C error found - error: lvalue expected when use @[heap] on a struct

[forchid]

Describe the bug

>v run linkedlist.v
==================
C:/Users/Administrator/AppData/Local/Temp/v_0/linkedlist.01HX1VDT6BBT28Z16ZCX03WCB5.tmp.c:7376: warning: implicit declaration of function 'tcc_backtrace'
C:/Users/Administrator/AppData/Local/Temp/v_0/linkedlist.01HX1VDT6BBT28Z16ZCX03WCB5.tmp.c:16211: error: lvalue expected
...
==================
(Use `v -cg` to print the entire error message)

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 .

Reproduction Steps

V source code

import time
// 41s.
struct Node<T> {
  mut:
    data T
    prev ?&Node<T>
    next ?&Node<T>
}

struct LinkedList<T> {
  mut:
    size usize
    head ?&Node<T>
}

fn new_linked_list[T]() &LinkedList<T> {
  return &LinkedList<T>{}
}

fn (mut li LinkedList<T>) add[T](data T) {
  mut node := &Node<T>{ data, none, none }
  
  if li.head == none {
    li.head = node
    node.next = node
    node.prev = node
  } else {
    node.next = li.head
    node.prev = li.head?.prev
    node.prev?.next = node
    li.head?.prev = node
  }
  
  li.size += 1
}

fn (mut li LinkedList<T>) pop[T]() ?T {
  if li.head == none {
    return none
  }
  if li.size == 1 {
    data := li.head?.data
    li.head?.next = none
    li.head?.prev = none
    li.head = none
    li.size -= 1
    return data
  }
  
  mut tail := li.head?.prev?
  mut curr := tail.prev?
  curr.next = li.head
  li.head?.prev = curr
  
  tail.next = none
  tail.prev = none
  li.size -= 1
  
  return tail.data
}

@[heap] // It's ok if commenting this line
struct Integer {
  mut:
    value int
}

fn (mut i Integer) inc() {
  i.value += 1
}

fn main() {
max_itr := 10
t := time.now()
for itr in 0 .. max_itr {
  mut a := &Integer{1}
  b := a
  a.inc()
  assert a.value == b.value && b.value == 2

  mut list := new_linked_list<Integer>()
  println('Itr#$itr list size: $list.size')
  
  list.add(Integer{10})
  println('Itr#$itr list size: $list.size')
  list.add(Integer{20})
  println('Itr#$itr list size: $list.size')
  
  mut n := list.pop()
  println('Itr#$itr list size: $list.size, data: ${n?}')
  n = list.pop()
  println('Itr#$itr list size: $list.size, data: ${n?}')
  n = list.pop()
  println('Itr#$itr list size: $list.size, data: $n')
  
  max := 1000_0000
  step := 100_0000
  for i in 0 .. max {
    mut item := Integer{i};
    //item.inc()
    list.add(item)
    item.inc()
    assert item.value == i + 1
    if i % step == 0 {
      println('Itr#$itr list add: $list.size, i: $i')
    }
  }
  for i in 0 .. max {
    list.pop()
    //item := list.pop()
    //assert item?.value == max - i
    if i % step == 0 {
      println('Itr#$itr list pop: $list.size, i: $i')
    }
  }
  println('Itr#$itr list size: $list.size')
}
  d := time.since(t)
  println('Bye(time $d)!')
}

Run it

>v run linkedlist.v

Expected Behavior

Run it normally.

Current Behavior

error: lvalue expected.
C error found.

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.5 0459519

Environment details (OS name and version, etc.)

>v doctor
V full version: V 0.4.5 937a36a.0459519
OS: windows, Microsoft Windows 10 רҵ v19042 64 λ
Processor: 4 cpus, 64bit, little endian,

getwd: D:\code\lang\vlang\ds
vexe: D:\Programs\v\v.exe
vexe mtime: 2024-05-02 06:28:06

vroot: OK, value: D:\Programs\v
VMODULES: OK, value: C:\Users\Administrator\.vmodules
VTMP: OK, value: C:\Users\Administrator\AppData\Local\Temp\v_0

Git version: git version 2.33.1.windows.1
Git vroot status: Error: fatal: not a git repository (or any of the parent directories): .git
.git/config present: false

CC version: Error: 'cc' is not recognized as an internal or external command,
operable program or batch file.

thirdparty/tcc: N/A

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