V error not allowing locking of element in array of shared structs

[islonely]

V version: V 0.4.9 bed28d1, press to see full `v doctor` output

V full version	V 0.4.9 4225a34.bed28d1
OS	macos, macOS, 15.1.1, 24B91
Processor	8 cpus, 64bit, little endian, Apple M3
Memory	0.24GB/16GB
V executable	/Users/adamoates/v/v
V last modified time	2025-01-11 13:57:09
V home dir	OK, value: /Users/adamoates/v
VMODULES	OK, value: /Users/adamoates/.vmodules
VTMP	OK, value: /tmp/v_501
Current working dir	OK, value: /Users/adamoates/.vmodules/islonely/mouse
Git version	git version 2.39.5 (Apple Git-154)
V git status	weekly.2025.1-29-gbed28d1e (10 commit(s) behind V master)
.git/config present	true
cc version	Apple clang version 16.0.0 (clang-1600.0.26.4)
gcc version	Apple clang version 16.0.0 (clang-1600.0.26.4)
clang version	Apple clang version 16.0.0 (clang-1600.0.26.4)
tcc version	tcc version 0.9.28rc 2024-02-05 HEAD@105d70f7 (AArch64 Darwin)
tcc git status	thirdparty-macos-arm64 713692d4
emcc version	N/A
glibc version	N/A

What did you do?
./v -g -o vdbg cmd/v && ./vdbg /Users/adamoates/Documents/test.v && /Users/adamoates/Documents/test

struct Foo {
mut:
    bars []shared Bar
}

struct Bar {}

fn main() {
    mut foo := Foo{}
    foo.foo << Bar{}
    lock foo.bars[0] {
        println(foo.bars[0])
    }
}

What did you see?

/Users/adamoates/Documents/test.v:11:18: error: unexpected token `[`, expecting one or more shared variable names
    9 |     mut foo := Foo{}
   10 |     foo.foo << Bar{}
   11 |     lock foo.bars[0] {
      |                  ^
   12 |         println(foo.bars[0])
   13 |     }

What did you expect to see?

Expected code to compile and lock the first element in the array.

Note

You can use the 👍 reaction to increase the issue's priority for developers.

Please note that only the 👍 reaction to the issue itself counts as a vote.
Other reactions and those to comments will not be taken into account.

[huly-for-github]

Connected to Huly®: V_0.6-21879

[spytheman]

Please use complete examples.

The above lacks foo fields, and the declaration for Bar.