Allow same enum value

[kbkpbot]

Describe the feature

As in C/C++, enum can has same values

typedef enum
{
    SimdWarpAffineDefault = 0, /*!< Default Warp Affine flags. */
    SimdWarpAffineChannelByte = 0, /*!<  8-bit integer channel type. */
    SimdWarpAffineChannelMask = 1, /*!< Bit mask of channel type. */
    SimdWarpAffineInterpNearest = 0, /*!< Nearest pixel interpolation method. */
    SimdWarpAffineInterpBilinear = 2, /*!< Bilinear pixel interpolation method. */
    SimdWarpAffineInterpMask = 2, /*!< Bit mask of pixel interpolation options. */
    SimdWarpAffineBorderConstant = 0, /*!< Nearest pixel interpolation method. */
    SimdWarpAffineBorderTransparent = 4, /*!< Bilinear pixel interpolation method. */
    SimdWarpAffineBorderMask = 4, /*!< Bit mask of pixel interpolation options. */
} SimdWarpAffineFlags;

But in v, this will cause compile error:

module main

enum SimdWarpAffineFlags {
        simd_warp_affine_default            = 0
        simd_warp_affine_channel_byte       = 0
        simd_warp_affine_channel_mask       = 1
        simd_warp_affine_interp_nearest     = 0
        simd_warp_affine_interp_bilinear    = 2
        simd_warp_affine_interp_mask        = 2
        simd_warp_affine_border_constant    = 0
        simd_warp_affine_border_transparent = 4
        simd_warp_affine_border_mask        = 4
}

fn main() {
}

test.v:5:40: error: enum value `0` already exists
    3 | enum SimdWarpAffineFlags {
    4 |     simd_warp_affine_default            = 0
    5 |     simd_warp_affine_channel_byte       = 0
      |                                           ^
    6 |     simd_warp_affine_channel_mask       = 1
    7 |     simd_warp_affine_interp_nearest     = 0
test.v:7:40: error: enum value `0` already exists
    5 |     simd_warp_affine_channel_byte       = 0
    6 |     simd_warp_affine_channel_mask       = 1
    7 |     simd_warp_affine_interp_nearest     = 0
      |                                           ^
    8 |     simd_warp_affine_interp_bilinear    = 2
    9 |     simd_warp_affine_interp_mask        = 2
test.v:9:40: error: enum value `2` already exists
    7 |     simd_warp_affine_interp_nearest     = 0
    8 |     simd_warp_affine_interp_bilinear    = 2
    9 |     simd_warp_affine_interp_mask        = 2
      |                                           ^
   10 |     simd_warp_affine_border_constant    = 0
   11 |     simd_warp_affine_border_transparent = 4
test.v:10:40: error: enum value `0` already exists
    8 |     simd_warp_affine_interp_bilinear    = 2
    9 |     simd_warp_affine_interp_mask        = 2
   10 |     simd_warp_affine_border_constant    = 0
      |                                           ^
   11 |     simd_warp_affine_border_transparent = 4
   12 |     simd_warp_affine_border_mask        = 4
test.v:12:40: error: enum value `4` already exists
   10 |     simd_warp_affine_border_constant    = 0
   11 |     simd_warp_affine_border_transparent = 4
   12 |     simd_warp_affine_border_mask        = 4
      |                                           ^
   13 | }
   14 |

I think v can also support same values in enum.

Use Case

When rewrite some C/C++ code, it need the same enum values.

Proposed Solution

Fix cgen/checker?

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

Version used

V full version: V 0.4.7 6e8124f.62ab1be

Environment details (OS name and version, etc.)

V full version: V 0.4.7 6e8124f.62ab1be
OS: linux, Ubuntu 24.04.1 LTS
Processor: 8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz

getwd: /media/HD/github/algo/Simd/src/Simd
vexe: /media/HD/github/lang/v/v
vexe mtime: 2024-09-11 14:36:36

vroot: OK, value: /media/HD/github/lang/v
VMODULES: OK, value: /home/mars/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.43.0
Git vroot status: weekly.2024.36-47-ge0422de8 (16 commit(s) behind V master)
.git/config present: true

CC version: cc (Ubuntu 13.2.0-23ubuntu4) 13.2.0
thirdparty/tcc status: thirdparty-linux-amd64 0134e9b9

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[spytheman]

Use @[_allow_multiple_values] to tag the enum.

[Delta456]

This attribute isn't documented and a hint must be given when this error occurs.