Spawning anonymous functions that have no input arguments (example from book: Getting Started with V Programming) fails

[denise-amiga]

V version: V 0.4.10 52c7130, press to see full `v doctor` output

V full version	V 0.4.10 22d2d1a.52c7130
OS	linux, "Manjaro Linux"
Processor	16 cpus, 64bit, little endian, AMD Ryzen 9 7940HS w/ Radeon 780M Graphics
Memory	13.68GB/30.57GB
V executable	/home/pepe/Dev/v/v
V last modified time	2025-05-25 10:55:16
V home dir	OK, value: /home/pepe/Dev/v
VMODULES	OK, value: /home/pepe/.vmodules
VTMP	OK, value: /tmp/v_1000
Current working dir	OK, value: /home/pepe/_mysrc/test/vlang
Git version	git version 2.49.0
V git status	weekly.2025.21-26-g52c7130a
.git/config present	true
cc version	cc (GCC) 15.1.1 20250425
gcc version	gcc (GCC) 15.1.1 20250425
clang version	clang version 19.1.7
tcc version	tcc version 0.9.28rc 2024-02-05 HEAD@105d70f7 (x86_64 Linux)
tcc git status	thirdparty-linux-amd64 a0799a5b
emcc version	N/A
glibc version	ldd (GNU libc) 2.41

What did you do?
./v -g -o vdbg cmd/v && ./vdbg concurrency06.v && concurrency06

module main

fn main() {
	t := go fn () string {
		return 'hi'
	}()
	x := t.wait()
	println(typeof(x).name) // string
	println(x) // hi
}

What did you see?

Compilation with unknown C compiler
================== C compilation error (from tcc): ==============
cc: /tmp/v_1000/concurrency06.01JW4FBQ8TPYRJTYPD78066AW9.tmp.c:1290: warning: implicit declaration of function '_v_free'
cc: tcc: error: undefined symbol '_v_free'
=================================================================
(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?
string
hi

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[huly-for-github]

Connected to Huly®: V_0.6-22942

[JalonSolov]

Also on Manjaro here, and I get 2 error messages...

/tmp/v_1000/x.01JW4H6S1N8GXSZPJT9QD4J909.tmp.c:1293: warning: implicit declaration of function '_v_free'
/home/jalon/git/v/thirdparty/tcc/lib/libgc.a: error: 'GC_noop1_ptr' defined twice
tcc: error: undefined symbol '_v_free'

[felipensp]

As temporary workaround pass -no-skip-unused.

[ctkjose]

Added comments to PR 24580