cgen error for program compiled with -autofree

[spytheman]

V doctor:

V full version: V 0.4.6 c689f80.66ea826
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: 2024-07-09 14:39:24

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

Git version: git version 2.43.2
Git vroot status: weekly.2024.27-36-g494be205
.git/config present: true

CC version: cc (Ubuntu 10.5.0-1ubuntu1~20.04) 10.5.0
thirdparty/tcc status: thirdparty-linux-amd64 40e5cbb5

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

struct Abc {}

struct Xyz {}

fn (a Abc) emethod() !Xyz {
	return Xyz{}
}

fn f() !string {
	a := Abc{}
	return a.emethod()!.str().all_before(':')
}

x := f()!
dump(x)

What did you expect to see?

A compiled program, even with -autofree

What did you see instead?

#1 21:31:30 ^ master /v/oo>v -g -o vdbg cmd/v && ./vdbg -autofree x.v
==================
/tmp/v_1000/x.01J2CC7T6XBRCXX4428TTY1JYR.tmp.c:13140: error: 'lt' undeclared
...
==================
(Use `v -cg` to print the entire error message)

#1 21:31:34 ^ master /v/oo>

The above is a simplification discovered, while debugging a CI failure for #21831 .

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