Use MultiSpan in E0707 and E709

Author: Esteban Küber

src/librustc/hir/lowering.rs

@@ -72,7 +72,7 @@ use syntax::tokenstream::{Delimited, TokenStream, TokenTree};
 use syntax::parse::token::Token;
 use syntax::util::small_vector::SmallVector;
 use syntax::visit::{self, Visitor};
-use syntax_pos::Span;
+use syntax_pos::{Span, MultiSpan};
 
 const HIR_ID_COUNTER_LOCKED: u32 = 0xFFFFFFFF;
 
@@ -2049,7 +2049,7 @@ impl<'a> LoweringContext<'a> {
                         if current_lt_name != name {
                             struct_span_err!(
                                 self.context.sess,
-                                current_lt_span.between(lifetime.span),
+                                MultiSpan::from_spans(vec![current_lt_span, lifetime.span]),
                                 E0709,
                                 "multiple different lifetimes used in arguments of `async fn`",
                             )
@@ -2061,7 +2061,7 @@ impl<'a> LoweringContext<'a> {
                         } else if current_lt_name.is_elided() && name.is_elided() {
                             struct_span_err!(
                                 self.context.sess,
-                                current_lt_span.between(lifetime.span),
+                                MultiSpan::from_spans(vec![current_lt_span, lifetime.span]),
                                 E0707,
                                 "multiple elided lifetimes used in arguments of `async fn`",
                             )

src/test/ui/async-fn-multiple-lifetimes.stderr

@@ -1,8 +1,8 @@
 error[E0709]: multiple different lifetimes used in arguments of `async fn`
-  --> $DIR/async-fn-multiple-lifetimes.rs:17:49
+  --> $DIR/async-fn-multiple-lifetimes.rs:17:47
    |
 LL | async fn multiple_named_lifetimes<'a, 'b>(_: &'a u8, _: &'b u8) {}
-   |                                               --^^^^^^^^^-- different lifetime here
+   |                                               ^^         ^^ different lifetime here
    |                                               |
    |                                               first lifetime here
    |
@@ -12,7 +12,7 @@ error[E0707]: multiple elided lifetimes used in arguments of `async fn`
   --> $DIR/async-fn-multiple-lifetimes.rs:26:39
    |
 LL | async fn multiple_elided_lifetimes(_: &u8, _: &u8) {}
-   |                                       -^^^^^^^- different lifetime here
+   |                                       ^       ^ different lifetime here
    |                                       |
    |                                       first lifetime here
    |