Auto merge of #68526 - JohnTitor:rollup-3mmljof, r=JohnTitor

Rollup of 6 pull requests

Successful merges:

 - #68111 (Print constants in `type_name` for const generics)
 - #68374 (Fix invalid link to the C++ Exception Handling ABI documentation)
 - #68504 (Use check-pass mode for lint tests and nll tests)
 - #68509 (Clean up error codes E0223 and E0225 explanations)
 - #68511 (Remove unused ignore-license directives)
 - #68515 (Support feature process_set_argv0 for VxWorks)

Failed merges:

r? @ghost

Author: bors

src/libpanic_unwind/gcc.rs

@@ -4,7 +4,7 @@
 //! "Exception Handling in LLVM" (llvm.org/docs/ExceptionHandling.html) and
 //! documents linked from it.
 //! These are also good reads:
-//!     http://mentorembedded.github.io/cxx-abi/abi-eh.html
+//!     https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html
 //!     http://monoinfinito.wordpress.com/series/exception-handling-in-c/
 //!     http://www.airs.com/blog/index.php?s=exception+frames
 //!

src/librustc/ty/print/pretty.rs

@@ -831,14 +831,27 @@ pub trait PrettyPrinter<'tcx>:
         Ok(self)
     }
 
-    fn pretty_print_const(mut self, ct: &'tcx ty::Const<'tcx>) -> Result<Self::Const, Self::Error> {
+    fn pretty_print_const(
+        mut self,
+        ct: &'tcx ty::Const<'tcx>,
+        print_ty: bool,
+    ) -> Result<Self::Const, Self::Error> {
         define_scoped_cx!(self);
 
         if self.tcx().sess.verbose() {
             p!(write("Const({:?}: {:?})", ct.val, ct.ty));
             return Ok(self);
         }
 
+        macro_rules! print_underscore {
+            () => {{
+                p!(write("_"));
+                if print_ty {
+                    p!(write(": "), print(ct.ty));
+                }
+            }};
+        }
+
         match (ct.val, &ct.ty.kind) {
             (_, ty::FnDef(did, substs)) => p!(print_value_path(*did, substs)),
             (ty::ConstKind::Unevaluated(did, substs, promoted), _) => {
@@ -857,22 +870,27 @@ pub trait PrettyPrinter<'tcx>:
                                 {
                                     p!(write("{}", snip))
                                 } else {
-                                    p!(write("_: "), print(ct.ty))
+                                    print_underscore!()
                                 }
                             } else {
-                                p!(write("_: "), print(ct.ty))
+                                print_underscore!()
                             }
                         }
                     }
                 }
             }
-            (ty::ConstKind::Infer(..), _) => p!(write("_: "), print(ct.ty)),
+            (ty::ConstKind::Infer(..), _) => print_underscore!(),
             (ty::ConstKind::Param(ParamConst { name, .. }), _) => p!(write("{}", name)),
-            (ty::ConstKind::Value(value), _) => return self.pretty_print_const_value(value, ct.ty),
+            (ty::ConstKind::Value(value), _) => {
+                return self.pretty_print_const_value(value, ct.ty, print_ty);
+            }
 
             _ => {
                 // fallback
-                p!(write("{:?} : ", ct.val), print(ct.ty))
+                p!(write("{:?}", ct.val));
+                if print_ty {
+                    p!(write(" : "), print(ct.ty));
+                }
             }
         };
         Ok(self)
@@ -882,6 +900,7 @@ pub trait PrettyPrinter<'tcx>:
         mut self,
         ct: ConstValue<'tcx>,
         ty: Ty<'tcx>,
+        print_ty: bool,
     ) -> Result<Self::Const, Self::Error> {
         define_scoped_cx!(self);
 
@@ -988,7 +1007,10 @@ pub trait PrettyPrinter<'tcx>:
                 };
                 if !printed {
                     // fallback
-                    p!(write("{:?} : ", ct), print(ty))
+                    p!(write("{:?}", ct));
+                    if print_ty {
+                        p!(write(" : "), print(ty));
+                    }
                 }
             }
         };
@@ -1162,7 +1184,7 @@ impl<F: fmt::Write> Printer<'tcx> for FmtPrinter<'_, 'tcx, F> {
     }
 
     fn print_const(self, ct: &'tcx ty::Const<'tcx>) -> Result<Self::Const, Self::Error> {
-        self.pretty_print_const(ct)
+        self.pretty_print_const(ct, true)
     }
 
     fn path_crate(mut self, cnum: CrateNum) -> Result<Self::Path, Self::Error> {

src/librustc_codegen_utils/symbol_names/legacy.rs

@@ -237,7 +237,7 @@ impl Printer<'tcx> for SymbolPrinter<'tcx> {
         // only print integers
         if let ty::ConstKind::Value(ConstValue::Scalar(Scalar::Raw { .. })) = ct.val {
             if ct.ty.is_integral() {
-                return self.pretty_print_const(ct);
+                return self.pretty_print_const(ct, true);
             }
         }
         self.write_str("_")?;

src/librustc_error_codes/error_codes/E0223.md

@@ -1,5 +1,6 @@
 An attempt was made to retrieve an associated type, but the type was ambiguous.
-For example:
+
+Erroneous code example:
 
 ```compile_fail,E0223
 trait MyTrait {type X; }

src/librustc_error_codes/error_codes/E0225.md

@@ -1,12 +1,15 @@
-You attempted to use multiple types as bounds for a closure or trait object.
-Rust does not currently support this. A simple example that causes this error:
+Multiple types were used as bounds for a closure or trait object.
+
+Erroneous code example:
 
