incorrect defer usage cause error: field not found: field #25148
Description
Describe the bug
An incorrectly use of defer in a $for loop, will cause C error.
Reproduction Steps
d.v
struct Struct {
s string
i int
}
fn main() {
tst := Struct{
s: 'tst-s'
i: 42
}
$for field in Struct.fields {
$if field.typ is string {
defer {
if tst.$(field.name) == 'tst-s' {
println('found tst-s')
}
}
}
}
}
v d.v
Expected Behavior
a error report about incorrect use of defer.
Current Behavior
$ v d.v
================== C compilation error (from tcc): ==============
cc: /tmp/v_1000/d.01K353S3XNQ49EDW7VZ44K8WG3.tmp.c:1615: error: field not found: field
=================================================================
(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 .
Possible Solution
fix checker or cgen
Additional Information/Context
more discussion can be found at PR #25146
V version
V 0.4.11 9f91064
Environment details (OS name and version, etc.)
| V full version | V 0.4.11 9f91064 |
|---|---|
| OS | linux, Ubuntu 24.04.3 LTS |
| Processor | 8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz |
| Memory | 12.11GB/15.51GB |
| V executable | /media/HD/github/kbkpbot/v/v |
| V last modified time | 2025-08-21 01:24:03 |
| V home dir | OK, value: /media/HD/github/kbkpbot/v |
| VMODULES | OK, value: /home/mars/.vmodules |
| VTMP | OK, value: /tmp/v_1000 |
| Current working dir | OK, value: /home/mars/v/bug/comptime/j |
| Git version | git version 2.43.0 |
| V git status | weekly.2025.17-604-g14a1b59d |
| .git/config present | true |
| cc version | cc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0 |
| gcc version | gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0 |
| clang version | Ubuntu clang version 18.1.3 (1ubuntu1) |
| tcc version | tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux) |
| tcc git status | thirdparty-linux-amd64 696c1d84 |
| emcc version | N/A |
| glibc version | ldd (Ubuntu GLIBC 2.39-0ubuntu8.5) 2.39 |
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