Auto merge of rust-lang#93534 - ehuss:rollup-9ecozo9, r=ehuss

Rollup of 9 pull requests

Successful merges:

 - rust-lang#91343 (Fix suggestion to slice if scrutinee is a `Result` or `Option`)
 - rust-lang#93019 (If an integer is entered with an upper-case base prefix (0Xbeef, 0O755, 0B1010), suggest to make it lowercase)
 - rust-lang#93090 (`impl Display for io::ErrorKind`)
 - rust-lang#93456 (Remove an unnecessary transmute from opaque::Encoder)
 - rust-lang#93492 (Hide failed command unless in verbose mode)
 - rust-lang#93504 (kmc-solid: Increase the default stack size)
 - rust-lang#93513 (Allow any pretty printed line to have at least 60 chars)
 - rust-lang#93532 (Update books)
 - rust-lang#93533 (Update cargo)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

Cargo.lock

@@ -337,7 +337,7 @@ dependencies = [
  "cargo-test-macro",
  "cargo-test-support",
  "cargo-util",
- "clap 3.0.10",
+ "clap 3.0.13",
  "crates-io",
  "crossbeam-utils",
  "curl",
@@ -627,9 +627,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "3.0.10"
+version = "3.0.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a30c3bf9ff12dfe5dae53f0a96e0febcd18420d1c0e7fad77796d9d5c4b5375"
+checksum = "08799f92c961c7a1cf0cc398a9073da99e21ce388b46372c37f3191f2f3eed3e"
 dependencies = [
  "atty",
  "bitflags",
@@ -5233,9 +5233,9 @@ dependencies = [
 
 [[package]]
 name = "toml_edit"
-version = "0.13.0"
+version = "0.13.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b80ac5e1b91e3378c63dab121962472b5ca20cf9ab1975e3d588548717807a8"
+checksum = "744e9ed5b352340aa47ce033716991b5589e23781acb97cad37d4ea70560f55b"
 dependencies = [
  "combine",
  "indexmap",

compiler/rustc_ast_pretty/src/pp.rs

@@ -136,6 +136,7 @@ mod ring;
 
 use ring::RingBuffer;
 use std::borrow::Cow;
+use std::cmp;
 use std::collections::VecDeque;
 use std::iter;
 
@@ -199,10 +200,13 @@ enum PrintFrame {
 
 const SIZE_INFINITY: isize = 0xffff;
 
+/// Target line width.
+const MARGIN: isize = 78;
+/// Every line is allowed at least this much space, even if highly indented.
+const MIN_SPACE: isize = 60;
+
 pub struct Printer {
     out: String,
-    /// Width of lines we're constrained to
-    margin: isize,
     /// Number of spaces left on line
     space: isize,
     /// Ring-buffer of tokens and calculated sizes
@@ -237,11 +241,9 @@ struct BufEntry {
 
 impl Printer {
     pub fn new() -> Self {
-        let linewidth = 78;
         Printer {
             out: String::new(),
-            margin: linewidth as isize,
-            space: linewidth as isize,
+            space: MARGIN,
             buf: RingBuffer::new(),
             left_total: 0,
             right_total: 0,
@@ -395,7 +397,7 @@ impl Printer {
             self.print_stack.push(PrintFrame::Broken { indent: self.indent, breaks: token.breaks });
             self.indent = match token.indent {
                 IndentStyle::Block { offset } => (self.indent as isize + offset) as usize,
-                IndentStyle::Visual => (self.margin - self.space) as usize,
+                IndentStyle::Visual => (MARGIN - self.space) as usize,
             };
         } else {
             self.print_stack.push(PrintFrame::Fits);
@@ -421,7 +423,7 @@ impl Printer {
             self.out.push('\n');
             let indent = self.indent as isize + token.offset;
             self.pending_indentation = indent;
-            self.space = self.margin - indent;
+            self.space = cmp::max(MARGIN - indent, MIN_SPACE);
         }
     }
 

compiler/rustc_parse/src/parser/expr.rs

@@ -1700,6 +1700,19 @@ impl<'a> Parser<'a> {
             s.len() > 1 && s.starts_with(first_chars) && s[1..].chars().all(|c| c.is_ascii_digit())
         }
 
