From 5b2d52c8df5235fce9d2ae78adc3182a9659b268 Mon Sep 17 00:00:00 2001
From: Paulo Lieuthier <paulolieuthier@gmail.com>
Date: Sat, 19 Oct 2019 08:19:06 -0300
Subject: docs: describe new feature 'add custom impl for derived trait'

---
 crates/ra_assists/src/assists/add_custom_impl.rs | 17 +++++++++++++++++
 crates/ra_assists/src/doc_tests/generated.rs     | 19 +++++++++++++++++++
 2 files changed, 36 insertions(+)

(limited to 'crates/ra_assists/src')

diff --git a/crates/ra_assists/src/assists/add_custom_impl.rs b/crates/ra_assists/src/assists/add_custom_impl.rs
index 7e64cd902..037306fd6 100644
--- a/crates/ra_assists/src/assists/add_custom_impl.rs
+++ b/crates/ra_assists/src/assists/add_custom_impl.rs
@@ -12,6 +12,23 @@ use ra_syntax::{
 
 const DERIVE_TRAIT: &'static str = "derive";
 
+// Assist: add_custom_impl
+//
+// Adds impl block for derived trait.
+//
+// ```
+// #[derive(Deb<|>ug, Display)]
+// struct S;
+// ```
+// ->
+// ```
+// #[derive(Display)]
+// struct S;
+//
+// impl Debug for S {
+//
+// }
+// ```
 pub(crate) fn add_custom_impl(ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
     let input = ctx.find_node_at_offset::<ast::AttrInput>()?;
     let attr = input.syntax().parent().and_then(ast::Attr::cast)?;
diff --git a/crates/ra_assists/src/doc_tests/generated.rs b/crates/ra_assists/src/doc_tests/generated.rs
index 3c716c2d1..4586eeb59 100644
--- a/crates/ra_assists/src/doc_tests/generated.rs
+++ b/crates/ra_assists/src/doc_tests/generated.rs
@@ -2,6 +2,25 @@
 
 use super::check;
 
+#[test]
+fn doctest_add_custom_impl() {
+    check(
+        "add_custom_impl",
+        r#####"
+#[derive(Deb<|>ug, Display)]
+struct S;
+"#####,
+        r#####"
+#[derive(Display)]
+struct S;
+
+impl Debug for S {
+
+}
+"#####,
+    )
+}
+
 #[test]
 fn doctest_add_derive() {
     check(
-- 
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