Fable is generating invalid Javascript for inline fuction returning object

[sWW26]

Description

Fable is generating invalid Javascript for inline function call that immediately calls function on returned object.

Repro code

https://fable.io/repl/#?code=DYUwLgBAlgdssggMwgYwIbGAI3ag1hALwCwAUBJcgK4wQAUAlBALQB85VXEA3gD4RO3YQBUQAZ0hEadJqzYQADgCdYYJHQBEYyZqHCuAEQD2AOWNgAFrADmxGQ2btH+7nwC+rrnwUYsuAnJyUEgAD3t6FEjaCHDnUIA6HTAmRkYgA&html=Q&css=Q

Expected and actual results

To be honest I don't really understand why the Javascript code is invalid, it looks fine to me but it appears to be some edge case around calling functions directly on raw objects as when I manually change the output to:

export const x = () => {
    let y = {
        DoNothing: () => {
        },
        Test: () => {
            toConsole(printf("Test"));
        },
    };
    y.Test();
};

The interpreter is accepts it.

Related information

• Fable version: 4.5, 4.6

[MangelMaxime]

Generated code should probably have some parentheses:

export const x = () => {
    ({
        DoNothing: () => {
        },
        Test: () => {
			toConsole(printf("Test"));
        }
    }).Test();
};