Resolve infered types when complaining about unexpected call type

src/test/ui/typeck/call-block.rs

@@ -1,3 +1,3 @@
 fn main() {
-    let _ = {42}(); //~ ERROR expected function, found `_`
+    let _ = {42}(); //~ ERROR expected function, found `{integer}`
 }

src/test/ui/typeck/call-block.stderr

@@ -1,4 +1,4 @@
-error[E0618]: expected function, found `_`
+error[E0618]: expected function, found `{integer}`
   --> $DIR/call-block.rs:2:13
    |
 LL |     let _ = {42}();