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

fix clippy::single_char_pattern perf findings

2 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_mir_transform/src/coverage/debug.rs b/compiler/rustc_mir_transform/src/coverage/debug.rs
index 588103ca43d..c61ee6f7e6c 100644
--- a/compiler/rustc_mir_transform/src/coverage/debug.rs
+++ b/compiler/rustc_mir_transform/src/coverage/debug.rs
@@ -148,7 +148,7 @@ impl DebugOptions {
         let mut counter_format = ExpressionFormat::default();
 
         if let Ok(env_debug_options) = std::env::var(RUSTC_COVERAGE_DEBUG_OPTIONS) {
-            for setting_str in env_debug_options.replace(" ", "").replace("-", "_").split(',') {
+            for setting_str in env_debug_options.replace(' ', "").replace('-', "_").split(',') {
                 let (option, value) = match setting_str.split_once('=') {
                     None => (setting_str, None),
                     Some((k, v)) => (k, Some(v)),
diff --git a/compiler/rustc_mir_transform/src/coverage/spans.rs b/compiler/rustc_mir_transform/src/coverage/spans.rs
index 01e72a6c158..b5356a817f7 100644
--- a/compiler/rustc_mir_transform/src/coverage/spans.rs
+++ b/compiler/rustc_mir_transform/src/coverage/spans.rs
@@ -155,7 +155,7 @@ impl CoverageSpan {
         format!(
             "{}\n    {}",
             source_range_no_file(tcx, &self.span),
-            self.format_coverage_statements(tcx, mir_body).replace("\n", "\n    "),
+            self.format_coverage_statements(tcx, mir_body).replace('\n', "\n    "),
         )
     }