2 files changed, 43 insertions, 22 deletions

diff --git a/crates/ra_assists/src/handlers/merge_imports.rs b/crates/ra_assists/src/handlers/merge_imports.rs
index 0958f52f1..ef0ce0586 100644
--- a/crates/ra_assists/src/handlers/merge_imports.rs
+++ b/crates/ra_assists/src/handlers/merge_imports.rs
@@ -1,7 +1,7 @@
 use std::iter::successors;
 
 use ra_syntax::{
-    algo::{neighbor, SyntaxRewriter},
+    algo::{neighbor, skip_trivia_token, SyntaxRewriter},
     ast::{self, edit::AstNodeEdit, make},
     AstNode, Direction, InsertPosition, SyntaxElement, T,
 };
@@ -72,9 +72,18 @@ fn try_merge_trees(old: &ast::UseTree, new: &ast::UseTree) -> Option<ast::UseTre
     let lhs = old.split_prefix(&lhs_prefix);
     let rhs = new.split_prefix(&rhs_prefix);
 
+    let should_insert_comma = lhs
+        .use_tree_list()?
+        .r_curly_token()
+        .and_then(|it| skip_trivia_token(it.prev_token()?, Direction::Prev))
+        .map(|it| it.kind() != T![,])
+        .unwrap_or(true);
+
     let mut to_insert: Vec<SyntaxElement> = Vec::new();
-    to_insert.push(make::token(T![,]).into());
-    to_insert.push(make::tokens::single_space().into());
+    if should_insert_comma {
+        to_insert.push(make::token(T![,]).into());
+        to_insert.push(make::tokens::single_space().into());
+    }
     to_insert.extend(
         rhs.use_tree_list()?
             .syntax()
@@ -247,4 +256,22 @@ use {
 ",
         );
     }
+
+    #[test]
+    fn test_double_comma() {
+        check_assist(
+            merge_imports,
+            r"
+use foo::bar::baz;
+use foo::<|>{
+    FooBar,
+};
+",
+            r"
+use foo::{<|>
+    FooBar,
+bar::baz};
+",
+        )
+    }
 }
diff --git a/crates/ra_assists/src/handlers/reorder_fields.rs b/crates/ra_assists/src/handlers/reorder_fields.rs
index 692dd1315..5cbb98d73 100644
--- a/crates/ra_assists/src/handlers/reorder_fields.rs
+++ b/crates/ra_assists/src/handlers/reorder_fields.rs
@@ -1,20 +1,20 @@
 use std::collections::HashMap;
 
-use itertools::Itertools;
-
 use hir::{Adt, ModuleDef, PathResolution, Semantics, Struct};
+use itertools::Itertools;
 use ra_ide_db::RootDatabase;
 use ra_syntax::{
-    algo, ast,
-    ast::{Name, Path, RecordLit, RecordPat},
-    AstNode, SyntaxKind, SyntaxNode,
+    algo,
+    ast::{self, Path, RecordLit, RecordPat},
+    match_ast, AstNode, SyntaxKind,
+    SyntaxKind::*,
+    SyntaxNode,
 };
 
 use crate::{
     assist_ctx::{Assist, AssistCtx},
     AssistId,
 };
-use ra_syntax::ast::{Expr, NameRef};
 
 // Assist: reorder_fields
 //
@@ -59,7 +59,6 @@ fn reorder<R: AstNode>(ctx: AssistCtx) -> Option<Assist> {
 }
 
 fn get_fields_kind(node: &SyntaxNode) -> Vec<SyntaxKind> {
-    use SyntaxKind::*;
     match node.kind() {
         RECORD_LIT => vec![RECORD_FIELD],
         RECORD_PAT => vec![RECORD_FIELD_PAT, BIND_PAT],
@@ -68,19 +67,14 @@ fn get_fields_kind(node: &SyntaxNode) -> Vec<SyntaxKind> {
 }
 
 fn get_field_name(node: &SyntaxNode) -> String {
-    use SyntaxKind::*;
-    match node.kind() {
-        RECORD_FIELD => {
-            if let Some(name) = node.children().find_map(NameRef::cast) {
-                return name.to_string();
-            }
-            node.children().find_map(Expr::cast).map(|expr| expr.to_string()).unwrap_or_default()
-        }
-        BIND_PAT | RECORD_FIELD_PAT => {
-            node.children().find_map(Name::cast).map(|n| n.to_string()).unwrap_or_default()
+    let res = match_ast! {
+        match node {
+            ast::RecordField(field) => field.field_name().map(|it| it.to_string()),
+            ast::RecordFieldPat(field) => field.field_name().map(|it| it.to_string()),
+            _ => None,
         }
-        _ => String::new(),
-    }
+    };
+    res.unwrap_or_default()
 }
 
 fn get_fields(record: &SyntaxNode) -> Vec<SyntaxNode> {