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-rw-r--r--compiler/rustc_hir/src/lang_items.rs30
-rw-r--r--compiler/rustc_span/src/symbol.rs10
-rw-r--r--compiler/rustc_typeck/src/check/method/suggest.rs35
-rw-r--r--library/alloc/src/slice.rs4
-rw-r--r--library/alloc/src/str.rs2
-rw-r--r--library/core/src/array/mod.rs2
-rw-r--r--library/core/src/bool.rs2
-rw-r--r--library/core/src/char/methods.rs2
-rw-r--r--library/core/src/num/f32.rs2
-rw-r--r--library/core/src/num/f64.rs2
-rw-r--r--library/core/src/num/mod.rs32
-rw-r--r--library/core/src/ptr/const_ptr.rs4
-rw-r--r--library/core/src/ptr/mut_ptr.rs4
-rw-r--r--library/core/src/slice/ascii.rs2
-rw-r--r--library/core/src/slice/mod.rs2
-rw-r--r--library/core/src/str/mod.rs2
-rw-r--r--library/std/src/f32.rs2
-rw-r--r--library/std/src/f64.rs2
18 files changed, 51 insertions, 90 deletions
diff --git a/compiler/rustc_hir/src/lang_items.rs b/compiler/rustc_hir/src/lang_items.rs
index 7c312e1b61d..b8df1632144 100644
--- a/compiler/rustc_hir/src/lang_items.rs
+++ b/compiler/rustc_hir/src/lang_items.rs
@@ -166,36 +166,6 @@ pub fn extract(attrs: &[ast::Attribute]) -> Option<(Symbol, Span)> {
 