+        // Try to lowercase the prefix if it's a valid base prefix.
+        fn fix_base_capitalisation(s: &str) -> Option<String> {
+            if let Some(stripped) = s.strip_prefix("B") {
+                Some(format!("0b{stripped}"))
+            } else if let Some(stripped) = s.strip_prefix("O") {
+                Some(format!("0o{stripped}"))
+            } else if let Some(stripped) = s.strip_prefix("X") {
+                Some(format!("0x{stripped}"))
+            } else {
+                None
+            }
+        }
+
         let token::Lit { kind, suffix, .. } = lit;
         match err {
             // `NotLiteral` is not an error by itself, so we don't report
@@ -1724,6 +1737,18 @@ impl<'a> Parser<'a> {
                     self.struct_span_err(span, &msg)
                         .help("valid widths are 8, 16, 32, 64 and 128")
                         .emit();
+                } else if let Some(fixed) = fix_base_capitalisation(suf) {
+                    let msg = "invalid base prefix for number literal";
+
+                    self.struct_span_err(span, &msg)
+                        .note("base prefixes (`0xff`, `0b1010`, `0o755`) are lowercase")
+                        .span_suggestion(
+                            span,
+                            "try making the prefix lowercase",
+                            fixed,
+                            Applicability::MaybeIncorrect,
+                        )
+                        .emit();
                 } else {
                     let msg = format!("invalid suffix `{}` for number literal", suf);
                     self.struct_span_err(span, &msg)

compiler/rustc_serialize/src/opaque.rs

@@ -130,8 +130,7 @@ impl serialize::Encoder for Encoder {
 
     #[inline]
     fn emit_i8(&mut self, v: i8) -> EncodeResult {
-        let as_u8: u8 = unsafe { std::mem::transmute(v) };
-        self.emit_u8(as_u8)
+        self.emit_u8(v as u8)
     }
 
     #[inline]
@@ -629,9 +628,9 @@ impl<'a> serialize::Decoder for Decoder<'a> {
 
     #[inline]
     fn read_i8(&mut self) -> i8 {
-        let as_u8 = self.data[self.position];
+        let value = self.data[self.position];
         self.position += 1;
-        unsafe { ::std::mem::transmute(as_u8) }
+        value as i8
     }
 
     #[inline]

compiler/rustc_typeck/src/check/pat.rs

@@ -15,7 +15,7 @@ use rustc_session::lint::builtin::NON_EXHAUSTIVE_OMITTED_PATTERNS;
 use rustc_span::hygiene::DesugaringKind;
 use rustc_span::lev_distance::find_best_match_for_name;
 use rustc_span::source_map::{Span, Spanned};
-use rustc_span::symbol::Ident;
+use rustc_span::symbol::{sym, Ident};
 use rustc_span::{BytePos, MultiSpan, DUMMY_SP};
 use rustc_trait_selection::autoderef::Autoderef;
 use rustc_trait_selection::traits::{ObligationCause, Pattern};
@@ -2033,12 +2033,39 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         {
             if let (Some(span), true) = (ti.span, ti.origin_expr) {
                 if let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(span) {
-                    err.span_suggestion(
-                        span,
-                        "consider slicing here",
-                        format!("{}[..]", snippet),
-                        Applicability::MachineApplicable,
-                    );
+                    let applicability = match self.resolve_vars_if_possible(ti.expected).kind() {
+                        ty::Adt(adt_def, _)
+                            if self.tcx.is_diagnostic_item(sym::Option, adt_def.did)
+                                || self.tcx.is_diagnostic_item(sym::Result, adt_def.did) =>
+                        {
+                            // Slicing won't work here, but `.as_deref()` might (issue #91328).
+                            err.span_suggestion(
+                                span,
+                                "consider using `as_deref` here",
+                                format!("{}.as_deref()", snippet),
+                                Applicability::MaybeIncorrect,
+                            );
+                            None
+                        }
+                        // FIXME: instead of checking for Vec only, we could check whether the
+                        // type implements `Deref<Target=X>`; see
+                        // https://github.com/rust-lang/rust/pull/91343#discussion_r761466979
+                        ty::Adt(adt_def, _)
+                            if self.tcx.is_diagnostic_item(sym::Vec, adt_def.did) =>
+                        {
+                            Some(Applicability::MachineApplicable)
+                        }
+                        _ => Some(Applicability::MaybeIncorrect),
+                    };
+
+                    if let Some(applicability) = applicability {
+                        err.span_suggestion(
+                            span,
+                            "consider slicing here",
+                            format!("{}[..]", snippet),
+                            applicability,
+                        );
+                    }
                 }
             }
         }

