From 8a671168576b9b552a22be285646fc293a80d8c2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matthias=20Kr=C3=BCger?= <matthias.krueger@famsik.de>
Date: Sun, 21 Mar 2021 12:38:21 +0100
Subject: use strip_prefix() instead of starts_with and slicing
 (clippy::manual_strip)

---
 crates/hir_expand/src/name.rs         |  5 ++---
 crates/syntax/src/ast/edit.rs         |  3 +--
 xtask/src/codegen/gen_assists_docs.rs |  4 ++--
 xtask/src/codegen/gen_parser_tests.rs | 10 ++++------
 4 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/crates/hir_expand/src/name.rs b/crates/hir_expand/src/name.rs
index 43de9edd6..0aeea48d5 100644
--- a/crates/hir_expand/src/name.rs
+++ b/crates/hir_expand/src/name.rs
@@ -48,9 +48,8 @@ impl Name {
 
     /// Resolve a name from the text of token.
     fn resolve(raw_text: &str) -> Name {
-        let raw_start = "r#";
-        if raw_text.starts_with(raw_start) {
-            Name::new_text(SmolStr::new(&raw_text[raw_start.len()..]))
+        if let Some(text) = raw_text.strip_prefix("r#") {
+            Name::new_text(SmolStr::new(text))
         } else {
             Name::new_text(raw_text.into())
         }
diff --git a/crates/syntax/src/ast/edit.rs b/crates/syntax/src/ast/edit.rs
index 64fac13a7..80be8b79c 100644
--- a/crates/syntax/src/ast/edit.rs
+++ b/crates/syntax/src/ast/edit.rs
@@ -333,8 +333,7 @@ impl ast::Use {
             .and_then(ast::Whitespace::cast);
         if let Some(next_ws) = next_ws {
             let ws_text = next_ws.syntax().text();
-            if ws_text.starts_with('\n') {
-                let rest = &ws_text[1..];
+            if let Some(rest) = ws_text.strip_prefix('\n') {
                 if rest.is_empty() {
                     res.delete(next_ws.syntax())
                 } else {
diff --git a/xtask/src/codegen/gen_assists_docs.rs b/xtask/src/codegen/gen_assists_docs.rs
index 158680993..c91716409 100644
--- a/xtask/src/codegen/gen_assists_docs.rs
+++ b/xtask/src/codegen/gen_assists_docs.rs
@@ -154,8 +154,8 @@ fn hide_hash_comments(text: &str) -> String {
 fn reveal_hash_comments(text: &str) -> String {
     text.split('\n') // want final newline
         .map(|it| {
-            if it.starts_with("# ") {
-                &it[2..]
+            if let Some(stripped) = it.strip_prefix("# ") {
+                stripped
             } else if it == "#" {
                 ""
             } else {
diff --git a/xtask/src/codegen/gen_parser_tests.rs b/xtask/src/codegen/gen_parser_tests.rs
index 096590653..2fecb9b5b 100644
--- a/xtask/src/codegen/gen_parser_tests.rs
+++ b/xtask/src/codegen/gen_parser_tests.rs
@@ -60,12 +60,10 @@ fn collect_tests(s: &str) -> Vec<Test> {
     let mut res = Vec::new();
     for comment_block in extract_comment_blocks(s) {
         let first_line = &comment_block[0];
-        let (name, ok) = if first_line.starts_with("test ") {
-            let name = first_line["test ".len()..].to_string();
-            (name, true)
-        } else if first_line.starts_with("test_err ") {
-            let name = first_line["test_err ".len()..].to_string();
-            (name, false)
+        let (name, ok) = if let Some(name) = first_line.strip_prefix("test ") {
+            (name.to_string(), true)
+        } else if let Some(name) = first_line.strip_prefix("test_err ") {
+            (name.to_string(), false)
         } else {
             continue;
         };
-- 
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