT_HAS_DENORM__=1
  define: __SIZEOF_LONG_DOUBLE__=16
  define: __BIGGEST_ALIGNMENT__=16
  define: __STDC_UTF_16__=1
  define: __FLT64_MAX_10_EXP__=308
  define: __FLT16_MAX_10_EXP__=4
  define: __FLT32_HAS_INFINITY__=1
  define: __DBL_MAX__=double(1.79769313486231570814527423731704357e+308L)
  define: __INT_FAST32_MAX__=0x7fffffffffffffffL
  define: __DBL_HAS_INFINITY__=1
  define: __SIZEOF_FLOAT__=4
  define: __HAVE_SPECULATION_SAFE_VALUE=1
  define: __DEC32_MIN_EXP__=(-94)
  define: __INTPTR_WIDTH__=64
  define: __FLT64X_HAS_INFINITY__=1
  define: __UINT_LEAST32_MAX__=0xffffffffU
  define: __FLT32X_HAS_DENORM__=1
  define: __INT_FAST16_TYPE__=long int
  define: __STRICT_ANSI__=1
  define: __MMX_WITH_SSE__=1
  define: __LDBL_HAS_DENORM__=1
  define: __SEG_GS=1
  define: __cplusplus=202002L
  define: __DEC32_MIN__=1E-95DF
  define: __DEPRECATED=1
  define: __DBL_MAX_EXP__=1024
  define: __WCHAR_WIDTH__=32
  define: __FLT32_MAX__=3.40282346638528859811704183484516925e+38F32
  define: __DEC128_EPSILON__=1E-33DL
  define: __FLT16_DECIMAL_DIG__=5
  define: __SSE2_MATH__=1
  define: __ATOMIC_HLE_RELEASE=131072
  define: __PTRDIFF_MAX__=0x7fffffffffffffffL
  define: __amd64=1
  define: __ATOMIC_HLE_ACQUIRE=65536
  define: __GNUG__=12
  define: __LONG_LONG_MAX__=0x7fffffffffffffffLL
  define: __SIZEOF_SIZE_T__=8
  define: __FLT64X_MIN_EXP__=(-16381)
  define: __SIZEOF_WINT_T__=4
  define: __LONG_LONG_WIDTH__=64
  define: __FLT32_MAX_EXP__=128
  define: __GXX_ABI_VERSION=1017
  define: __FLT128_HAS_INFINITY__=1
  define: __FLT_MIN_EXP__=(-125)
  define: __GCC_HAVE_DWARF2_CFI_ASM=1
  define: __x86_64=1
  define: __INT_FAST64_TYPE__=long int
  define: __FLT64_DENORM_MIN__=4.94065645841246544176568792868221372e-324F64
  define: __DBL_MIN__=double(2.22507385850720138309023271733240406e-308L)
  define: __FLT16_DENORM_MIN__=5.96046447753906250000000000000000000e-8F16
  define: __FLT128_EPSILON__=1.92592994438723585305597794258492732e-34F128
  define: __FLT64X_NORM_MAX__=1.18973149535723176502126385303097021e+4932F64x
  define: __SIZEOF_POINTER__=8
  define: __LP64__=1
  define: __DBL_HAS_QUIET_NAN__=1
  define: __FLT32X_EPSILON__=2.22044604925031308084726333618164062e-16F32x
  define: __DECIMAL_BID_FORMAT__=1
  define: __FLT64_MIN_10_EXP__=(-307)
  define: __FLT16_MIN_10_EXP__=(-4)
  define: __FLT64X_DECIMAL_DIG__=21
  define: __DEC128_MIN__=1E-6143DL
  define: __REGISTER_PREFIX__=
  define: __UINT16_MAX__=0xffff
  define: __LDBL_HAS_INFINITY__=1
  define: __FLT32_MIN__=1.17549435082228750796873653722224568e-38F32
  define: __UINT8_TYPE__=unsigned char
  define: __FLT_DIG__=6
  define: __NO_INLINE__=1
  define: __DEC_EVAL_METHOD__=2
  define: __DEC128_MAX__=9.999999999999999999999999999999999E6144DL
  define: __FLT_MANT_DIG__=24
  define: __LDBL_DECIMAL_DIG__=21
  define: __VERSION__="12.3.0"
  define: __UINT64_C(c)=c ## UL
  define: _STDC_PREDEF_H=1
  define: __INT_LEAST32_MAX__=0x7fffffff
  define: __GCC_ATOMIC_INT_LOCK_FREE=2
  define: __FLT128_MAX_EXP__=16384
  define: __FLT32_MANT_DIG__=24
  define: __FLOAT_WORD_ORDER__=__ORDER_LITTLE_ENDIAN__
