match on chars instead of &strs for .split() or .strip_prefix()

4 files changed, 6 insertions, 6 deletions

diff --git a/compiler/rustc_hir_typeck/src/upvar.rs b/compiler/rustc_hir_typeck/src/upvar.rs
index fb81a8395d7..22fe823acb7 100644
--- a/compiler/rustc_hir_typeck/src/upvar.rs
+++ b/compiler/rustc_hir_typeck/src/upvar.rs
@@ -932,7 +932,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         var_hir_id: hir::HirId,
         closure_clause: hir::CaptureBy,
     ) -> Option<FxIndexMap<UpvarMigrationInfo, UnordSet<&'static str>>> {
-        let auto_traits_def_id = vec![
+        let auto_traits_def_id = [
             self.tcx.lang_items().clone_trait(),
             self.tcx.lang_items().sync_trait(),
             self.tcx.get_diagnostic_item(sym::Send),
diff --git a/compiler/rustc_middle/src/traits/solve/inspect/format.rs b/compiler/rustc_middle/src/traits/solve/inspect/format.rs
index f19f1189e44..d0d2080b6a1 100644
--- a/compiler/rustc_middle/src/traits/solve/inspect/format.rs
+++ b/compiler/rustc_middle/src/traits/solve/inspect/format.rs
@@ -15,11 +15,11 @@ struct Indentor<'a, 'b> {
 
 impl Write for Indentor<'_, '_> {
     fn write_str(&mut self, s: &str) -> std::fmt::Result {
-        for line in s.split_inclusive("\n") {
+        for line in s.split_inclusive('\n') {
             if self.on_newline {
                 self.f.write_str("    ")?;
             }
-            self.on_newline = line.ends_with("\n");
+            self.on_newline = line.ends_with('\n');
             self.f.write_str(line)?;
         }
 
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index a8147ede970..36b5c385ab1 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -279,11 +279,11 @@ impl LinkSelfContained {
         // set of all values like `y` or `n` used to be. Therefore, if this flag had previously been
         // set in bulk with its historical values, then manually setting a component clears that
         // `explicitly_set` state.
-        if let Some(component_to_enable) = component.strip_prefix("+") {
+        if let Some(component_to_enable) = component.strip_prefix('+') {
             self.explicitly_set = None;
             self.components.insert(component_to_enable.parse()?);
             Ok(())
-        } else if let Some(component_to_disable) = component.strip_prefix("-") {
+        } else if let Some(component_to_disable) = component.strip_prefix('-') {
             self.explicitly_set = None;
             self.components.remove(component_to_disable.parse()?);
             Ok(())
diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index 39efe9abeec..ff433fdf16d 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -1145,7 +1145,7 @@ mod parse {
         }
 
         // 2. Parse a list of enabled and disabled components.
-        for comp in s.split(",") {
+        for comp in s.split(',') {
             if slot.handle_cli_component(comp).is_err() {
                 return false;
             }