Fix how we get span of the PathSegment separator

src/types.rs

@@ -229,8 +229,14 @@ fn rewrite_segment(
  .chain(data.bindings.iter().map(|x| SegmentParam::Binding(&*x)))
  .collect::<Vec<_>>();
 
- let force_separator =
- context.inside_macro() && context.snippet(data.span).starts_with("::");
+ // HACK: squeeze out the span between the identifier and the parameters.
+ // The hack is requried so that we don't remove the separator inside macro calls.
+ // This does not work in the presence of comment, hoping that people are
+ // sane about where to put their comment.
+ let separator_snippet = context
+ .snippet(mk_sp(segment.ident.span.hi(), data.span.lo()))
+ .trim();
+ let force_separator = context.inside_macro() && separator_snippet.starts_with("::");
  let separator = if path_context == PathContext::Expr || force_separator {
  "::"
  } else {