Enable extra warnings required by rust-lang/rust

crates/text-edit/src/lib.rs

@@ -4,6 +4,8 @@
 //! so `TextEdit` is the ultimate representation of the work done by
 //! rust-analyzer.
 
+#![warn(rust_2018_idioms, unused_lifetimes, semicolon_in_expressions_from_macros)]
+
 use itertools::Itertools;
 use std::cmp::max;
 pub use text_size::{TextRange, TextSize};