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V version: V 0.3.0 0d6d6f7.ac7e809 OS: linux, "EndeavourOS Linux"

What did you do? Tried to encode a struct with an enum array with json.encode. Standalone example

import json

enum TestEnum {
	one = 1
}

struct TestStruct {
	test []TestEnum
}

fn main () {
	println(json.encode(TestStruct{test: [TestEnum.one]}))
}

Ran with v -cg run .

What did you expect to see?

{"test":[1]}

What did you see instead?

/usr/lib64/crt1.o: error: Invalid relocation entry [15] '.rela.debug_info' @ 000004f5
tcc: error: file 'crt1.o' not found
/tmp/v_1000/something.8468612194315468929.tmp.c:2209: error: '_option_main__TestEnum' undeclared
builder error: 
==================
C error. This should never happen.

This is a compiler bug, please report it using `v bug file.v`.

https://github.com/vlang/v/issues/new/choose

You can also use #help on Discord: https://discord.gg/vlang

Managed to simplify the issue some more

json2

{"test":}

Fixed on json 2 {"test":[1]}

import x.json2 as json

enum TestEnum {
	one = 1
}

struct TestStruct {
	test []TestEnum
}

fn main () {
	println(json.encode(TestStruct{test: [TestEnum.one]}))
}

Please do not close json related bugs, just because x.json2 does not have that behavior.

Providing a workaround is one (good) thing, but json continues to be integrated into the compiler, and cgen for it for this case is still broken - I've just tried it with latest V.

Another short example, it looks like the issue with enums.

import json

pub enum MyEnum {
	foo
	bar
}

fn main() {
	q := MyEnum.foo
	println(json.encode(q))
}

Error:

/tmp/v_501/b.6858117115493464732.tmp.c:2255:4: warning: expression result unused [-Wunused-value]
  (*(int*)_t1.data);
   ^~~~~~~~~~~~~~~
/tmp/v_501/b.6858117115493464732.tmp.c:12594:15: error: implicit declaration of function 'json__encode_main__MyEnum' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        cJSON* _t1 = json__encode_main__MyEnum(q);
                     ^
/tmp/v_501/b.6858117115493464732.tmp.c:12594:9: warning: incompatible integer to pointer conversion initializing 'cJSON *' (aka 'struct cJSON *') with an expression of type 'int' [-Wint-conversion]
        cJSON* _t1 = json__encode_main__MyEnum(q);
               ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 warnings and 1 error generated.
builder error:
==================
C error. This should never happen.