 language_item_table! {
 //  Variant name,            Name,                     Method name,                Target                  Generic requirements;
-    Bool,                    sym::bool,                bool_impl,                  Target::Impl,           GenericRequirement::None;
-    Char,                    sym::char,                char_impl,                  Target::Impl,           GenericRequirement::None;
-    Str,                     sym::str,                 str_impl,                   Target::Impl,           GenericRequirement::None;
-    Array,                   sym::array,               array_impl,                 Target::Impl,           GenericRequirement::None;
-    Slice,                   sym::slice,               slice_impl,                 Target::Impl,           GenericRequirement::None;
-    SliceU8,                 sym::slice_u8,            slice_u8_impl,              Target::Impl,           GenericRequirement::None;
-    StrAlloc,                sym::str_alloc,           str_alloc_impl,             Target::Impl,           GenericRequirement::None;
-    SliceAlloc,              sym::slice_alloc,         slice_alloc_impl,           Target::Impl,           GenericRequirement::None;
-    SliceU8Alloc,            sym::slice_u8_alloc,      slice_u8_alloc_impl,        Target::Impl,           GenericRequirement::None;
-    ConstPtr,                sym::const_ptr,           const_ptr_impl,             Target::Impl,           GenericRequirement::None;
-    MutPtr,                  sym::mut_ptr,             mut_ptr_impl,               Target::Impl,           GenericRequirement::None;
-    ConstSlicePtr,           sym::const_slice_ptr,     const_slice_ptr_impl,       Target::Impl,           GenericRequirement::None;
-    MutSlicePtr,             sym::mut_slice_ptr,       mut_slice_ptr_impl,         Target::Impl,           GenericRequirement::None;
-    I8,                      sym::i8,                  i8_impl,                    Target::Impl,           GenericRequirement::None;
-    I16,                     sym::i16,                 i16_impl,                   Target::Impl,           GenericRequirement::None;
-    I32,                     sym::i32,                 i32_impl,                   Target::Impl,           GenericRequirement::None;
-    I64,                     sym::i64,                 i64_impl,                   Target::Impl,           GenericRequirement::None;
-    I128,                    sym::i128,                i128_impl,                  Target::Impl,           GenericRequirement::None;
-    Isize,                   sym::isize,               isize_impl,                 Target::Impl,           GenericRequirement::None;
-    U8,                      sym::u8,                  u8_impl,                    Target::Impl,           GenericRequirement::None;
-    U16,                     sym::u16,                 u16_impl,                   Target::Impl,           GenericRequirement::None;
-    U32,                     sym::u32,                 u32_impl,                   Target::Impl,           GenericRequirement::None;
-    U64,                     sym::u64,                 u64_impl,                   Target::Impl,           GenericRequirement::None;
-    U128,                    sym::u128,                u128_impl,                  Target::Impl,           GenericRequirement::None;
-    Usize,                   sym::usize,               usize_impl,                 Target::Impl,           GenericRequirement::None;
-    F32,                     sym::f32,                 f32_impl,                   Target::Impl,           GenericRequirement::None;
-    F64,                     sym::f64,                 f64_impl,                   Target::Impl,           GenericRequirement::None;
-    F32Runtime,              sym::f32_runtime,         f32_runtime_impl,           Target::Impl,           GenericRequirement::None;
-    F64Runtime,              sym::f64_runtime,         f64_runtime_impl,           Target::Impl,           GenericRequirement::None;
-
     Sized,                   sym::sized,               sized_trait,                Target::Trait,          GenericRequirement::Exact(0);
     Unsize,                  sym::unsize,              unsize_trait,               Target::Trait,          GenericRequirement::Minimum(1);
     /// Trait injected by `#[derive(PartialEq)]`, (i.e. "Partial EQ").
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index 6dd9b8e44dd..84dbad846dd 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -494,11 +494,9 @@ symbols! {
         const_panic,
         const_panic_fmt,
         const_precise_live_drops,
-        const_ptr,
         const_raw_ptr_deref,
         const_raw_ptr_to_usize_cast,
         const_refs_to_cell,
-        const_slice_ptr,
         const_trait_bound_opt_out,
         const_trait_impl,
         const_transmute,
@@ -655,9 +653,7 @@ symbols! {
         f,
         f16c_target_feature,
         f32,
-        f32_runtime,
         f64,
-        f64_runtime,
         fabsf32,
         fabsf64,
         fadd_fast,
@@ -913,8 +909,6 @@ symbols! {
         mul_with_overflow,
         must_not_suspend,
         must_use,
-        mut_ptr,
-        mut_slice_ptr,
         naked,
         naked_functions,
         name,
@@ -1314,11 +1308,8 @@ symbols! {
         sized,
         skip,
         slice,
-        slice_alloc,
         slice_len_fn,
         slice_patterns,
-        slice_u8,
-        slice_u8_alloc,
         slicing_syntax,
         soft,
         specialization,
@@ -1348,7 +1339,6 @@ symbols! {
         stop_after_dataflow,
         store,
         str,
-        str_alloc,
         str_split_whitespace,
         str_trim,
         str_trim_end,
diff --git a/compiler/rustc_typeck/src/check/method/suggest.rs b/compiler/rustc_typeck/src/check/method/suggest.rs
index 9c3f2da5644..cc4707b6b72 100644
--- a/compiler/rustc_typeck/src/check/method/suggest.rs
+++ b/compiler/rustc_typeck/src/check/method/suggest.rs
@@ -281,25 +281,26 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     // There are methods that are defined on the primitive types and won't be
                     // found when exploring `all_traits`, but we also need them to be acurate on
                     // our suggestions (#47759).
-                    let fund_assoc = |opt_def_id: Option<DefId>| {
-                        opt_def_id.and_then(|id| self.associated_value(id, item_name)).is_some()
+                    let found_assoc = |ty: Ty<'tcx>| {
+                        simplify_type(tcx, ty, TreatParams::AsPlaceholders).and_then(|simp| {
+                            tcx.incoherent_impls(simp)
+                            .iter()
+                            .find_map(|&id| self.associated_value(id, item_name))
+                        }).is_some()
                     };
-                    let lang_items = tcx.lang_items();
                     let found_candidate = candidates.next().is_some()
-                        || fund_assoc(lang_items.i8_impl())
-                        || fund_assoc(lang_items.i16_impl())
-                        || fund_assoc(lang_items.i32_impl())
-                        || fund_assoc(lang_items.i64_impl())
-                        || fund_assoc(lang_items.i128_impl())
-                        || fund_assoc(lang_items.u8_impl())
-                        || fund_assoc(lang_items.u16_impl())
-                        || fund_assoc(lang_items.u32_impl())
-                        || fund_assoc(lang_items.u64_impl())
-                        || fund_assoc(lang_items.u128_impl())
-                        || fund_assoc(lang_items.f32_impl())
-                        || fund_assoc(lang_items.f32_runtime_impl())
-                        || fund_assoc(lang_items.f64_impl())
-                        || fund_assoc(lang_items.f64_runtime_impl());
+                        || found_assoc(tcx.types.i8)
+                        || found_assoc(tcx.types.i16)
+                        || found_assoc(tcx.types.i32)
+                        || found_assoc(tcx.types.i64)
+                        || found_assoc(tcx.types.i128)
+                        || found_assoc(tcx.types.u8)
+                        || found_assoc(tcx.types.u16)
+                        || found_assoc(tcx.types.u32)
+                        || found_assoc(tcx.types.u64)
+                        || found_assoc(tcx.types.u128)
+                        || found_assoc(tcx.types.f32)
+                        || found_assoc(tcx.types.f32);
                     if let (true, false, SelfSource::MethodCall(expr), true) = (
                         actual.is_numeric(),
                         actual.has_concrete_skeleton(),
diff --git a/library/alloc/src/slice.rs b/library/alloc/src/slice.rs
index 111c57e884b..c61e9d85dd1 100644
--- a/library/alloc/src/slice.rs
+++ b/library/alloc/src/slice.rs
@@ -237,7 +237,7 @@ mod hack {
     }
 }
 
