Revert global fmt config and use rustfmt::skip

rustfmt.toml

@@ -2,5 +2,5 @@ max_width = 120
 comment_width = 100
 match_block_trailing_comma = true
 wrap_comments = true
-edition = "2018"
+
 error_on_line_overflow = true

tests/ui/issue_4266.rs

@@ -2,6 +2,9 @@
 #![feature(async_await)]
 #![allow(dead_code)]
 
+// No edition 2018
+#[rustfmt::skip]
+mod m {
     async fn sink1<'a>(_: &'a str) {} // lint
     async fn sink1_elided(_: &str) {} // ok
 
@@ -34,5 +37,6 @@ impl Foo {
     async fn print(s: &str) {
         println!("{}", s);
     }
+}
 
 fn main() {}

tests/ui/issue_4266.stderr

@@ -1,5 +1,5 @@
 error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
-  --> $DIR/issue_4266.rs:5:1
+  --> $DIR/issue_4266.rs:8:5
    |
 LL |     async fn sink1<'a>(_: &'a str) {} // lint
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -7,12 +7,12 @@ LL | async fn sink1<'a>(_: &'a str) {} // lint
    = note: `-D clippy::needless-lifetimes` implied by `-D warnings`
 
 error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
-  --> $DIR/issue_4266.rs:9:1
+  --> $DIR/issue_4266.rs:12:5
    |
 LL | /     async fn one_to_one<'a>(s: &'a str) -> &'a str {
 LL | |         s
 LL | |     }
-   | |_^
+   | |_____^
 
 error: aborting due to 2 previous errors