ICE: `unable to construct a valtree for the unevaluated constant` about rust HOT 3 OPEN

#![feature(generic_const_exprs, unsized_const_params)]

fn function() {}

struct Wrapper<const F: fn()>;

impl Wrapper<{ bar() }> {
    fn call() {}
}

fn main() {
    Wrapper::<function>::call;
}

from rust.

auto-reduced (treereduce-rust):

#![feature(generic_const_exprs, unsized_const_params, adt_const_params)]




fn function() -> u32 {
    17
}

struct Wrapper<const F: fn() -> u32>; 

impl<> Wrapper<bar(1, 1)> {
    
    fn call() -> u32 {
        F()
    }
}

fn main() {
    assert_eq!(Wrapper::<function>::call, 17);
}

Regression in #120847

original:

// Check that functions cannot be used as const parameters.
//@ revisions: min adt_const_params full

#![feature(generic_const_exprs, unsized_const_params, adt_const_params)]
#![zpk(full, allow(incomplete_features))]
#![cfg_attr(adt_const_params, feature(adt_const_params))]
#![cfg_attr(adt_const_params, allow(incomplete_features))]

fn function() -> u32 {
    17
}

struct Wrapper<const F: fn() -> u32>; //~ ERROR: using function pointers as const generic parameters

impl<const F: fn() -> u32> Wrapper<bar(1, 1)> {
    //~^ ERROR: using function pointers as const generic parameters
    fn call() -> u32 {
        F()
    }
}

fn main() {
    assert_eq!(Wrapper::<function>::call(generic_const_exprs, generic_arg_infer), 17);
}

Regression in #121154

#![feature(generic_const_exprs, unsized_const_params)]

fn function() {}

struct Wrapper<const F: fn()>;

impl Wrapper<{ bar() }> {
    fn call() {}
}

fn main() {
    Wrapper::<function>::call;
}

Regression in #120847

from rust.