'Cannot find value in this scope' on macro expansion with generic over const impl block inside.

[L117]

I kinda hoped that snippet below will be compiled:

#![feature(const_generics)]

use std::ops::Add;

struct VectorLike<T, const SIZE: usize>([T; {SIZE}]);

macro_rules! impl_operator_overload {
    ($trait_ident:ident, $method_ident:ident) => {
    
        impl<T, const SIZE: usize> $trait_ident for VectorLike<T, {SIZE}> 
        where
            T: $trait_ident,
        {
            type Output = VectorLike<T, {SIZE}>;
            
            fn $method_ident(self, _: VectorLike<T, {SIZE}>) -> VectorLike<T, {SIZE}> {
                unimplemented!()
            }
        }
        
    }
}

impl_operator_overload!(Add, add);

Instead I got a bunch of errors like

error[E0425]: cannot find value `SIZE` in this scope

for SIZE in every occurrence of {SIZE} inside macro body, and one

the const parameter `SIZE` is not constrained by the impl trait, self type, or predicates

for SIZE in impl<T, const SIZE: usize>.

Playground permalink

Unlike snippet with "const variable" above, this one with "const value" compiles without any
issues:

#![feature(const_generics)]

use std::ops::Add;

struct VectorLike<T, const SIZE: usize>([T; {SIZE}]);

macro_rules! impl_operator_overload {
    ($trait_ident:ident, $method_ident:ident) => {
    
        impl<T> $trait_ident for VectorLike<T, 3> 
        where
            T: $trait_ident,
        {
            type Output = VectorLike<T, 3>;
            
            fn $method_ident(self, _: VectorLike<T, 3>) -> VectorLike<T, 3> {
                unimplemented!()
            }
        }
        
    }
}

impl_operator_overload!(Add, add);

This issue seems to be related to #58307.

Rustc version: 1.37.0-nightly (2019-06-04 5d8f59f4b1473217c2de).

[c410-f3r]

Minimal code:

macro_rules! some_macro {
    ($struct_name:ident) => {
        struct $struct_name<const N: usize>([usize; N]);
    }
}
some_macro!(Foo);