Invalid error (E0425) reported

[GuillaumeGomez]

In the following code:

fn main() {
    let foo = 42u32;
    const FOO : u32 = foo;
}

We have the following errors:

<anon>:3:23: 3:26 error: attempt to use a non-constant value in a constant [E0435]
<anon>:3     const FOO : u32 = foo;
                               ^~~
<anon>:3:23: 3:26 error: unresolved name `foo` [E0425]
<anon>:3     const FOO : u32 = foo;

The first one is "normal", however, the E0425 might mislead developer's understanding on this error.

cc @eddyb

[eddyb]

IMO the second error is fine, because the local foo variable is not in scope for the FOO constant item.
The first one could be a note instead of an error and rephrased, perhaps.

[brson]

Current output:

fn main() {
    let foo = 42u32;
    const FOO : u32 = foo;
}

Seems fixed cc @GuillaumeGomez

[brson]

Just add test.

[GuillaumeGomez]

@brson: Do you have the PR which fixed this issue by any chance? (so I can add the test accordingly to it if still needed)

[brson]

@GuillaumeGomez no I do not. I just noticed that the op is working.

[estebank]

@brson test merged, this issue can be closed.