Don't escape 'static

As it is a valid lifetime without escaping.

It does need to be escaped as a label, but we have no way to distinguish that.

crates/hir-expand/src/name.rs

@@ -207,6 +207,14 @@ struct Display<'a> {
 impl fmt::Display for Display<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let mut symbol = self.name.symbol.as_str();
+
+        if symbol == "'static" {
+            // FIXME: '`static` can also be a label, and there it does need escaping.
+            // But knowing where it is will require adding a parameter to `display()`,
+            // and that is an infectious change.
+            return f.write_str(symbol);
+        }
+
         if let Some(s) = symbol.strip_prefix('\'') {
             f.write_str("'")?;
             symbol = s;

crates/ide-completion/src/completions/lifetime.rs

@@ -116,13 +116,13 @@ fn foo<'lifetime>(foo: &'a$0) {}
         check(
             r#"
 struct Foo;
-impl<'impl> Foo {
+impl<'r#impl> Foo {
     fn foo<'func>(&'a$0 self) {}
 }
 "#,
             expect![[r#"
                 lt 'func
-                lt 'impl
+                lt 'r#impl
                 lt 'static
             "#]],
         );