  define: __FLT32X_MIN_EXP__=(-1021)
  define: __STDC_IEC_60559_COMPLEX__=201404L
  define: __FLT128_HAS_DENORM__=1
  define: __FLT32_DECIMAL_DIG__=9
  define: __FLT128_DIG__=33
  define: __INT32_C(c)=c
  define: __DEC64_EPSILON__=1E-15DD
  define: __ORDER_PDP_ENDIAN__=3412
  define: __DEC128_MIN_EXP__=(-6142)
  define: __INT_FAST32_TYPE__=long int
  define: __UINT_LEAST16_TYPE__=short unsigned int
  define: __DBL_HAS_DENORM__=1
  define: __SIZE_TYPE__=long unsigned int
  define: __UINT64_MAX__=0xffffffffffffffffUL
  define: __FLT_IS_IEC_60559__=2
  define: __GNUC_WIDE_EXECUTION_CHARSET_NAME="UTF-32LE"
  define: __FLT64X_DIG__=18
  define: __INT8_TYPE__=signed char
  define: __ELF__=1
  define: __GCC_ASM_FLAG_OUTPUTS__=1
  define: __UINT32_TYPE__=unsigned int
  define: __FLT_RADIX__=2
  define: __INT_LEAST16_TYPE__=short int
  define: __LDBL_EPSILON__=1.08420217248550443400745280086994171e-19L
  define: __UINTMAX_C(c)=c ## UL
  define: __k8=1
  define: __FLT32X_MIN__=2.22507385850720138309023271733240406e-308F32x
  define: __SIG_ATOMIC_MAX__=0x7fffffff
  define: __GCC_ATOMIC_WCHAR_T_LOCK_FREE=2
  define: __USER_LABEL_PREFIX__=
  define: __STDC_IEC_60559_BFP__=201404L
  define: __SIZEOF_PTRDIFF_T__=8
  define: __LDBL_DIG__=18
  define: __FLT64_IS_IEC_60559__=2
  define: __x86_64__=1
  define: __FLT16_IS_IEC_60559__=2
  define: __FLT16_MAX_EXP__=16
  define: __DEC32_SUBNORMAL_MIN__=0.000001E-95DF
  define: __INT_FAST16_MAX__=0x7fffffffffffffffL
  define: __GCC_CONSTRUCTIVE_SIZE=64
  define: __FLT64_DIG__=15
  define: __UINT_FAST32_MAX__=0xffffffffffffffffUL
  define: __UINT_LEAST64_TYPE__=long unsigned int
  define: __FLT16_EPSILON__=9.76562500000000000000000000000000000e-4F16
  define: __FLT_HAS_QUIET_NAN__=1
  define: __FLT_MAX_10_EXP__=38
  define: __LONG_MAX__=0x7fffffffffffffffL
  define: __FLT64X_HAS_DENORM__=1
  define: __DEC128_SUBNORMAL_MIN__=0.000000000000000000000000000000001E-6143DL
  define: __FLT_HAS_INFINITY__=1
  define: __GNUC_EXECUTION_CHARSET_NAME="UTF-8"
  define: __UINT_FAST16_TYPE__=long unsigned int
  define: __DEC64_MAX__=9.999999999999999E384DD
  define: __INT_FAST32_WIDTH__=64
  define: __CHAR16_TYPE__=short unsigned int
  define: __PRAGMA_REDEFINE_EXTNAME=1
  define: __SIZE_WIDTH__=64
  define: __SEG_FS=1
  define: __INT_LEAST16_MAX__=0x7fff
  define: __FLT16_NORM_MAX__=6.55040000000000000000000000000000000e+4F16
  define: __DEC64_MANT_DIG__=16
  define: __INT64_MAX__=0x7fffffffffffffffL
  define: __FLT32_DENORM_MIN__=1.40129846432481707092372958328991613e-45F32
  define: __SIG_ATOMIC_WIDTH__=32
  define: __INT_LEAST64_TYPE__=long int
  define: __INT16_TYPE__=short int
  define: __INT_LEAST8_TYPE__=signed char
  define: __FLT16_MAX__=6.55040000000000000000000000000000000e+4F16
  define: __SIZEOF_INT__=4
  define: __DEC32_MAX_EXP__=97
  define: __INT_FAST8_MAX__=0x7f
  define: __FLT128_MAX__=1.18973149535723176508575932662800702e+4932F128
  define: __INTPTR_MAX__=0x7fffffffffffffffL
  define: __FLT64_HAS_QUIET_NAN__=1
  define: __FLT32_MIN_10_EXP__=(-37)
  define: __EXCEPTIONS=1
  define: __PTRDIFF_WIDTH__=64
