Auto merge of #60537 - Centril:rollup-42jxz82, r=Centril

Rollup of 9 pull requests

Successful merges:

 - #60429 (Account for paths in incorrect pub qualifier help)
 - #60449 (Constrain all regions in the concrete type for an opaque type)
 - #60486 (Place related refactors)
 - #60513 (Remove -Z borrowck=compare flag)
 - #60516 (Remove TypeckMir)
 - #60517 (Reword casting message)
 - #60520 (Add rustfmt toml)
 - #60521 (Migrate tidy to rust 2018 edition)
 - #60527 (Fix async fn lowering ICE with APIT.)

Failed merges:

r? @ghost

Author: bors

rustfmt.toml

@@ -0,0 +1,6 @@
+# Currently, most of the code in the compiler uses historical style.
+#
+# For new code, consider running rustfmt with this config (it should
+# be picked up automatically).
+version = "Two"
+use_small_heuristics = "Max"

src/librustc/hir/map/def_collector.rs

@@ -92,10 +92,12 @@ impl<'a> DefCollector<'a> {
             visit::walk_generics(this, generics);
 
             // Walk the generated arguments for the `async fn`.
-            for a in arguments {
+            for (i, a) in arguments.iter().enumerate() {
                 use visit::Visitor;
                 if let Some(arg) = &a.arg {
                     this.visit_ty(&arg.ty);
+                } else {
+                    this.visit_ty(&decl.inputs[i].ty);
                 }
             }