Rollup merge of #91880 - matthiaskrgr:clippy_perf_dec, r=jyn514

fix clippy::single_char_pattern perf findings

4 files changed, 9 insertions, 9 deletions

diff --git a/src/librustdoc/html/render/cache.rs b/src/librustdoc/html/render/cache.rs
index 2f7214e958e..631eacc9618 100644
--- a/src/librustdoc/html/render/cache.rs
+++ b/src/librustdoc/html/render/cache.rs
@@ -184,8 +184,8 @@ crate fn build_index<'tcx>(krate: &clean::Crate, cache: &mut Cache, tcx: TyCtxt<
         })
         .expect("failed serde conversion")
         // All these `replace` calls are because we have to go through JS string for JSON content.
-        .replace(r"\", r"\\")
-        .replace("'", r"\'")
+        .replace(r#"\"#, r"\\")
+        .replace(r#"'"#, r"\'")
         // We need to escape double quotes for the JSON.
         .replace("\\\"", "\\\\\"")
     )
diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index 166e0840127..c67fe1fef40 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -989,7 +989,7 @@ fn attributes(it: &clean::Item) -> Vec<String> {
         .iter()
         .filter_map(|attr| {
             if ALLOWED_ATTRIBUTES.contains(&attr.name_or_empty()) {
-                Some(pprust::attribute_to_string(attr).replace("\n", "").replace("  ", " "))
+                Some(pprust::attribute_to_string(attr).replace('\n', "").replace("  ", " "))
             } else {
                 None
             }
diff --git a/src/librustdoc/passes/collect_intra_doc_links.rs b/src/librustdoc/passes/collect_intra_doc_links.rs
index 4e5812d7f84..2faf7781807 100644
--- a/src/librustdoc/passes/collect_intra_doc_links.rs
+++ b/src/librustdoc/passes/collect_intra_doc_links.rs
@@ -963,7 +963,7 @@ fn preprocess_link<'a>(
         return None;
     }
 
-    let stripped = ori_link.link.replace("`", "");
+    let stripped = ori_link.link.replace('`', "");
     let mut parts = stripped.split('#');
 
     let link = parts.next().unwrap();
diff --git a/src/librustdoc/theme.rs b/src/librustdoc/theme.rs
index b8b3f9634e5..1e9a65e1d2f 100644
--- a/src/librustdoc/theme.rs
+++ b/src/librustdoc/theme.rs
@@ -173,11 +173,11 @@ fn build_rule(v: &[u8], positions: &[usize]) -> String {
             .map(|x| ::std::str::from_utf8(&v[x[0]..x[1]]).unwrap_or(""))
             .collect::<String>()
             .trim()
-            .replace("\n", " ")
-            .replace("/", "")
-            .replace("\t", " ")
-            .replace("{", "")
-            .replace("}", "")
+            .replace('\n', " ")
+            .replace('/', "")
+            .replace('\t', " ")
+            .replace('{', "")
+            .replace('}', "")
             .split(' ')
             .filter(|s| !s.is_empty())
             .collect::<Vec<&str>>()