 ```compile_fail,E0225
 fn main() {
     let _: Box<dyn std::io::Read + std::io::Write>;
 }
 ```
 
+Rust does not currently support this.
+
 Auto traits such as Send and Sync are an exception to this rule:
 It's possible to have bounds of one non-builtin trait, plus any number of
 auto traits. For example, the following compiles correctly:

src/librustc_mir/interpret/intrinsics/type_name.rs

@@ -69,9 +69,8 @@ impl<'tcx> Printer<'tcx> for AbsolutePathPrinter<'tcx> {
         }
     }
 
-    fn print_const(self, _: &'tcx ty::Const<'tcx>) -> Result<Self::Const, Self::Error> {
-        // don't print constants to the user
-        Ok(self)
+    fn print_const(self, ct: &'tcx ty::Const<'tcx>) -> Result<Self::Const, Self::Error> {
+        self.pretty_print_const(ct, false)
     }
 
     fn print_dyn_existential(

src/libstd/sys/cloudabi/abi/bitflags.rs

@@ -21,9 +21,6 @@
 // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 // SUCH DAMAGE.
 
-// Appease Rust's tidy.
-// ignore-license
-
 #[cfg(feature = "bitflags")]
 use bitflags::bitflags;
 

src/libstd/sys/cloudabi/abi/cloudabi.rs

@@ -26,7 +26,6 @@
 // Source: https://github.com/NuxiNL/cloudabi
 
 // Appease Rust's tidy.
-// ignore-license
 // ignore-tidy-linelength
 
 //! **PLEASE NOTE: This entire crate including this

src/libstd/sys/vxworks/ext/process.rs

@@ -2,6 +2,7 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
+use crate::ffi::OsStr;
 use crate::io;
 use crate::process;
 use crate::sys;
@@ -105,6 +106,15 @@ pub trait CommandExt {
     /// cross-platform `spawn` instead.
     #[stable(feature = "process_exec2", since = "1.9.0")]
     fn exec(&mut self) -> io::Error;
+
+    /// Set executable argument
+    ///
+    /// Set the first process argument, `argv[0]`, to something other than the
+    /// default executable path.
+    #[unstable(feature = "process_set_argv0", issue = "66510")]
+    fn arg0<S>(&mut self, arg: S) -> &mut process::Command
+    where
+        S: AsRef<OsStr>;
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -130,6 +140,14 @@ impl CommandExt for process::Command {
     fn exec(&mut self) -> io::Error {
         self.as_inner_mut().exec(sys::process::Stdio::Inherit)
     }
+
+    fn arg0<S>(&mut self, arg: S) -> &mut process::Command
+    where
+        S: AsRef<OsStr>,
+    {
+        self.as_inner_mut().set_arg_0(arg.as_ref());
+        self
+    }
 }
 
 /// Unix-specific extensions to [`process::ExitStatus`].

src/libstd/sys/vxworks/process/process_common.rs

@@ -90,8 +90,8 @@ impl Command {
         let program = os2c(program, &mut saw_nul);
         Command {
             argv: Argv(vec![program.as_ptr(), ptr::null()]),
+            args: vec![program.clone()],
             program,
-            args: Vec::new(),
             env: Default::default(),
             cwd: None,
             uid: None,
@@ -104,11 +104,19 @@ impl Command {
         }
     }
 
+    pub fn set_arg_0(&mut self, arg: &OsStr) {
+        // Set a new arg0
+        let arg = os2c(arg, &mut self.saw_nul);
+        debug_assert!(self.argv.0.len() > 1);
+        self.argv.0[0] = arg.as_ptr();
+        self.args[0] = arg;
+    }
+
     pub fn arg(&mut self, arg: &OsStr) {
         // Overwrite the trailing NULL pointer in `argv` and then add a new null
         // pointer.
         let arg = os2c(arg, &mut self.saw_nul);
-        self.argv.0[self.args.len() + 1] = arg.as_ptr();
+        self.argv.0[self.args.len()] = arg.as_ptr();
         self.argv.0.push(ptr::null());
 
         // Also make sure we keep track of the owned value to schedule a
@@ -133,6 +141,10 @@ impl Command {
         &self.argv.0
     }
 
+    pub fn get_program(&self) -> &CStr {
+        &*self.program
+    }
+
     #[allow(dead_code)]
     pub fn get_cwd(&self) -> &Option<CString> {
         &self.cwd
@@ -315,8 +327,12 @@ impl ChildStdio {
 
 impl fmt::Debug for Command {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{:?}", self.program)?;
-        for arg in &self.args {
+        if self.program != self.args[0] {
+            write!(f, "[{:?}] ", self.program)?;
+        }
+        write!(f, "{:?}", self.args[0])?;
+
+        for arg in &self.args[1..] {
             write!(f, " {:?}", arg)?;
         }
         Ok(())