Map of fixed array initialisations

[thesombady]

Describe the bug

Having a struct with a field of type map[string][VALUE]Struct generates faulty C code.

The snippet breaks at the following line est.mod_files['main'][i] = File{} where switching the index to an integer literal no longer brakes the program.

truct File {
    root string
    path string
}

struct Test {
mut:
    mod_files map[string][5]File
}

fn main() {
    mut test := Test{}
    for i in 0 .. 4 {
        test.mod_files['main'][i] = File{}
    }
    dump(test)
}

Reproduction Steps

module main

struct File {
    root string
    path string
}

struct Test {
mut:
    mod_files map[string][5]File
}

fn main() {
    mut test := Test{}
    for i in 0 .. 4 {
        test.mod_files['main'][i] = File{}
    }
    dump(test)
}

Expected Behavior

The expected behaviour is that one set individual elements of the array.

Current Behavior

The program compiles but provides a C error

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.7 01fd719

Environment details (OS name and version, etc.)

V full version: V 0.4.7 39e550f.01fd719
OS: macos, macOS, 14.5, 23F79
Processor: 8 cpus, 64bit, little endian, Apple M2

getwd: /Users/andreas/dev/zlang
vexe: /Users/andreas/v/v
vexe mtime: 2024-08-29 18:02:46

vroot: OK, value: /Users/andreas/v
VMODULES: OK, value: /Users/andreas/.vmodules
VTMP: OK, value: /tmp/v_501

Git version: git version 2.45.1
Git vroot status: weekly.2024.24-338-g01fd7191
.git/config present: true

CC version: Apple clang version 15.0.0 (clang-1500.3.9.4)
thirdparty/tcc status: thirdparty-macos-arm64 5c1d002f

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[JalonSolov]

C error happens on Mac.

On Linux, you get a V error of error: constant expression expected on this line:

       test.mod_files['main'][i] = File{}

[thesombady]

Spytheman tried it to and did not get a V error. And I believe he said it was on a Windows.

[JalonSolov]

He said he also got the C error. He didn't mention Windows. https://discord.com/channels/592103645835821068/592114487759470596/1278793127242502175

[thesombady]

My misstake!