-#[lang = "slice_alloc"]
+#[cfg_attr(bootstrap, lang = "slice_alloc")]
 #[cfg(not(test))]
 impl<T> [T] {
     /// Sorts the slice.
@@ -667,7 +667,7 @@ impl<T> [T] {
     }
 }
 
-#[lang = "slice_u8_alloc"]
+#[cfg_attr(bootstrap, lang = "slice_u8_alloc")]
 #[cfg(not(test))]
 impl [u8] {
     /// Returns a vector containing a copy of this slice where each byte
diff --git a/library/alloc/src/str.rs b/library/alloc/src/str.rs
index bf70363258c..a3c17612c3a 100644
--- a/library/alloc/src/str.rs
+++ b/library/alloc/src/str.rs
@@ -235,7 +235,7 @@ impl ToOwned for str {
 }
 
 /// Methods for string slices.
-#[lang = "str_alloc"]
+#[cfg_attr(bootstrap, lang = "str_alloc")]
 #[cfg(not(test))]
 impl str {
     /// Converts a `Box<str>` into a `Box<[u8]>` without copying or allocating.
diff --git a/library/core/src/array/mod.rs b/library/core/src/array/mod.rs
index 20dfbc6347c..9e42ab5923a 100644
--- a/library/core/src/array/mod.rs
+++ b/library/core/src/array/mod.rs
@@ -395,7 +395,7 @@ macro_rules! array_impl_default {
 
 array_impl_default! {32, T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T}
 
-#[lang = "array"]
+#[cfg_attr(bootstrap, lang = "array")]
 impl<T, const N: usize> [T; N] {
     /// Returns an array of the same size as `self`, with function `f` applied to each element
     /// in order.
diff --git a/library/core/src/bool.rs b/library/core/src/bool.rs
index a13593a539d..06aee3ccbaf 100644
--- a/library/core/src/bool.rs
+++ b/library/core/src/bool.rs
@@ -2,7 +2,7 @@
 
 use crate::marker::Destruct;
 
-#[lang = "bool"]
+#[cfg_attr(bootstrap, lang = "bool")]
 impl bool {
     /// Returns `Some(t)` if the `bool` is [`true`](../std/keyword.true.html),
     /// or `None` otherwise.
diff --git a/library/core/src/char/methods.rs b/library/core/src/char/methods.rs
index f75cd74ee2d..7deb3358c95 100644
--- a/library/core/src/char/methods.rs
+++ b/library/core/src/char/methods.rs
@@ -7,7 +7,7 @@ use crate::unicode::{self, conversions};
 
 use super::*;
 
-#[lang = "char"]
+#[cfg_attr(bootstrap, lang = "char")]
 impl char {
     /// The highest valid code point a `char` can have, `'\u{10FFFF}'`.
     ///
diff --git a/library/core/src/num/f32.rs b/library/core/src/num/f32.rs
index d8dcfdafa8d..17ca8547685 100644
--- a/library/core/src/num/f32.rs
+++ b/library/core/src/num/f32.rs
@@ -370,7 +370,7 @@ pub mod consts {
     pub const LN_10: f32 = 2.30258509299404568401799145468436421_f32;
 }
 
-#[lang = "f32"]
+#[cfg_attr(bootstrap, lang = "f32")]
 #[cfg(not(test))]
 impl f32 {
     /// The radix or base of the internal representation of `f32`.
diff --git a/library/core/src/num/f64.rs b/library/core/src/num/f64.rs
index 7c2f51ff646..350d8529de5 100644
--- a/library/core/src/num/f64.rs
+++ b/library/core/src/num/f64.rs
@@ -370,7 +370,7 @@ pub mod consts {
     pub const LN_10: f64 = 2.30258509299404568401799145468436421_f64;
 }
 
