expected type 'fn() type', found 'fn() var' - only one is generic

[markfirmware]

I can't figure out what is wrong here. a() should return the function b() which itself returns a type (here an empty struct.)

./aaa.zig:10:7: error: expected type 'fn() type', found 'fn() var'
    }).b;
      ^
./aaa.zig:10:7: note: only one of the functions is generic
    }).b;
      ^


pub fn main() void {
    _ = a();
}

fn a() fn () type {
    return (struct {
        pub fn b() type {
            return struct {};
        }
    }).b;

[hiroakitakada]

A similar error occurs with the following code (comes from #5817).

fn comptime_add1(comptime x: u32) u32 {
    return x + 1;
}

fn apply(func: fn(u32) u32, x: u32) u32 {
    return func(x);
}

export var v1 = apply(comptime_add1, 1);

This code gets a compile error saying expected type 'fn(u32) u32', found 'fn(u32) var'.