7 files changed, 45 insertions, 2 deletions

diff --git a/crates/ra_assists/src/assists/add_derive.rs b/crates/ra_assists/src/assists/add_derive.rs
index d3ba634c4..b077acb81 100644
--- a/crates/ra_assists/src/assists/add_derive.rs
+++ b/crates/ra_assists/src/assists/add_derive.rs
@@ -8,7 +8,9 @@ use ra_syntax::{
 use crate::{Assist, AssistCtx, AssistId};
 
 // Assist: add_derive
+//
 // Adds a new `#[derive()]` clause to a struct or enum.
+//
 // ```
 // struct Point {
 //     x: u32,
diff --git a/crates/ra_assists/src/assists/add_explicit_type.rs b/crates/ra_assists/src/assists/add_explicit_type.rs
index 33b7bea7f..302b95579 100644
--- a/crates/ra_assists/src/assists/add_explicit_type.rs
+++ b/crates/ra_assists/src/assists/add_explicit_type.rs
@@ -7,7 +7,9 @@ use ra_syntax::{
 use crate::{Assist, AssistCtx, AssistId};
 
 // Assist: add_explicit_type
+//
 // Specify type for a let binding
+//
 // ```
 // fn main() {
 //     let x<|> = 92;
diff --git a/crates/ra_assists/src/assists/add_impl.rs b/crates/ra_assists/src/assists/add_impl.rs
index 40bc5c464..43aeac7bd 100644
--- a/crates/ra_assists/src/assists/add_impl.rs
+++ b/crates/ra_assists/src/assists/add_impl.rs
@@ -9,7 +9,9 @@ use ra_syntax::{
 use crate::{Assist, AssistCtx, AssistId};
 
 // Assist: add_impl
+//
 // Adds a new inherent impl for a type
+//
 // ```
 // struct Ctx<T: Clone> {
 //      data: T,<|>
diff --git a/crates/ra_assists/src/assists/add_missing_impl_members.rs b/crates/ra_assists/src/assists/add_missing_impl_members.rs
index 36fa6f9ea..fe1f2e72e 100644
--- a/crates/ra_assists/src/assists/add_missing_impl_members.rs
+++ b/crates/ra_assists/src/assists/add_missing_impl_members.rs
@@ -13,7 +13,9 @@ enum AddMissingImplMembersMode {
 }
 
 // Assist: add_impl_missing_members
+//
 // Adds scaffold for required impl members
+//
 // ```
 // trait T {
 //     Type X;
diff --git a/crates/ra_assists/src/assists/apply_demorgan.rs b/crates/ra_assists/src/assists/apply_demorgan.rs
index a072f63e7..75144cefe 100644
--- a/crates/ra_assists/src/assists/apply_demorgan.rs
+++ b/crates/ra_assists/src/assists/apply_demorgan.rs
@@ -5,11 +5,13 @@ use ra_syntax::SyntaxNode;
 use crate::{Assist, AssistCtx, AssistId};
 
 // Assist: apply_demorgan
+//
 // Apply [De Morgan's law](https://en.wikipedia.org/wiki/De_Morgan%27s_laws).
 // This transforms expressions of the form `!l || !r` into `!(l && r)`.
 // This also works with `&&`. This assist can only be applied with the cursor
 // on either `||` or `&&`, with both operands being a negation of some kind.
 // This means something of the form `!x` or `x != y`.
+//
 // ```
 // fn main() {
 //     if x != 4 ||<|> !y {}
diff --git a/crates/ra_assists/src/assists/change_visibility.rs b/crates/ra_assists/src/assists/change_visibility.rs
index df92c6b67..88118cdf7 100644
--- a/crates/ra_assists/src/assists/change_visibility.rs
+++ b/crates/ra_assists/src/assists/change_visibility.rs
@@ -1,5 +1,3 @@
-//! FIXME: write short doc here
-
 use hir::db::HirDatabase;
 use ra_syntax::{
     ast::{self, NameOwner, VisibilityOwner},
@@ -13,6 +11,17 @@ use ra_syntax::{
 
 use crate::{Assist, AssistCtx, AssistId};
 
+// Assist: change_visibility
+//
+// Adds or changes existing visibility specifier.
+//
+// ```
+// fn<|> frobnicate() {}
+// ```
+// ->
+// ```
+// pub(crate) fn frobnicate() {}
+// ```
 pub(crate) fn change_visibility(ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
     if let Some(vis) = ctx.node_at_offset::<ast::Visibility>() {
         return change_vis(ctx, vis);
diff --git a/crates/ra_assists/src/assists/fill_match_arms.rs b/crates/ra_assists/src/assists/fill_match_arms.rs
index e3f30b5de..13b98d033 100644
--- a/crates/ra_assists/src/assists/fill_match_arms.rs
+++ b/crates/ra_assists/src/assists/fill_match_arms.rs
@@ -7,6 +7,30 @@ use ra_syntax::ast::{self, edit::IndentLevel, make, AstNode, NameOwner};
 
 use crate::{Assist, AssistCtx, AssistId};
 
+// Assist: fill_match_arms
+//
+// Adds missing clauses to a `match` expression.
+//
+// ```
+// enum Action { Move { distance: u32 }, Stop }
+//
+// fn handle(action: Action) {
+//     match action {
+//         <|>
+//     }
+// }
+// ```
+// ->
+// ```
+// enum Action { Move { distance: u32 }, Stop }
+//
+// fn handle(action: Action) {
+//     match action {
+//         Action::Move{ distance } => (),
+//         Action::Stop => (),
+//     }
+// }
+// ```
 pub(crate) fn fill_match_arms(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
     let match_expr = ctx.node_at_offset::<ast::MatchExpr>()?;
     let match_arm_list = match_expr.match_arm_list()?;