Use name resolution for goto definition

crates/ra_hir/src/expr.rs

@@ -762,7 +762,7 @@ pub(crate) fn body_syntax_mapping(
     let def = def_id.resolve(db)?;
 
     let body_syntax_mapping = match def {
-        Def::Function(f) => collect_fn_body_syntax(&f.source(db)),
+        Def::Function(f) => collect_fn_body_syntax(&f.source(db)?.1),
         // TODO: consts, etc.
         _ => panic!("Trying to get body for item type without body"),
     };