More documentation

rust_compiler/libs/helpers/src/lib.rs

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+mod macros;
+
+/// This trait will allow the LSP to emit documentation for various tokens and expressions.
+/// You can easily create documentation for large enums with the `documented!` macro.
+pub trait Documentation {
+    /// Retreive documentation for this specific item.
+    fn docs(&self) -> String;
+}
+
+pub mod prelude {
+    pub use super::{Documentation, documented};
+}