Return a function from comptime

[steep haven]

do you mean something like this?

fn GenGeneric(comptime T: type) fn (T) void {
    return struct {
        fn generic(value: T) void {
            // ...
        }
    }.generic;
}

that would require the use of some kind of macro, which doesn't exist in zig

you could pass a function pas a parameter

but then that's kind of, well, redundant

what are you trying to achieve with this?

is this in some way an attempt at a bridge between the functional paradigm and the procedural?

well, a word of warning: zig is, in design, very strictly procedural, with very sparse functional elements

trying to use functional approaches doesn't tend to look or work as well as just using the procedural approach in zig, which is what it is designed around

[slow estuary]

I will also point out that TYPE { STATEMENTS; } is invalid syntax anyway.
TYPE { ... } is a structure literal, and cannot contain statements.

std.ArrayList(u8), as an example, is just calling std.ArrayList (a function) and returning a type, which can then be used as std.ArrayList(u8) { ... fields ... } if you wanted to.