compiler error when adding @[raw] to a non-string field in a struct

[Nasko-5]

V version: V 0.4.11 38519ec, press to see full `v doctor` output

V full version	V 0.4.11 38519ec
OS	windows, Microsoft Windows 10 Pro 19045 64-bit
Processor	4 cpus, 64bit, little endian, Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz
Memory	1.5GB/15.95GB
V executable	D:\programs\v\v.exe
V last modified time	2025-08-26 06:29:11
V home dir	OK, value: D:\programs\v
VMODULES	OK, value: C:\Users\sect0.vmodules
VTMP	OK, value: C:\Users\sect0\AppData\Local\Temp\v_0
Current working dir	contains spaces, value: D:\My stuff\.programming\vlang\scraper
Git version	git version 2.43.0.windows.1
V git status	N/A
.git/config present	false
cc version	cc (Rev2, Built by MSYS2 project) 14.2.0
gcc version	gcc (Rev2, Built by MSYS2 project) 14.2.0
clang version	N/A
msvc version	Microsoft (R) C/C++ Optimizing Compiler Version 19.39.33523 for x86
tcc version	tcc version 0.9.27 (x86_64 Windows)
tcc git status	N/A
emcc version	N/A
glibc version	N/A

What did you do?
./v -g -o vdbg cmd/v && ./vdbg .\olx\resultstructs.v && D:\My stuff\.programming\vlang\scraper\olx\resultstructs.exe
See attached file .\olx\resultstructs.v

What did you see?

olx/resultstructs.v:3:9: warning: module 'json2 (x.json2)' is imported but never used
    1 | module olx
    2 | 
    3 | import  x.json2
      |         ~~~~~~~
    4 | import time
    5 |
olx/resultstructs.v:1:1: error: project must include a `main` module or be a shared library (compile with `v -shared`)
    1 | module olx
      | ^
    2 | 
    3 | import  x.json2
================== C compilation error (from tcc): ==============
cc: D:/programs/v/thirdparty/vschannel/vschannel.c:300: warning: assignment from incompatible pointer type
cc: C:/Users/sect0/AppData/Local/Temp/v_0/scraper.01K4X0VTA6DDJVA07MAFX9RT3A.tmp.c:10409: error: cannot convert 'struct string' to 'struct olx__ParamValue'
...
cc: C:/Users/sect0/AppData/Local/Temp/v_0/scraper.01K4X0VTA6DDJVA07MAFX9RT3A.tmp.c:10409: error: cannot convert 'struct string' to 'struct olx__ParamValue'
(note: the original output was 13 lines long; it was truncated to its first 2 lines + the last line)
=================================================================
(You can pass `-cg`, or `-show-c-output` as well, to print all the C error messages).
builder error:
==================
C error found. It should never happen, when compiling pure V code.
This is a V compiler bug, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .

What did you expect to see?

i kind of forgot to define ListingParams.value to use string instead of ParamValue... i was trying to figure out how to get json.decode to select PriceParam/CheckboxesParam/SelectParam depending on ListingParams.param_type

resultstructs.v.txt

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[huly-for-github]

Connected to Huly®: V_0.6-25253

[felipensp]

I can't reproduce it on Linux.

[Nasko-5]

I can't reproduce it on Linux.

can you try compiling this? i made a smaller example that causes a similar error
test.v.txt

C:\Users\sect0\Downloads>v run test.v
================== C compilation error (from tcc): ==============
cc: d:/programs/v/thirdparty/tcc/include/winapi/synchapi.h:167: warning: CreateMutex redefined
cc: C:/Users/sect0/AppData/Local/Temp/v_0/test.01K4YVBXGR2SAJ0HSPGB4CJ64T.tmp.c:1543: error: cannot convert 'struct string' to 'int'
...
cc: C:/Users/sect0/AppData/Local/Temp/v_0/test.01K4YVBXGR2SAJ0HSPGB4CJ64T.tmp.c:1543: error: cannot convert 'struct string' to 'int'
(note: the original output was 8 lines long; it was truncated to its first 2 lines + the last line)
=================================================================
(You can pass `-cg`, or `-show-c-output` as well, to print all the C error messages).
builder error:
==================
C error found. It should never happen, when compiling pure V code.
This is a V compiler bug, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .

[Larsimusrex]

It works correctly with decoder2:

import x.json2.decoder2 as json

struct Test {
	a int
	b int @[raw]
}


fn main() {
	json.decode[Test]('{"a": 10, "b": "string"}') or {panic(err)}
}

outputs:

V panic: x.json2.decoder2.JsonDecodeError: 
1:16: Invalid json: Data: `raw` attribute can only be used with string fields
{"a": 10, "b": "string"}
               ~~~~~~~~
v hash: a8d200a
/tmp/v_1000/test.tmp.c:4892: at builtin___v_panic: Backtrace
/tmp/v_1000/test.tmp.c:10009: by main__main
/tmp/v_1000/test.tmp.c:10055: by main

[Delta456]

@Nasko-5 can you try with the latest version?