Avoid naming variables str

This renames variables named `str` to other names, to make sure `str`
always refers to a type.

It's confusing to read code where `str` (or another standard type name)
is used as an identifier. It also produces misleading syntax
highlighting.

compiler/rustc_borrowck/src/region_infer/values.rs

@@ -544,12 +544,12 @@ fn pretty_print_region_elements(elements: impl IntoIterator<Item = RegionElement
 
     return result;
 
-    fn push_location_range(str: &mut String, location1: Location, location2: Location) {
+    fn push_location_range(s: &mut String, location1: Location, location2: Location) {
         if location1 == location2 {
-            str.push_str(&format!("{location1:?}"));
+            s.push_str(&format!("{location1:?}"));
         } else {
             assert_eq!(location1.block, location2.block);
-            str.push_str(&format!(
+            s.push_str(&format!(
                 "{:?}[{}..={}]",
                 location1.block, location1.statement_index, location2.statement_index
             ));

compiler/rustc_const_eval/src/interpret/operand.rs

@@ -704,8 +704,8 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
     pub fn read_str(&self, mplace: &MPlaceTy<'tcx, M::Provenance>) -> InterpResult<'tcx, &str> {
         let len = mplace.len(self)?;
         let bytes = self.read_bytes_ptr_strip_provenance(mplace.ptr(), Size::from_bytes(len))?;
-        let str = std::str::from_utf8(bytes).map_err(|err| err_ub!(InvalidStr(err)))?;
-        interp_ok(str)
+        let s = std::str::from_utf8(bytes).map_err(|err| err_ub!(InvalidStr(err)))?;
+        interp_ok(s)
     }
 
     /// Read from a local of the current frame. Convenience method for [`InterpCx::local_at_frame_to_op`].

compiler/rustc_const_eval/src/interpret/place.rs

@@ -1017,9 +1017,9 @@ where
     /// This is allocated in immutable global memory and deduplicated.
     pub fn allocate_str_dedup(
         &mut self,
-        str: &str,
+        s: &str,
     ) -> InterpResult<'tcx, MPlaceTy<'tcx, M::Provenance>> {
-        let bytes = str.as_bytes();
+        let bytes = s.as_bytes();
         let ptr = self.allocate_bytes_dedup(bytes)?;
 
         // Create length metadata for the string.

compiler/rustc_lint/src/nonstandard_style.rs

@@ -234,18 +234,18 @@ declare_lint! {
 declare_lint_pass!(NonSnakeCase => [NON_SNAKE_CASE]);
 
 impl NonSnakeCase {
-    fn to_snake_case(mut str: &str) -> String {
+    fn to_snake_case(mut name: &str) -> String {
         let mut words = vec![];
         // Preserve leading underscores
-        str = str.trim_start_matches(|c: char| {
+        name = name.trim_start_matches(|c: char| {
             if c == '_' {
                 words.push(String::new());
                 true
             } else {
                 false
             }
         });
-        for s in str.split('_') {
+        for s in name.split('_') {
             let mut last_upper = false;
             let mut buf = String::new();
             if s.is_empty() {

compiler/rustc_log/src/lib.rs

@@ -130,11 +130,11 @@ pub fn init_logger(cfg: LoggerConfig) -> Result<(), Error> {
 
     let subscriber = tracing_subscriber::Registry::default().with(filter).with(layer);
     match cfg.backtrace {
-        Ok(str) => {
+        Ok(backtrace_target) => {
             let fmt_layer = tracing_subscriber::fmt::layer()
                 .with_writer(io::stderr)
                 .without_time()
-                .event_format(BacktraceFormatter { backtrace_target: str });
+                .event_format(BacktraceFormatter { backtrace_target });
             let subscriber = subscriber.with(fmt_layer);
             tracing::subscriber::set_global_default(subscriber).unwrap();
         }

compiler/rustc_macros/src/symbols.rs

@@ -156,14 +156,14 @@ impl Entries {
         Entries { map: HashMap::with_capacity(capacity) }
     }
 
-    fn insert(&mut self, span: Span, str: &str, errors: &mut Errors) -> u32 {
-        if let Some(prev) = self.map.get(str) {
-            errors.error(span, format!("Symbol `{str}` is duplicated"));
+    fn insert(&mut self, span: Span, s: &str, errors: &mut Errors) -> u32 {
+        if let Some(prev) = self.map.get(s) {
+            errors.error(span, format!("Symbol `{s}` is duplicated"));
             errors.error(prev.span_of_name, "location of previous definition".to_string());
             prev.idx
         } else {
             let idx = self.len();
-            self.map.insert(str.to_string(), Preinterned { idx, span_of_name: span });
+            self.map.insert(s.to_string(), Preinterned { idx, span_of_name: span });
             idx
         }
     }
@@ -192,14 +192,14 @@ fn symbols_with_errors(input: TokenStream) -> (TokenStream, Vec<syn::Error>) {
     let mut entries = Entries::with_capacity(input.keywords.len() + input.symbols.len() + 10);
     let mut prev_key: Option<(Span, String)> = None;
 
