Deny float const params even when adt_const_params is enabled

compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs

@@ -226,7 +226,7 @@ impl Qualif for CustomEq {
         // because that component may be part of an enum variant (e.g.,
         // `Option::<NonStructuralMatchTy>::Some`), in which case some values of this type may be
         // structural-match (`Option::None`).
-        traits::search_for_structural_match_violation(cx.body.span, cx.tcx, ty).is_some()
+        traits::search_for_structural_match_violation(cx.body.span, cx.tcx, ty, true).is_some()
     }
 
     fn in_adt_inherently<'tcx>(

compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs

@@ -120,32 +120,37 @@ impl<'a, 'tcx> ConstToPat<'a, 'tcx> {
     }
 
     fn search_for_structural_match_violation(&self, ty: Ty<'tcx>) -> Option<String> {
-        traits::search_for_structural_match_violation(self.span, self.tcx(), ty).map(|non_sm_ty| {
-            with_no_trimmed_paths!(match non_sm_ty.kind {
-                traits::NonStructuralMatchTyKind::Adt(adt) => self.adt_derive_msg(adt),
-                traits::NonStructuralMatchTyKind::Dynamic => {
-                    "trait objects cannot be used in patterns".to_string()
-                }
-                traits::NonStructuralMatchTyKind::Opaque => {
-                    "opaque types cannot be used in patterns".to_string()
-                }
-                traits::NonStructuralMatchTyKind::Closure => {
-                    "closures cannot be used in patterns".to_string()
-                }
-                traits::NonStructuralMatchTyKind::Generator => {
-                    "generators cannot be used in patterns".to_string()
-                }
-                traits::NonStructuralMatchTyKind::Param => {
-                    bug!("use of a constant whose type is a parameter inside a pattern")
-                }
-                traits::NonStructuralMatchTyKind::Projection => {
-                    bug!("use of a constant whose type is a projection inside a pattern")
-                }
-                traits::NonStructuralMatchTyKind::Foreign => {
-                    bug!("use of a value of a foreign type inside a pattern")
-                }
-            })
-        })
+        traits::search_for_structural_match_violation(self.span, self.tcx(), ty, true).map(
+            |non_sm_ty| {
+                with_no_trimmed_paths!(match non_sm_ty.kind {
+                    traits::NonStructuralMatchTyKind::Adt(adt) => self.adt_derive_msg(adt),
+                    traits::NonStructuralMatchTyKind::Dynamic => {
+                        "trait objects cannot be used in patterns".to_string()
+                    }
+                    traits::NonStructuralMatchTyKind::Opaque => {
+                        "opaque types cannot be used in patterns".to_string()
+                    }
+                    traits::NonStructuralMatchTyKind::Closure => {
+                        "closures cannot be used in patterns".to_string()
+                    }
+                    traits::NonStructuralMatchTyKind::Generator => {
+                        "generators cannot be used in patterns".to_string()
+                    }
+                    traits::NonStructuralMatchTyKind::Float => {
+                        "floating-point numbers cannot be used in patterns".to_string()
+                    }
+                    traits::NonStructuralMatchTyKind::Param => {
+                        bug!("use of a constant whose type is a parameter inside a pattern")
+                    }
+                    traits::NonStructuralMatchTyKind::Projection => {
+                        bug!("use of a constant whose type is a projection inside a pattern")
+                    }
+                    traits::NonStructuralMatchTyKind::Foreign => {
+                        bug!("use of a value of a foreign type inside a pattern")
+                    }
+                })
+            },
+        )
     }
 
     fn type_marked_structural(&self, ty: Ty<'tcx>) -> bool {

compiler/rustc_trait_selection/src/traits/structural_match.rs

@@ -26,6 +26,7 @@ pub enum NonStructuralMatchTyKind<'tcx> {
     Closure,
     Generator,
     Projection,
+    Float,
 }
 
 /// This method traverses the structure of `ty`, trying to find an
@@ -53,12 +54,16 @@ pub enum NonStructuralMatchTyKind<'tcx> {
 /// For more background on why Rust has this requirement, and issues
 /// that arose when the requirement was not enforced completely, see
 /// Rust RFC 1445, rust-lang/rust#61188, and rust-lang/rust#62307.
+///
+/// The floats_allowed flag is used to deny constants in floating point
 pub fn search_for_structural_match_violation<'tcx>(
     span: Span,
     tcx: TyCtxt<'tcx>,
     ty: Ty<'tcx>,
+    floats_allowed: bool,
 ) -> Option<NonStructuralMatchTy<'tcx>> {
-    ty.visit_with(&mut Search { tcx, span, seen: FxHashSet::default() }).break_value()
+    ty.visit_with(&mut Search { tcx, span, seen: FxHashSet::default(), floats_allowed })
+        .break_value()
 }
 
 /// This method returns true if and only if `adt_ty` itself has been marked as
@@ -119,6 +124,8 @@ struct Search<'tcx> {
     /// Tracks ADTs previously encountered during search, so that
     /// we will not recur on them again.
     seen: FxHashSet<hir::def_id::DefId>,
+
+    floats_allowed: bool,
 }
 
 impl<'tcx> Search<'tcx> {
@@ -192,13 +199,24 @@ impl<'tcx> TypeVisitor<'tcx> for Search<'tcx> {
                 // for empty array.
                 return ControlFlow::CONTINUE;
             }
-            ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) | ty::Str | ty::Never => {
+            ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Str | ty::Never => {
                 // These primitive types are always structural match.
                 //
                 // `Never` is kind of special here, but as it is not inhabitable, this should be fine.
                 return ControlFlow::CONTINUE;
             }
 
