Merge #1257

1257: Implemented tkn! macro for syntax kinds r=matklad a=pasa

Implementation of #1248

Co-authored-by: Sergey Parilin <sergey.parilin@fxdd.com>

crates/ra_syntax/src/lib.rs

@@ -33,6 +33,7 @@ pub mod fuzz;
 
 pub use rowan::{SmolStr, TextRange, TextUnit};
 pub use ra_parser::SyntaxKind;
+pub use ra_parser::T;
 pub use crate::{
     ast::AstNode,
     syntax_error::{SyntaxError, SyntaxErrorKind, Location},