[vls] can't use keyword in struct define

[kbkpbot]

Describe the bug

When use mut keyword in a struct define, it will cause vls report error.

Reproduction Steps

sample_text.v

module main


struct MyS{
mut:
	b int
	a string
}

Open this file with VSCode, which enable vls.

Expected Behavior

No error report in VSCode.

Current Behavior

note that there is a syntax error report , that "expected } to finish a struct definition"

Possible Solution

This is really a v parser limit that we can't use keywords in a struct definition.

v/vlib/v/parser/struct.v

Lines 133 to 143 in d9e962f

	p.check(.lcbr)
	// if p.is_vls && p.tok.kind == .key_struct { // p.tok.is_key() {
	if p.is_vls && p.tok.is_key() {
	// End parsing after `struct Foo {` in vls mode to avoid lots of junk errors
	// If next token after { is a key, the struct wasn't finished
	p.error('expected `}` to finish a struct definition')
	p.should_abort = true
	return ast.StructDecl{
	name: name
	}
	}

I suggest remove this limit.

Additional Information/Context

No response

V version

V 0.4.12 d9e962f

Environment details (OS name and version, etc.)

V full version	V 0.4.12 d9e962f
OS	linux, Ubuntu 24.04.3 LTS
Processor	8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz
Memory	11.56GB/15.51GB
V executable	/media/HD/github/kbkpbot/v/v
V last modified time	2025-10-21 01:01:26
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/vls
Git version	git version 2.43.0
V git status	weekly.2025.42-35-gd9e962f1
.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 2.39-0ubuntu8.6) 2.39

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[JalonSolov]

I disagree. Using mut as in your example is perfectly valid and allowed by V, or most of V and the stdlib wouldn't compile. This must be something specific to the vls mode.

[medvednikov]

if p.is_vls && p.tok.is_key() {

This check should stay, but it should be if p.is_vls && (p.tok.is_key() && p.tok.kind != .key_mut) {