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-rw-r--r--compiler/rustc_span/src/analyze_source_file.rs4
-rw-r--r--compiler/rustc_span/src/lib.rs9
-rw-r--r--compiler/rustc_span/src/source_map.rs22
-rw-r--r--compiler/rustc_span/src/symbol.rs6
4 files changed, 27 insertions, 14 deletions
diff --git a/compiler/rustc_span/src/analyze_source_file.rs b/compiler/rustc_span/src/analyze_source_file.rs
index d3c2c5113bc..26cd54210d0 100644
--- a/compiler/rustc_span/src/analyze_source_file.rs
+++ b/compiler/rustc_span/src/analyze_source_file.rs
@@ -175,7 +175,7 @@ cfg_if::cfg_if! {
             // There might still be a tail left to analyze
             let tail_start = chunk_count * CHUNK_SIZE + intra_chunk_offset;
             if tail_start < src.len() {
-                analyze_source_file_generic(&src[tail_start as usize ..],
+                analyze_source_file_generic(&src[tail_start ..],
                                         src.len() - tail_start,
                                         output_offset + BytePos::from_usize(tail_start),
                                         lines,
@@ -219,7 +219,7 @@ fn analyze_source_file_generic(
     while i < scan_len {
         let byte = unsafe {
             // We verified that i < scan_len <= src.len()
-            *src_bytes.get_unchecked(i as usize)
+            *src_bytes.get_unchecked(i)
         };
 
         // How much to advance in order to get to the next UTF-8 char in the
diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
index 335bfc3302f..2181c090027 100644
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@@ -259,6 +259,10 @@ impl RealFileName {
             FileNameDisplayPreference::Remapped => {
                 self.remapped_path_if_available().to_string_lossy()
             }
+            FileNameDisplayPreference::Short => self
+                .local_path_if_available()
+                .file_name()
+                .map_or_else(|| "".into(), |f| f.to_string_lossy()),
         }
     }
 }
@@ -302,6 +306,9 @@ pub enum FileNameDisplayPreference {
     /// Display the path before the application of rewrite rules provided via `--remap-path-prefix`.
     /// This is appropriate for use in user-facing output (such as diagnostics).
     Local,
+    /// Display only the filename, as a way to reduce the verbosity of the output.
+    /// This is appropriate for use in user-facing output (such as diagnostics).
+    Short,
 }
 
 pub struct FileNameDisplay<'a> {
@@ -1381,7 +1388,7 @@ impl<S: Encoder> Encodable<S> for SourceFile {
                     4 => {
                         raw_diffs = Vec::with_capacity(bytes_per_diff * num_diffs);
                         for diff in diff_iter {
-                            raw_diffs.extend_from_slice(&(diff.0 as u32).to_le_bytes());
+                            raw_diffs.extend_from_slice(&(diff.0).to_le_bytes());
                         }
                     }
                     _ => unreachable!(),
diff --git a/compiler/rustc_span/src/source_map.rs b/compiler/rustc_span/src/source_map.rs
index 2ae57d9e56d..d9c87ac0ba8 100644
--- a/compiler/rustc_span/src/source_map.rs
+++ b/compiler/rustc_span/src/source_map.rs
@@ -15,11 +15,10 @@ pub use crate::*;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::stable_hasher::StableHasher;
 use rustc_data_structures::sync::{AtomicU32, Lrc, MappedReadGuard, ReadGuard, RwLock};
+use std::cmp;
 use std::hash::Hash;
 use std::path::{Path, PathBuf};
 use std::sync::atomic::Ordering;
-use std::{clone::Clone, cmp};
-use std::{convert::TryFrom, unreachable};
 
 use std::fs;
 use std::io;
@@ -439,7 +438,11 @@ impl SourceMap {
         }
     }
 
-    fn span_to_string(&self, sp: Span, filename_display_pref: FileNameDisplayPreference) -> String {
+    pub fn span_to_string(
+        &self,
+        sp: Span,
+        filename_display_pref: FileNameDisplayPreference,
+    ) -> String {
         if self.files.borrow().source_files.is_empty() || sp.is_dummy() {
             return "no-location".to_string();
         }
@@ -447,12 +450,15 @@ impl SourceMap {
         let lo = self.lookup_char_pos(sp.lo());
         let hi = self.lookup_char_pos(sp.hi());
         format!(
-            "{}:{}:{}: {}:{}",
+            "{}:{}:{}{}",
             lo.file.name.display(filename_display_pref),
             lo.line,
             lo.col.to_usize() + 1,
-            hi.line,
-            hi.col.to_usize() + 1,
+            if let FileNameDisplayPreference::Short = filename_display_pref {
+                String::new()
+            } else {
+                format!(": {}:{}", hi.line, hi.col.to_usize() + 1)
+            }
         )
     }
 
@@ -942,7 +948,7 @@ impl SourceMap {
     /// Otherwise, the span reached to limit is returned.
     pub fn span_look_ahead(&self, span: Span, expect: Option<&str>, limit: Option<usize>) -> Span {
         let mut sp = span;
-        for _ in 0..limit.unwrap_or(100 as usize) {
+        for _ in 0..limit.unwrap_or(100_usize) {
             sp = self.next_point(sp);
             if let Ok(ref snippet) = self.span_to_snippet(sp) {
                 if expect.map_or(false, |es| snippet == es) {
@@ -1151,7 +1157,7 @@ impl FilePathMapping {
             // NOTE: We are iterating over the mapping entries from last to first
             //       because entries specified later on the command line should
             //       take precedence.
-            for &(ref from, ref to) in mapping.iter().rev() {
+            for (from, to) in mapping.iter().rev() {
                 debug!("Trying to apply {from:?} => {to:?}");
 
                 if let Ok(rest) = path.strip_prefix(from) {
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index 1fcf8c7a8bf..ace095736c9 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -9,7 +9,6 @@ use rustc_data_structures::sync::Lock;
 use rustc_macros::HashStable_Generic;
 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
 
-use std::cmp::{Ord, PartialEq, PartialOrd};
 use std::fmt;
 use std::hash::{Hash, Hasher};
 use std::str;
@@ -828,6 +827,7 @@ symbols! {
         item_like_imports,
         iter,
         iter_repeat,
+        iterator_collect_fn,
         kcfi,
         keyword,
         kind,
@@ -1711,7 +1711,8 @@ impl fmt::Display for Ident {
     }
 }
 
-/// This is the most general way to print identifiers.
+/// The most general type to print identifiers.
+///
 /// AST pretty-printer is used as a fallback for turning AST structures into token streams for
 /// proc macros. Additionally, proc macros may stringify their input and expect it survive the
 /// stringification (especially true for proc macro derives written between Rust 1.15 and 1.30).
@@ -1974,7 +1975,6 @@ pub mod kw {
 /// For example `sym::rustfmt` or `sym::u8`.
 pub mod sym {
     use super::Symbol;
-    use std::convert::TryInto;
 
     #[doc(inline)]
     pub use super::sym_generated::*;