Fix incorrect suggestion when calling an associated type with a type anchor

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -724,7 +724,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             {
                 let def_path = tcx.def_path_str(adt_def.did());
                 err.span_suggestion(
-                    ty.span.to(item_ident.span),
+                    sugg_span,
                     format!("to construct a value of type `{}`, use the explicit path", def_path),
                     def_path,
                     Applicability::MachineApplicable,

tests/ui/associated-types/associated-type-call.fixed

@@ -14,7 +14,7 @@ impl Trait for () {
     type Assoc = T;
 
     fn f() {
-        <T();
+        T();
         //~^ ERROR no associated item named `Assoc` found for unit type `()` in the current scope
     }
 }

tests/ui/associated-types/associated-type-call.stderr

@@ -7,7 +7,7 @@ LL |         <Self>::Assoc();
 help: to construct a value of type `T`, use the explicit path
    |
 LL -         <Self>::Assoc();
-LL +         <T();
+LL +         T();
    |
 
 error: aborting due to 1 previous error