library/std/src/io/error.rs

@@ -361,13 +361,29 @@ impl ErrorKind {
     }
 }
 
+#[stable(feature = "io_errorkind_display", since = "1.60.0")]
+impl fmt::Display for ErrorKind {
+    /// Shows a human-readable description of the `ErrorKind`.
+    ///
+    /// This is similar to `impl Display for Error`, but doesn't require first converting to Error.
+    ///
+    /// # Examples
+    /// ```
+    /// use std::io::ErrorKind;
+    /// assert_eq!("entity not found", ErrorKind::NotFound.to_string());
+    /// ```
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.write_str(self.as_str())
+    }
+}
+
 /// Intended for use for errors not exposed to the user, where allocating onto
 /// the heap (for normal construction via Error::new) is too costly.
 #[stable(feature = "io_error_from_errorkind", since = "1.14.0")]
 impl From<ErrorKind> for Error {
     /// Converts an [`ErrorKind`] into an [`Error`].
     ///
-    /// This conversion allocates a new error with a simple representation of error kind.
+    /// This conversion creates a new error with a simple representation of error kind.
     ///
     /// # Examples
     ///

library/std/src/sys/itron/thread.rs

@@ -77,7 +77,8 @@ const LIFECYCLE_DETACHED_OR_JOINED: usize = usize::MAX;
 const LIFECYCLE_EXITED_OR_FINISHED_OR_JOIN_FINALIZE: usize = usize::MAX;
 // there's no single value for `JOINING`
 
-pub const DEFAULT_MIN_STACK_SIZE: usize = 1024 * crate::mem::size_of::<usize>();
+// 64KiB for 32-bit ISAs, 128KiB for 64-bit ISAs.
+pub const DEFAULT_MIN_STACK_SIZE: usize = 0x4000 * crate::mem::size_of::<usize>();
 
 impl Thread {
     /// # Safety

src/bootstrap/lib.rs

@@ -851,7 +851,7 @@ impl Build {
             return;
         }
         self.verbose(&format!("running: {:?}", cmd));
-        run(cmd)
+        run(cmd, self.is_verbose())
     }
 
     /// Runs a command, printing out nice contextual information if it fails.
@@ -871,7 +871,7 @@ impl Build {
             return true;
         }
         self.verbose(&format!("running: {:?}", cmd));
-        try_run(cmd)
+        try_run(cmd, self.is_verbose())
     }
 
     /// Runs a command, printing out nice contextual information if it fails.

src/build_helper/lib.rs

@@ -55,18 +55,18 @@ pub fn restore_library_path() {
     }
 }
 
-pub fn run(cmd: &mut Command) {
-    if !try_run(cmd) {
+pub fn run(cmd: &mut Command, print_cmd_on_fail: bool) {
+    if !try_run(cmd, print_cmd_on_fail) {
         std::process::exit(1);
     }
 }
 
-pub fn try_run(cmd: &mut Command) -> bool {
+pub fn try_run(cmd: &mut Command, print_cmd_on_fail: bool) -> bool {
     let status = match cmd.status() {
         Ok(status) => status,
         Err(e) => fail(&format!("failed to execute command: {:?}\nerror: {}", cmd, e)),
     };
-    if !status.success() {
+    if !status.success() && print_cmd_on_fail {
         println!(
             "\n\ncommand did not execute successfully: {:?}\n\
              expected success, got: {}\n\n",