cgen error on v -autofree run bug.v

[spytheman]

V doctor:

OS: linux, Ubuntu 20.04.5 LTS
Processor: 4 cpus, 64bit, little endian, Intel(R) Core(TM) i3-3225 CPU @ 3.30GHz
CC version: cc (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0

getwd: /v/vnew
vmodules: /home/delian/.vmodules
vroot: /v/vnew
vexe: /v/vnew/v
vexe mtime: 2023-01-02 14:49:05
is vroot writable: true
is vmodules writable: true
V full version: V 0.3.2 f71572a

Git version: git version 2.39.0
Git vroot status: weekly.2023.01-3-g9bee702c (2 commit(s) behind V master)
.git/config present: true
thirdparty/tcc status: thirdparty-linux-amd64 12f392c3

What did you do?
v -autofree bug.v

import os
import json

struct Syntax {
	name       string
	extensions []string
	fmt_cmd    string
	keywords   []string
	literals   []string
}

fn main() {
	println('loading syntax files...')
	mut syntaxes := []Syntax{}
	files := os.walk_ext('.', '.syntax')
	for file in files {
		syntaxes << json.decode(Syntax, os.read_file(file) or {
			eprintln('    error: cannot load syntax file ${file}: ${err.msg()}')
			'{}'
		}) or {
			eprintln('    error: cannot load syntax file ${file}: ${err.msg()}')
			Syntax{}
		}
	}
	println('${files.len} syntax files loaded')
	dump(syntaxes)
}

What did you expect to see?

A compiled program.

What did you see instead?

#0 23:26:37 ᛋ master /v/vnew❱v -autofree bug.v
==================
/tmp/v_1000/bug.1718565114937288798.tmp.c:18618: error: 'err' undeclared
...
==================
(Use `v -cg` to print the entire error message)

Note, that the same program does compile, and runs fine with just v run bug.v, i.e. the problem is entirely with what code is generated only with -autofree:

loading syntax files...
0 syntax files loaded
[bug.v:26] syntaxes: []

[spytheman]

The following workaround (splitting the 2nd argument to json.decode to its own local variable), fixes compilation with -autofree:

		content := os.read_file(file) or {
			eprintln('    error: cannot load syntax file ${file}: ${err.msg()}')
			'{}'
		}
		syntaxes << json.decode(Syntax, content) or {
			eprintln('    error: cannot load syntax file ${file}: ${err.msg()}')
			Syntax{}
		}