Auto merge of rust-lang#91104 - matthiaskrgr:rollup-duk33o1, r=matthiaskrgr

Rollup of 4 pull requests

Successful merges:

 - rust-lang#91008 (Adds IEEE 754-2019 minimun and maximum functions for f32/f64)
 - rust-lang#91070 (Make `LLVMRustGetOrInsertGlobal` always return a `GlobalVariable`)
 - rust-lang#91097 (Add spaces in opaque `impl Trait` with more than one trait)
 - rust-lang#91098 (Don't suggest certain fixups (`.field`, `.await`, etc) when reporting errors while matching on arrays )

Failed merges:

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

Author: bors

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -1695,11 +1695,23 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
             }
             _ => exp_found,
         };
-        debug!("exp_found {:?} terr {:?}", exp_found, terr);
+        debug!("exp_found {:?} terr {:?} cause.code {:?}", exp_found, terr, cause.code);
         if let Some(exp_found) = exp_found {
-            self.suggest_as_ref_where_appropriate(span, &exp_found, diag);
-            self.suggest_accessing_field_where_appropriate(cause, &exp_found, diag);
-            self.suggest_await_on_expect_found(cause, span, &exp_found, diag);
+            let should_suggest_fixes = if let ObligationCauseCode::Pattern { root_ty, .. } =
+                &cause.code
+            {
+                // Skip if the root_ty of the pattern is not the same as the expected_ty.
+                // If these types aren't equal then we've probably peeled off a layer of arrays.
+                same_type_modulo_infer(self.resolve_vars_if_possible(*root_ty), exp_found.expected)
+            } else {
+                true
+            };
+
+            if should_suggest_fixes {
+                self.suggest_as_ref_where_appropriate(span, &exp_found, diag);
+                self.suggest_accessing_field_where_appropriate(cause, &exp_found, diag);
+                self.suggest_await_on_expect_found(cause, span, &exp_found, diag);
+            }
         }
 
         // In some (most?) cases cause.body_id points to actual body, but in some cases
@@ -1879,7 +1891,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                 .iter()
                 .filter(|field| field.vis.is_accessible_from(field.did, self.tcx))
                 .map(|field| (field.ident.name, field.ty(self.tcx, expected_substs)))
-                .find(|(_, ty)| ty::TyS::same_type(ty, exp_found.found))
+                .find(|(_, ty)| same_type_modulo_infer(ty, exp_found.found))
             {
                 if let ObligationCauseCode::Pattern { span: Some(span), .. } = cause.code {
                     if let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(span) {
@@ -1944,7 +1956,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                                         | (_, ty::Infer(_))
                                         | (ty::Param(_), _)
                                         | (ty::Infer(_), _) => {}
-                                        _ if ty::TyS::same_type(exp_ty, found_ty) => {}
+                                        _ if same_type_modulo_infer(exp_ty, found_ty) => {}
                                         _ => show_suggestion = false,
                                     };
                                 }

compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp

@@ -124,8 +124,18 @@ extern "C" LLVMValueRef LLVMRustGetOrInsertFunction(LLVMModuleRef M,
 
 extern "C" LLVMValueRef
 LLVMRustGetOrInsertGlobal(LLVMModuleRef M, const char *Name, size_t NameLen, LLVMTypeRef Ty) {
+  Module *Mod = unwrap(M);
   StringRef NameRef(Name, NameLen);
-  return wrap(unwrap(M)->getOrInsertGlobal(NameRef, unwrap(Ty)));
+
+  // We don't use Module::getOrInsertGlobal because that returns a Constant*,
+  // which may either be the real GlobalVariable*, or a constant bitcast of it
+  // if our type doesn't match the original declaration. We always want the
+  // GlobalVariable* so we can access linkage, visibility, etc.
+  GlobalVariable *GV = Mod->getGlobalVariable(NameRef, true);
+  if (!GV)
+    GV = new GlobalVariable(*Mod, unwrap(Ty), false,
+                            GlobalValue::ExternalLinkage, nullptr, NameRef);
+  return wrap(GV);
 }
 
 extern "C" LLVMValueRef

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -688,7 +688,7 @@ pub trait PrettyPrinter<'tcx>:
                                 }
 