-    let mut check_order = |span: Span, str: &str, errors: &mut Errors| {
+    let mut check_order = |span: Span, s: &str, errors: &mut Errors| {
         if let Some((prev_span, ref prev_str)) = prev_key {
-            if str < prev_str {
-                errors.error(span, format!("Symbol `{str}` must precede `{prev_str}`"));
+            if s < prev_str {
+                errors.error(span, format!("Symbol `{s}` must precede `{prev_str}`"));
                 errors.error(prev_span, format!("location of previous symbol `{prev_str}`"));
             }
         }
-        prev_key = Some((span, str.to_string()));
+        prev_key = Some((span, s.to_string()));
     };
 
     // Generate the listed keywords.

library/std/src/process.rs

@@ -1283,13 +1283,13 @@ impl fmt::Debug for Output {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         let stdout_utf8 = str::from_utf8(&self.stdout);
         let stdout_debug: &dyn fmt::Debug = match stdout_utf8 {
-            Ok(ref str) => str,
+            Ok(ref s) => s,
             Err(_) => &self.stdout,
         };
 
         let stderr_utf8 = str::from_utf8(&self.stderr);
         let stderr_debug: &dyn fmt::Debug = match stderr_utf8 {
-            Ok(ref str) => str,
+            Ok(ref s) => s,
             Err(_) => &self.stderr,
         };
 

library/std/src/sys/pal/windows/process.rs

@@ -142,11 +142,11 @@ impl AsRef<OsStr> for EnvKey {
     }
 }
 
-pub(crate) fn ensure_no_nuls<T: AsRef<OsStr>>(str: T) -> io::Result<T> {
-    if str.as_ref().encode_wide().any(|b| b == 0) {
+pub(crate) fn ensure_no_nuls<T: AsRef<OsStr>>(s: T) -> io::Result<T> {
+    if s.as_ref().encode_wide().any(|b| b == 0) {
         Err(io::const_error!(ErrorKind::InvalidInput, "nul byte found in provided data"))
     } else {
-        Ok(str)
+        Ok(s)
     }
 }
 

library/std/src/sys_common/wtf8.rs

@@ -204,8 +204,8 @@ impl Wtf8Buf {
     ///
     /// Since WTF-8 is a superset of UTF-8, this always succeeds.
     #[inline]
-    pub fn from_str(str: &str) -> Wtf8Buf {
-        Wtf8Buf { bytes: <[_]>::to_vec(str.as_bytes()), is_known_utf8: true }
+    pub fn from_str(s: &str) -> Wtf8Buf {
+        Wtf8Buf { bytes: <[_]>::to_vec(s.as_bytes()), is_known_utf8: true }
     }
 
     pub fn clear(&mut self) {

src/tools/compiletest/src/compute_diff.rs

@@ -31,7 +31,7 @@ pub fn make_diff(expected: &str, actual: &str, context_size: usize) -> Vec<Misma
 
     for result in diff::lines(expected, actual) {
         match result {
-            diff::Result::Left(str) => {
+            diff::Result::Left(s) => {
                 if lines_since_mismatch >= context_size && lines_since_mismatch > 0 {
                     results.push(mismatch);
                     mismatch = Mismatch::new(line_number - context_queue.len() as u32);
@@ -41,11 +41,11 @@ pub fn make_diff(expected: &str, actual: &str, context_size: usize) -> Vec<Misma
                     mismatch.lines.push(DiffLine::Context(line.to_owned()));
                 }
 
-                mismatch.lines.push(DiffLine::Expected(str.to_owned()));
+                mismatch.lines.push(DiffLine::Expected(s.to_owned()));
                 line_number += 1;
                 lines_since_mismatch = 0;
             }
-            diff::Result::Right(str) => {
+            diff::Result::Right(s) => {
                 if lines_since_mismatch >= context_size && lines_since_mismatch > 0 {
                     results.push(mismatch);
                     mismatch = Mismatch::new(line_number - context_queue.len() as u32);
@@ -55,18 +55,18 @@ pub fn make_diff(expected: &str, actual: &str, context_size: usize) -> Vec<Misma
                     mismatch.lines.push(DiffLine::Context(line.to_owned()));
                 }
 
-                mismatch.lines.push(DiffLine::Resulting(str.to_owned()));
+                mismatch.lines.push(DiffLine::Resulting(s.to_owned()));
                 lines_since_mismatch = 0;
             }
-            diff::Result::Both(str, _) => {
+            diff::Result::Both(s, _) => {
                 if context_queue.len() >= context_size {
                     let _ = context_queue.pop_front();
                 }
 
                 if lines_since_mismatch < context_size {
-                    mismatch.lines.push(DiffLine::Context(str.to_owned()));
+                    mismatch.lines.push(DiffLine::Context(s.to_owned()));
                 } else if context_size > 0 {
-                    context_queue.push_back(str);
+                    context_queue.push_back(s);
                 }
 
                 line_number += 1;