Function rustc_resolve::diagnostics::extend_span_to_previous_binding

pub(crate) fn extend_span_to_previous_binding(
    sess: &Session, 
    binding_span: Span
) -> Option<Span>

Given a binding_span, return the span through to the comma or opening brace of the previous binding.

use foo::a::{a, b, c};
              ^^--- binding span
              |
              returned span

use foo::{a, b, c};
          --- binding span