                                 p!(
-                                    write("{}", if first { " " } else { "+" }),
+                                    write("{}", if first { " " } else { " + " }),
                                     print(trait_ref.print_only_trait_path())
                                 );
 
@@ -699,7 +699,7 @@ pub trait PrettyPrinter<'tcx>:
                     }
 
                     if is_future {
-                        p!(write("{}Future", if first { " " } else { "+" }));
+                        p!(write("{}Future", if first { " " } else { " + " }));
                         first = false;
 
                         if let Some(future_output_ty) = future_output_ty {
@@ -712,7 +712,7 @@ pub trait PrettyPrinter<'tcx>:
                     }
 
                     if !is_sized {
-                        p!(write("{}?Sized", if first { " " } else { "+" }));
+                        p!(write("{}?Sized", if first { " " } else { " + " }));
                     } else if first {
                         p!(" Sized");
                     }

library/core/src/num/f32.rs

@@ -673,6 +673,9 @@ impl f32 {
 
     /// Returns the maximum of the two numbers.
     ///
+    /// Follows the IEEE-754 2008 semantics for maxNum, except for handling of signaling NaNs.
+    /// This matches the behavior of libm’s fmin.
+    ///
     /// ```
     /// let x = 1.0f32;
     /// let y = 2.0f32;
@@ -689,6 +692,9 @@ impl f32 {
 
     /// Returns the minimum of the two numbers.
     ///
+    /// Follows the IEEE-754 2008 semantics for minNum, except for handling of signaling NaNs.
+    /// This matches the behavior of libm’s fmin.
+    ///
     /// ```
     /// let x = 1.0f32;
     /// let y = 2.0f32;
@@ -703,6 +709,68 @@ impl f32 {
         intrinsics::minnumf32(self, other)
     }
 
+    /// Returns the maximum of the two numbers, propagating NaNs.
+    ///
+    /// This returns NaN when *either* argument is NaN, as opposed to
+    /// [`f32::max`] which only returns NaN when *both* arguments are NaN.
+    ///
+    /// ```
+    /// #![feature(float_minimum_maximum)]
+    /// let x = 1.0f32;
+    /// let y = 2.0f32;
+    ///
+    /// assert_eq!(x.maximum(y), y);
+    /// assert!(x.maximum(f32::NAN).is_nan());
+    /// ```
+    ///
+    /// If one of the arguments is NaN, then NaN is returned. Otherwise this returns the greater
+    /// of the two numbers. For this operation, -0.0 is considered to be less than +0.0.
+    /// Note that this follows the semantics specified in IEEE 754-2019.
+    #[unstable(feature = "float_minimum_maximum", issue = "91079")]
+    #[inline]
+    pub fn maximum(self, other: f32) -> f32 {
+        if self > other {
+            self
+        } else if other > self {
+            other
+        } else if self == other {
+            if self.is_sign_positive() && other.is_sign_negative() { self } else { other }
+        } else {
+            self + other
+        }
+    }
+
+    /// Returns the minimum of the two numbers, propagating NaNs.
+    ///
+    /// This returns NaN when *either* argument is NaN, as opposed to
+    /// [`f32::min`] which only returns NaN when *both* arguments are NaN.
+    ///
+    /// ```
+    /// #![feature(float_minimum_maximum)]
+    /// let x = 1.0f32;
+    /// let y = 2.0f32;
+    ///
+    /// assert_eq!(x.minimum(y), x);
+    /// assert!(x.minimum(f32::NAN).is_nan());
+    /// ```
+    ///
+    /// If one of the arguments is NaN, then NaN is returned. Otherwise this returns the lesser
+    /// of the two numbers. For this operation, -0.0 is considered to be less than +0.0.
+    /// Note that this follows the semantics specified in IEEE 754-2019.
+    #[unstable(feature = "float_minimum_maximum", issue = "91079")]
+    #[inline]
+    pub fn minimum(self, other: f32) -> f32 {
+        if self < other {
+            self
+        } else if other < self {
+            other
+        } else if self == other {
+            if self.is_sign_negative() && other.is_sign_positive() { self } else { other }
+        } else {
+            self + other
+        }
+    }
+
     /// Rounds toward zero and converts to any primitive integer type,
     /// assuming that the value is finite and fits in that type.
     ///

