Macros 2.0 - weird error

help
1

Take the following program:

#![feature(decl_macro)]

mod c {
    pub mod a {
        pub mod b {
            pub macro foo() {
                super::super::Foo
            }
            
            fn foo() {
                super::super::Foo;
            }
        }
    }
    
    struct Foo;
}

fn main() {
    c::a::b::foo!();
}

It errors for the macro, but not for the function (Rust Playground):

error[E0425]: cannot find value `Foo` in module `super::super`
  --> src/main.rs:7:31
   |
7  |                 super::super::Foo
   |                               ^^^ help: a function with a similar name exists (notice the capitalization): `foo`
...
10 |             fn foo() {
   |             -------- similarly named function `foo` defined here
...
20 |     c::a::b::foo!();
   |     --------------- in this macro invocation
   |
note: unit struct `crate::c::Foo` exists but is inaccessible
  --> src/main.rs:16:5
   |
16 |     struct Foo;
   |     ^^^^^^^^^^^ not accessible
   = note: this error originates in the macro `c::a::b::foo` (in Nightly builds, run with -Z macro-backtrace for more info)

Can somebody explain this? I thought macros 2.0 invocation is supposed to behave "as if" it was written in the macro's module.

2

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