  define: __LDBL_MANT_DIG__=64
  define: __FLT64_HAS_INFINITY__=1
  define: __FLT64X_MAX__=1.18973149535723176502126385303097021e+4932F64x
  define: __FLT16_HAS_INFINITY__=1
  define: __STDCPP_DEFAULT_NEW_ALIGNMENT__=16
  define: __SIG_ATOMIC_MIN__=(-__SIG_ATOMIC_MAX__ - 1)
  define: __code_model_small__=1
  define: __GCC_ATOMIC_LONG_LOCK_FREE=2
  define: __DEC32_MANT_DIG__=7
  define: __k8__=1
  define: __INTPTR_TYPE__=long int
  define: __UINT16_TYPE__=short unsigned int
  define: __WCHAR_TYPE__=int
  define: __pic__=2
  define: __UINTPTR_MAX__=0xffffffffffffffffUL
  define: __INT_FAST64_WIDTH__=64
  define: __INT_FAST64_MAX__=0x7fffffffffffffffL
  define: __GCC_ATOMIC_TEST_AND_SET_TRUEVAL=1
  define: __FLT_NORM_MAX__=3.40282346638528859811704183484516925e+38F
  define: __FLT64X_MAX_EXP__=16384
  define: __UINT_FAST64_TYPE__=long unsigned int
  define: __INT_MAX__=0x7fffffff
  define: __linux__=1
  define: __INT64_TYPE__=long int
  define: __FLT_MAX_EXP__=128
  define: __ORDER_BIG_ENDIAN__=4321
  define: __DBL_MANT_DIG__=53
  define: __SIZEOF_FLOAT128__=16
  define: __INT_LEAST64_MAX__=0x7fffffffffffffffL
  define: __DEC64_MIN__=1E-383DD
  define: __WINT_TYPE__=unsigned int
  define: __UINT_LEAST32_TYPE__=unsigned int
  define: __SIZEOF_SHORT__=2
  define: __FLT32_NORM_MAX__=3.40282346638528859811704183484516925e+38F32
  define: __SSE__=1
  define: __LDBL_MIN_EXP__=(-16381)
  define: __FLT64_MAX__=1.79769313486231570814527423731704357e+308F64
  define: __amd64__=1
  define: __WINT_WIDTH__=32
  define: __INT_LEAST64_WIDTH__=64
  define: __LDBL_MAX_EXP__=16384
  define: __FLT32X_MAX_10_EXP__=308
  define: __SIZEOF_INT128__=16
  define: __FLT16_MIN__=6.10351562500000000000000000000000000e-5F16
  define: __FLT64X_IS_IEC_60559__=2
  define: __LDBL_MAX_10_EXP__=4932
  define: __ATOMIC_RELAXED=0
  define: __DBL_EPSILON__=double(2.22044604925031308084726333618164062e-16L)
  define: __FLT128_MIN__=3.36210314311209350626267781732175260e-4932F128
  define: _LP64=1
  define: __UINT8_C(c)=c
  define: __FLT64_MAX_EXP__=1024
  define: __INT_LEAST32_TYPE__=int
  define: __SIZEOF_WCHAR_T__=4
  define: __GNUC_PATCHLEVEL__=0
  define: __FLT128_NORM_MAX__=1.18973149535723176508575932662800702e+4932F128
  define: __FLT64_NORM_MAX__=1.79769313486231570814527423731704357e+308F64
  define: __FLT128_HAS_QUIET_NAN__=1
  define: __INTMAX_MAX__=0x7fffffffffffffffL
  define: __INT_FAST8_TYPE__=signed char
  define: __FLT64X_MIN__=3.36210314311209350626267781732175260e-4932F64x
  define: __STDCPP_THREADS__=1
  define: __GNUC_STDC_INLINE__=1
  define: __FLT64_HAS_DENORM__=1
  define: __FLT32_EPSILON__=1.19209289550781250000000000000000000e-7F32
  define: __FLT16_HAS_DENORM__=1
  define: __DBL_DECIMAL_DIG__=17
  define: __STDC_UTF_32__=1
  define: __INT_FAST8_WIDTH__=8
  define: __FXSR__=1
  define: __FLT32X_MAX__=1.79769313486231570814527423731704357e+308F32x
  define: __DBL_NORM_MAX__=double(1.79769313486231570814527423731704357e+308L)
  define: __BYTE_ORDER__=__ORDER_LITTLE_ENDIAN__
  define: __GCC_DESTRUCTIVE_SIZE=64
  define: __INTMAX_WIDTH__=64