library/core/src/num/f64.rs

@@ -689,6 +689,9 @@ impl f64 {
 
     /// Returns the maximum of the two numbers.
     ///
+    /// Follows the IEEE-754 2008 semantics for maxNum, except for handling of signaling NaNs.
+    /// This matches the behavior of libm’s fmin.
+    ///
     /// ```
     /// let x = 1.0_f64;
     /// let y = 2.0_f64;
@@ -705,6 +708,9 @@ impl f64 {
 
     /// Returns the minimum of the two numbers.
     ///
+    /// Follows the IEEE-754 2008 semantics for minNum, except for handling of signaling NaNs.
+    /// This matches the behavior of libm’s fmin.
+    ///
     /// ```
     /// let x = 1.0_f64;
     /// let y = 2.0_f64;
@@ -719,6 +725,68 @@ impl f64 {
         intrinsics::minnumf64(self, other)
     }
 
+    /// Returns the maximum of the two numbers, propagating NaNs.
+    ///
+    /// This returns NaN when *either* argument is NaN, as opposed to
+    /// [`f64::max`] which only returns NaN when *both* arguments are NaN.
+    ///
+    /// ```
+    /// #![feature(float_minimum_maximum)]
+    /// let x = 1.0_f64;
+    /// let y = 2.0_f64;
+    ///
+    /// assert_eq!(x.maximum(y), y);
+    /// assert!(x.maximum(f64::NAN).is_nan());
+    /// ```
+    ///
+    /// If one of the arguments is NaN, then NaN is returned. Otherwise this returns the greater
+    /// of the two numbers. For this operation, -0.0 is considered to be less than +0.0.
+    /// Note that this follows the semantics specified in IEEE 754-2019.
+    #[unstable(feature = "float_minimum_maximum", issue = "91079")]
+    #[inline]
+    pub fn maximum(self, other: f64) -> f64 {
+        if self > other {
+            self
+        } else if other > self {
+            other
+        } else if self == other {
+            if self.is_sign_positive() && other.is_sign_negative() { self } else { other }
+        } else {
+            self + other
+        }
+    }
+
+    /// Returns the minimum of the two numbers, propagating NaNs.
+    ///
+    /// This returns NaN when *either* argument is NaN, as opposed to
+    /// [`f64::min`] which only returns NaN when *both* arguments are NaN.
+    ///
+    /// ```
+    /// #![feature(float_minimum_maximum)]
+    /// let x = 1.0_f64;
+    /// let y = 2.0_f64;
+    ///
+    /// assert_eq!(x.minimum(y), x);
+    /// assert!(x.minimum(f64::NAN).is_nan());
+    /// ```
+    ///
+    /// If one of the arguments is NaN, then NaN is returned. Otherwise this returns the lesser
+    /// of the two numbers. For this operation, -0.0 is considered to be less than +0.0.
+    /// Note that this follows the semantics specified in IEEE 754-2019.
+    #[unstable(feature = "float_minimum_maximum", issue = "91079")]
+    #[inline]
+    pub fn minimum(self, other: f64) -> f64 {
+        if self < other {
+            self
+        } else if other < self {
+            other
+        } else if self == other {
+            if self.is_sign_negative() && other.is_sign_positive() { self } else { other }
+        } else {
+            self + other
+        }
+    }
+
     /// Rounds toward zero and converts to any primitive integer type,
     /// assuming that the value is finite and fits in that type.
     ///

