cleanup

Author: matklad

crates/ra_ide/src/goto_type_definition.rs

@@ -2,7 +2,7 @@
 
 use hir::db::AstDatabase;
 use ra_ide_db::RootDatabase;
-use ra_syntax::{ast, AstNode, SyntaxKind::*, SyntaxToken, TokenAtOffset};
+use ra_syntax::{ast, match_ast, AstNode, SyntaxKind::*, SyntaxToken, TokenAtOffset};
 
 use crate::{
     display::ToNav, expand::descend_into_macros, FilePosition, NavigationTarget, RangeInfo,
@@ -44,12 +44,12 @@ pub(crate) fn goto_type_definition(
     let token: SyntaxToken = sema.descend_into_macros(token);
 
     let (ty, node) = sema.ancestors_with_macros(token.parent()).find_map(|node| {
-        let ty = if let Some(expr) = ast::Expr::cast(node.clone()) {
-            sema.type_of_expr(&expr)?
-        } else if let Some(pat) = ast::Pat::cast(node.clone()) {
-            sema.type_of_pat(&pat)?
-        } else {
-            return None;
+        let ty = match_ast! {
+            match node {
+                ast::Expr(expr) => { sema.type_of_expr(&expr)? },
+                ast::Pat(pat) => { sema.type_of_pat(&pat)? },
+                _ => { return None },
+            }
         };
 
         Some((ty, node))