Clippy lint: single-character string constant

crates/ra_analysis/src/imp.rs

@@ -388,7 +388,7 @@ impl AnalysisImpl {
                                     .text()
                                     .slice(range_search)
                                     .to_string()
-                                    .matches(",")
+                                    .matches(',')
                                     .count();
 
                                 // If we have a method call eat the first param since it's just self.

crates/ra_editor/src/extend_selection.rs

@@ -63,7 +63,7 @@ fn extend_ws(root: SyntaxNodeRef, ws: SyntaxNodeRef, offset: TextUnit) -> TextRa
     let prefix = TextRange::from_to(ws.range().start(), offset) - ws.range().start();
     let ws_suffix = &ws_text.as_str()[suffix];
     let ws_prefix = &ws_text.as_str()[prefix];
-    if ws_text.contains("\n") && !ws_suffix.contains("\n") {
+    if ws_text.contains('\n') && !ws_suffix.contains('\n') {
         if let Some(node) = ws.next_sibling() {
             let start = match ws_prefix.rfind('\n') {
                 Some(idx) => ws.range().start() + TextUnit::from((idx + 1) as u32),

crates/ra_lsp_server/src/main_loop/handlers.rs

@@ -160,8 +160,8 @@ pub fn handle_workspace_symbol(
     params: req::WorkspaceSymbolParams,
     token: JobToken,
 ) -> Result<Option<Vec<SymbolInformation>>> {
-    let all_symbols = params.query.contains("#");
-    let libs = params.query.contains("*");
+    let all_symbols = params.query.contains('#');
+    let libs = params.query.contains('*');
     let query = {
         let query: String = params
             .query

crates/tools/src/lib.rs

@@ -50,7 +50,7 @@ pub fn collect_tests(s: &str) -> Vec<(usize, Test)> {
             block.map(|(_, line)| line).chain(::std::iter::once("")),
             "\n",
         );
-        assert!(!text.trim().is_empty() && text.ends_with("\n"));
+        assert!(!text.trim().is_empty() && text.ends_with('\n'));
         res.push((start_line, Test { name, text }))
     }
     res