library/core/tests/lib.rs

@@ -27,6 +27,7 @@
 #![feature(extern_types)]
 #![feature(flt2dec)]
 #![feature(fmt_internals)]
+#![feature(float_minimum_maximum)]
 #![feature(array_from_fn)]
 #![feature(hashmap_internals)]
 #![feature(try_find)]

library/core/tests/num/mod.rs

@@ -715,6 +715,67 @@ macro_rules! test_float {
                 assert!(($nan as $fty).max($nan).is_nan());
             }
             #[test]
+            fn minimum() {
+                assert_eq!((0.0 as $fty).minimum(0.0), 0.0);
+                assert!((0.0 as $fty).minimum(0.0).is_sign_positive());
+                assert_eq!((-0.0 as $fty).minimum(0.0), -0.0);
+                assert!((-0.0 as $fty).minimum(0.0).is_sign_negative());
+                assert_eq!((-0.0 as $fty).minimum(-0.0), -0.0);
+                assert!((-0.0 as $fty).minimum(-0.0).is_sign_negative());
+                assert_eq!((9.0 as $fty).minimum(9.0), 9.0);
+                assert_eq!((-9.0 as $fty).minimum(0.0), -9.0);
+                assert_eq!((0.0 as $fty).minimum(9.0), 0.0);
+                assert!((0.0 as $fty).minimum(9.0).is_sign_positive());
+                assert_eq!((-0.0 as $fty).minimum(9.0), -0.0);
+                assert!((-0.0 as $fty).minimum(9.0).is_sign_negative());
+                assert_eq!((-0.0 as $fty).minimum(-9.0), -9.0);
+                assert_eq!(($inf as $fty).minimum(9.0), 9.0);
+                assert_eq!((9.0 as $fty).minimum($inf), 9.0);
+                assert_eq!(($inf as $fty).minimum(-9.0), -9.0);
+                assert_eq!((-9.0 as $fty).minimum($inf), -9.0);
+                assert_eq!(($neginf as $fty).minimum(9.0), $neginf);
+                assert_eq!((9.0 as $fty).minimum($neginf), $neginf);
+                assert_eq!(($neginf as $fty).minimum(-9.0), $neginf);
+                assert_eq!((-9.0 as $fty).minimum($neginf), $neginf);
+                assert!(($nan as $fty).minimum(9.0).is_nan());
+                assert!(($nan as $fty).minimum(-9.0).is_nan());
+                assert!((9.0 as $fty).minimum($nan).is_nan());
+                assert!((-9.0 as $fty).minimum($nan).is_nan());
+                assert!(($nan as $fty).minimum($nan).is_nan());
+            }
+            #[test]
+            fn maximum() {
+                assert_eq!((0.0 as $fty).maximum(0.0), 0.0);
+                assert!((0.0 as $fty).maximum(0.0).is_sign_positive());
+                assert_eq!((-0.0 as $fty).maximum(0.0), 0.0);
+                assert!((-0.0 as $fty).maximum(0.0).is_sign_positive());
+                assert_eq!((-0.0 as $fty).maximum(-0.0), -0.0);
+                assert!((-0.0 as $fty).maximum(-0.0).is_sign_negative());
+                assert_eq!((9.0 as $fty).maximum(9.0), 9.0);
+                assert_eq!((-9.0 as $fty).maximum(0.0), 0.0);
+                assert!((-9.0 as $fty).maximum(0.0).is_sign_positive());
+                assert_eq!((-9.0 as $fty).maximum(-0.0), -0.0);
+                assert!((-9.0 as $fty).maximum(-0.0).is_sign_negative());
+                assert_eq!((0.0 as $fty).maximum(9.0), 9.0);
+                assert_eq!((0.0 as $fty).maximum(-9.0), 0.0);
+                assert!((0.0 as $fty).maximum(-9.0).is_sign_positive());
+                assert_eq!((-0.0 as $fty).maximum(-9.0), -0.0);
+                assert!((-0.0 as $fty).maximum(-9.0).is_sign_negative());
+                assert_eq!(($inf as $fty).maximum(9.0), $inf);
+                assert_eq!((9.0 as $fty).maximum($inf), $inf);
+                assert_eq!(($inf as $fty).maximum(-9.0), $inf);
+                assert_eq!((-9.0 as $fty).maximum($inf), $inf);
+                assert_eq!(($neginf as $fty).maximum(9.0), 9.0);
+                assert_eq!((9.0 as $fty).maximum($neginf), 9.0);
+                assert_eq!(($neginf as $fty).maximum(-9.0), -9.0);
+                assert_eq!((-9.0 as $fty).maximum($neginf), -9.0);
+                assert!(($nan as $fty).maximum(9.0).is_nan());
+                assert!(($nan as $fty).maximum(-9.0).is_nan());
+                assert!((9.0 as $fty).maximum($nan).is_nan());
+                assert!((-9.0 as $fty).maximum($nan).is_nan());
+                assert!(($nan as $fty).maximum($nan).is_nan());
+            }
+            #[test]
             fn rem_euclid() {
                 let a: $fty = 42.0;
                 assert!($inf.rem_euclid(a).is_nan());

