Merge #4521 #4522

4521: Use snippets in add_function r=matklad a=matklad

bors r+
🤖

4522: Explain the purpose of `ast::make` module more clearly r=matklad a=matklad



bors r+
🤖

Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>

Author: bors[bot]

crates/ra_assists/src/handlers/add_explicit_type.rs

@@ -25,9 +25,8 @@ pub(crate) fn add_explicit_type(acc: &mut Assists, ctx: &AssistContext) -> Optio
     let stmt = ctx.find_node_at_offset::<LetStmt>()?;
     let module = ctx.sema.scope(stmt.syntax()).module()?;
     let expr = stmt.initializer()?;
-    let pat = stmt.pat()?;
     // Must be a binding
-    let pat = match pat {
+    let pat = match stmt.pat()? {
         ast::Pat::BindPat(bind_pat) => bind_pat,
         _ => return None,
     };
@@ -46,7 +45,7 @@ pub(crate) fn add_explicit_type(acc: &mut Assists, ctx: &AssistContext) -> Optio
     // Assist not applicable if the type has already been specified
     // and it has no placeholders
     let ascribed_ty = stmt.ascribed_type();
-    if let Some(ref ty) = ascribed_ty {
+    if let Some(ty) = &ascribed_ty {
         if ty.syntax().descendants().find_map(ast::PlaceholderType::cast).is_none() {
             return None;
         }

crates/ra_assists/src/handlers/add_from_impl_for_enum.rs

@@ -1,6 +1,5 @@
 use ra_ide_db::RootDatabase;
 use ra_syntax::ast::{self, AstNode, NameOwner};
-use stdx::format_to;
 use test_utils::tested_by;
 
 use crate::{utils::FamousDefs, AssistContext, AssistId, Assists};
@@ -35,7 +34,7 @@ pub(crate) fn add_from_impl_for_enum(acc: &mut Assists, ctx: &AssistContext) ->
     }
     let field_type = field_list.fields().next()?.type_ref()?;
     let path = match field_type {
-        ast::TypeRef::PathType(p) => p,
+        ast::TypeRef::PathType(it) => it,
         _ => return None,
     };
 
@@ -51,9 +50,7 @@ pub(crate) fn add_from_impl_for_enum(acc: &mut Assists, ctx: &AssistContext) ->
         target,
         |edit| {
             let start_offset = variant.parent_enum().syntax().text_range().end();
-            let mut buf = String::new();
-            format_to!(
-                buf,
+            let buf = format!(
                 r#"
 
 impl From<{0}> for {1} {{