+            ty::Float(_) => {
+                if self.floats_allowed {
+                    return ControlFlow::CONTINUE;
+                } else {
+                    return ControlFlow::Break(NonStructuralMatchTy {
+                        ty,
+                        kind: NonStructuralMatchTyKind::Float,
+                    });
+                }
+            }
+
             ty::Array(..) | ty::Slice(_) | ty::Ref(..) | ty::Tuple(..) => {
                 // First check all contained types and then tell the caller to continue searching.
                 return ty.super_visit_with(self);

compiler/rustc_typeck/src/check/wfcheck.rs

@@ -824,50 +824,62 @@ fn check_param_wf(tcx: TyCtxt<'_>, param: &hir::GenericParam<'_>) {
                 }
 
                 if let Some(non_structural_match_ty) =
-                    traits::search_for_structural_match_violation(param.span, tcx, ty)
+                    traits::search_for_structural_match_violation(param.span, tcx, ty, false)
                 {
                     // We use the same error code in both branches, because this is really the same
                     // issue: we just special-case the message for type parameters to make it
                     // clearer.
-                    if let ty::Param(_) = ty.peel_refs().kind() {
-                        // Const parameters may not have type parameters as their types,
-                        // because we cannot be sure that the type parameter derives `PartialEq`
-                        // and `Eq` (just implementing them is not enough for `structural_match`).
-                        struct_span_err!(
-                            tcx.sess,
-                            hir_ty.span,
-                            E0741,
-                            "`{}` is not guaranteed to `#[derive(PartialEq, Eq)]`, so may not be \
-                            used as the type of a const parameter",
-                            ty,
-                        )
-                        .span_label(
-                            hir_ty.span,
-                            format!("`{}` may not derive both `PartialEq` and `Eq`", ty),
-                        )
-                        .note(
-                            "it is not currently possible to use a type parameter as the type of a \
-                            const parameter",
-                        )
-                        .emit();
-                    } else {
-                        let mut diag = struct_span_err!(
-                            tcx.sess,
-                            hir_ty.span,
-                            E0741,
-                            "`{}` must be annotated with `#[derive(PartialEq, Eq)]` to be used as \
-                            the type of a const parameter",
-                            non_structural_match_ty.ty,
-                        );
-
-                        if ty == non_structural_match_ty.ty {
-                            diag.span_label(
+                    match ty.peel_refs().kind() {
+                        ty::Param(_) => {
+                            // Const parameters may not have type parameters as their types,
+                            // because we cannot be sure that the type parameter derives `PartialEq`
+                            // and `Eq` (just implementing them is not enough for `structural_match`).
+                            struct_span_err!(
+                                tcx.sess,
                                 hir_ty.span,
-                                format!("`{ty}` doesn't derive both `PartialEq` and `Eq`"),
-                            );
+                                E0741,
+                                "`{ty}` is not guaranteed to `#[derive(PartialEq, Eq)]`, so may not be \
+                                used as the type of a const parameter",
+                            )
+                            .span_label(
+                                hir_ty.span,
+                                format!("`{ty}` may not derive both `PartialEq` and `Eq`"),
+                            )
+                            .note(
+                                "it is not currently possible to use a type parameter as the type of a \
+                                const parameter",
+                            )
+                            .emit();
+                        }
+                        ty::Float(_) => {
+                            struct_span_err!(
+                                tcx.sess,
+                                hir_ty.span,
+                                E0741,
+                                "`{ty}` is forbidden as the type of a const generic parameter",
+                            )
+                            .note("floats do not derive `Eq` or `Ord`, which are required for const parameters")
+                            .emit();
                         }
+                        _ => {
+                            let mut diag = struct_span_err!(
+                                tcx.sess,
+                                hir_ty.span,
+                                E0741,
+                                "`{}` must be annotated with `#[derive(PartialEq, Eq)]` to be used as \
+                                the type of a const parameter",
+                                non_structural_match_ty.ty,
+                            );
 
-                        diag.emit();
+                            if ty == non_structural_match_ty.ty {
+                                diag.span_label(
+                                    hir_ty.span,
+                                    format!("`{ty}` doesn't derive both `PartialEq` and `Eq`"),
+                                );
+                            }
+
+                            diag.emit();
+                        }
                     }
                 }
             } else {

src/test/ui/const-generics/float-generic.adt_const_params.stderr

@@ -0,0 +1,11 @@
+error[E0741]: `f32` is forbidden as the type of a const generic parameter
+  --> $DIR/float-generic.rs:5:17
+   |
+LL | fn foo<const F: f32>() {}
+   |                 ^^^
+   |
+   = note: floats do not derive `Eq` or `Ord`, which are required for const parameters
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0741`.

src/test/ui/const-generics/float-generic.rs

@@ -0,0 +1,12 @@
+// revisions: simple adt_const_params
+#![cfg_attr(adt_const_params, feature(adt_const_params))]
+#![cfg_attr(adt_const_params, allow(incomplete_features))]
+
+fn foo<const F: f32>() {}
+//~^ ERROR `f32` is forbidden as the type of a const generic parameter
+
+const C: f32 = 1.0;
+
+fn main() {
+    foo::<C>();
+}

src/test/ui/const-generics/float-generic.simple.stderr

@@ -0,0 +1,11 @@
+error: `f32` is forbidden as the type of a const generic parameter
+  --> $DIR/float-generic.rs:5:17
+   |
+LL | fn foo<const F: f32>() {}
+   |                 ^^^
+   |
+   = note: the only supported types are integers, `bool` and `char`
+   = help: more complex types are supported with `#![feature(adt_const_params)]`
+
+error: aborting due to previous error
+