missing checker notice/warning for a known duplicate value in a if x in [val1, val1, val2] {

[spytheman]

V doctor:

V full version: V 0.4.7 4ee948f.1a4ad55
OS: linux, Ubuntu 20.04.6 LTS
Processor: 2 cpus, 64bit, little endian, Intel(R) Core(TM) i3-3225 CPU @ 3.30GHz

getwd: /space/v/oo
vexe: /space/v/oo/v
vexe mtime: 2024-09-25 08:03:20

vroot: OK, value: /space/v/oo
VMODULES: OK, value: /home/delian/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.46.0
Git vroot status: weekly.2024.39-12-g1a4ad556
.git/config present: true

CC version: cc (Ubuntu 10.5.0-1ubuntu1~20.04) 10.5.0
thirdparty/tcc status: thirdparty-linux-amd64 0134e9b9

What did you do?
./v -g -o vdbg cmd/v && ./vdbg /v/misc/2024_09_25__11/a.v

if 1 in [1, 2, 2, 2] { println('ok') }
println('done')

What did you expect to see?

A compiler notice or warning, that 2 is a duplicate value in the condition list, used for the x in list check .

What did you see instead?

ok
done

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