  define: __UINT64_TYPE__=long unsigned int
  define: __UINT32_C(c)=c ## U
  define: __FLT_DENORM_MIN__=1.40129846432481707092372958328991613e-45F
  define: __FLT128_IS_IEC_60559__=2
  define: __INT8_MAX__=0x7f
  define: __LONG_WIDTH__=64
  define: __PIC__=2
  define: __UINT_FAST32_TYPE__=long unsigned int
  define: __FLT16_MANT_DIG__=11
  define: __FLT32X_NORM_MAX__=1.79769313486231570814527423731704357e+308F32x
  define: __CHAR32_TYPE__=unsigned int
  define: __FLT_MAX__=3.40282346638528859811704183484516925e+38F
  define: __SSE2__=1
  define: __INT32_TYPE__=int
  define: __SIZEOF_DOUBLE__=8
  define: __FLT_MIN_10_EXP__=(-37)
  define: __FLT64_MIN__=2.22507385850720138309023271733240406e-308F64
  define: __INT_LEAST32_WIDTH__=32
  define: __INTMAX_TYPE__=long int
  define: __DEC128_MAX_EXP__=6145
  define: __FLT32X_HAS_QUIET_NAN__=1
  define: __ATOMIC_CONSUME=1
  define: __GNUC_MINOR__=3
  define: __INT_FAST16_WIDTH__=64
  define: __UINTMAX_MAX__=0xffffffffffffffffUL
  define: __PIE__=2
  define: __FLT32X_DENORM_MIN__=4.94065645841246544176568792868221372e-324F32x
  define: __DBL_MAX_10_EXP__=308
  define: __LDBL_DENORM_MIN__=3.64519953188247460252840593361941982e-4951L
  define: __GCC_ATOMIC_CHAR8_T_LOCK_FREE=2
  define: __INT16_C(c)=c
  define: __STDC__=1
  define: __FLT32X_DIG__=15
  define: __PTRDIFF_TYPE__=long int
  define: __ATOMIC_SEQ_CST=5
  define: __FLT32X_MIN_10_EXP__=(-307)
  define: __UINTPTR_TYPE__=long unsigned int
  define: __DEC64_SUBNORMAL_MIN__=0.000000000000001E-383DD
  define: __DEC128_MANT_DIG__=34
  define: __LDBL_MIN_10_EXP__=(-4931)
  define: __SSE_MATH__=1
  define: __SIZEOF_LONG_LONG__=8
  define: __FLT128_DECIMAL_DIG__=36
  define: __GCC_ATOMIC_LLONG_LOCK_FREE=2
  define: __FLT32_HAS_QUIET_NAN__=1
  define: __FLT_DECIMAL_DIG__=9
  define: __UINT_FAST16_MAX__=0xffffffffffffffffUL
  define: __LDBL_NORM_MAX__=1.18973149535723176502126385303097021e+4932L
  define: __GCC_ATOMIC_SHORT_LOCK_FREE=2
  define: __UINT_FAST8_TYPE__=unsigned char
  define: _GNU_SOURCE=1
  define: __ATOMIC_ACQ_REL=4
  define: __ATOMIC_RELEASE=3
  other: --g++
  other: --gnu_version=120300
  stdver: c++20
  intelliSenseMode: linux-gcc-x64
Update IntelliSense time (sec): 0.12
LSP: (received) cpptools/getFoldingRanges: file:///home/savoie/intellibug/main.cpp (id: 1233)
LSP: (invoked) cpptools/getFoldingRanges: file:///home/savoie/intellibug/main.cpp (id: 1233)
LSP: Sending response (id: 1233)
Other Extensions

Many extensions installed, however all except C/C++ were disabled, and the issue persists.

Additional context

No response

Contributor guide

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the report in main.cpp using the listed C++20 IntelliSense configuration and compare its diagnostic with gcc --std=c++20 main.cpp. The issue is done when IntelliSense no longer flags the operator with the nonliteral return-type error while the example still compiles successfully.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
devtools
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
38/100

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