from method provided by core::convert::From is not extracted to the same name if it passed as a closure

[maximebuyse]

struct A();

impl From<()> for A {
    fn from(x: ()) -> A {
        A()
    }
}

fn test(x: Option<()>) -> Option<A> {
    match x {
        Some(v) => Some(A::from(v)),
        None => None
    }
}
fn test2(x: Option<()>) -> Option<A> {
    x.map(A::from)
}

Open this code snippet in the playground

In the example above, from of test is extracted as Core.Convert.f_from in f* (which is provided by our Core lib. But in test2 it yields Core.Convert.From.from which we don't have

[W95Psp]

I think this is #991

[franziskuskiefer]

Use the following workaround for now

fn test2(x: Option<()>) -> Option<A> {
    x.map(|v| A::from(v))
}