library/std/src/f32/tests.rs

@@ -19,6 +19,18 @@ fn test_max_nan() {
     assert_eq!(2.0f32.max(f32::NAN), 2.0);
 }
 
+#[test]
+fn test_minimum() {
+    assert!(f32::NAN.minimum(2.0).is_nan());
+    assert!(2.0f32.minimum(f32::NAN).is_nan());
+}
+
+#[test]
+fn test_maximum() {
+    assert!(f32::NAN.maximum(2.0).is_nan());
+    assert!(2.0f32.maximum(f32::NAN).is_nan());
+}
+
 #[test]
 fn test_nan() {
     let nan: f32 = f32::NAN;

library/std/src/lib.rs

@@ -287,6 +287,7 @@
 #![feature(exhaustive_patterns)]
 #![feature(extend_one)]
 #![feature(fn_traits)]
+#![feature(float_minimum_maximum)]
 #![feature(format_args_nl)]
 #![feature(gen_future)]
 #![feature(generator_trait)]

src/test/ui/associated-types/issue-87261.rs

@@ -83,17 +83,17 @@ fn main() {
     //~^ ERROR type mismatch resolving `<impl DerivedTrait as Trait>::Associated == ()`
 
     accepts_trait(returns_opaque_foo());
-    //~^ ERROR type mismatch resolving `<impl Trait+Foo as Trait>::Associated == ()`
+    //~^ ERROR type mismatch resolving `<impl Trait + Foo as Trait>::Associated == ()`
 
     accepts_trait(returns_opaque_derived_foo());
-    //~^ ERROR type mismatch resolving `<impl DerivedTrait+Foo as Trait>::Associated == ()`
+    //~^ ERROR type mismatch resolving `<impl DerivedTrait + Foo as Trait>::Associated == ()`
 
     accepts_generic_trait(returns_opaque_generic());
     //~^ ERROR type mismatch resolving `<impl GenericTrait<()> as GenericTrait<()>>::Associated == ()`
 
     accepts_generic_trait(returns_opaque_generic_foo());
-    //~^ ERROR type mismatch resolving `<impl GenericTrait<()>+Foo as GenericTrait<()>>::Associated == ()`
+    //~^ ERROR type mismatch resolving `<impl GenericTrait<()> + Foo as GenericTrait<()>>::Associated == ()`
 
     accepts_generic_trait(returns_opaque_generic_duplicate());
-    //~^ ERROR type mismatch resolving `<impl GenericTrait<()>+GenericTrait<u8> as GenericTrait<()>>::Associated == ()`
+    //~^ ERROR type mismatch resolving `<impl GenericTrait<()> + GenericTrait<u8> as GenericTrait<()>>::Associated == ()`
 }