-#[lang = "f64"]
+#[cfg_attr(bootstrap, lang = "f64")]
 #[cfg(not(test))]
 impl f64 {
     /// The radix or base of the internal representation of `f64`.
diff --git a/library/core/src/num/mod.rs b/library/core/src/num/mod.rs
index c09f642d969..f4f1d274d10 100644
--- a/library/core/src/num/mod.rs
+++ b/library/core/src/num/mod.rs
@@ -193,26 +193,26 @@ macro_rules! widening_impl {
     };
 }
 
-#[lang = "i8"]
+#[cfg_attr(bootstrap, lang = "i8")]
 impl i8 {
     int_impl! { i8, i8, u8, 8, 7, -128, 127, 2, "-0x7e", "0xa", "0x12", "0x12", "0x48",
     "[0x12]", "[0x12]", "", "" }
 }
 
-#[lang = "i16"]
+#[cfg_attr(bootstrap, lang = "i16")]
 impl i16 {
     int_impl! { i16, i16, u16, 16, 15, -32768, 32767, 4, "-0x5ffd", "0x3a", "0x1234", "0x3412",
     "0x2c48", "[0x34, 0x12]", "[0x12, 0x34]", "", "" }
 }
 
-#[lang = "i32"]
+#[cfg_attr(bootstrap, lang = "i32")]
 impl i32 {
     int_impl! { i32, i32, u32, 32, 31, -2147483648, 2147483647, 8, "0x10000b3", "0xb301",
     "0x12345678", "0x78563412", "0x1e6a2c48", "[0x78, 0x56, 0x34, 0x12]",
     "[0x12, 0x34, 0x56, 0x78]", "", "" }
 }
 
-#[lang = "i64"]
+#[cfg_attr(bootstrap, lang = "i64")]
 impl i64 {
     int_impl! { i64, i64, u64, 64, 63, -9223372036854775808, 9223372036854775807, 12,
     "0xaa00000000006e1", "0x6e10aa", "0x1234567890123456", "0x5634129078563412",
@@ -220,7 +220,7 @@ impl i64 {
     "[0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56]", "", "" }
 }
 
-#[lang = "i128"]
+#[cfg_attr(bootstrap, lang = "i128")]
 impl i128 {
     int_impl! { i128, i128, u128, 128, 127, -170141183460469231731687303715884105728,
     170141183460469231731687303715884105727, 16,
@@ -233,7 +233,7 @@ impl i128 {
 }
 
 #[cfg(target_pointer_width = "16")]
-#[lang = "isize"]
+#[cfg_attr(bootstrap, lang = "isize")]
 impl isize {
     int_impl! { isize, i16, usize, 16, 15, -32768, 32767, 4, "-0x5ffd", "0x3a", "0x1234",
     "0x3412", "0x2c48", "[0x34, 0x12]", "[0x12, 0x34]",
@@ -241,7 +241,7 @@ impl isize {
 }
 
 #[cfg(target_pointer_width = "32")]
-#[lang = "isize"]
+#[cfg_attr(bootstrap, lang = "isize")]
 impl isize {
     int_impl! { isize, i32, usize, 32, 31, -2147483648, 2147483647, 8, "0x10000b3", "0xb301",
     "0x12345678", "0x78563412", "0x1e6a2c48", "[0x78, 0x56, 0x34, 0x12]",
@@ -250,7 +250,7 @@ impl isize {
 }
 
 #[cfg(target_pointer_width = "64")]
-#[lang = "isize"]
+#[cfg_attr(bootstrap, lang = "isize")]
 impl isize {
     int_impl! { isize, i64, usize, 64, 63, -9223372036854775808, 9223372036854775807,
     12, "0xaa00000000006e1", "0x6e10aa",  "0x1234567890123456", "0x5634129078563412",
@@ -262,7 +262,7 @@ impl isize {
 /// If 6th bit set ascii is upper case.
 const ASCII_CASE_MASK: u8 = 0b0010_0000;
 
-#[lang = "u8"]
+#[cfg_attr(bootstrap, lang = "u8")]
 impl u8 {
     uint_impl! { u8, u8, i8, NonZeroU8, 8, 255, 2, "0x82", "0xa", "0x12", "0x12", "0x48", "[0x12]",
     "[0x12]", "", "" }
@@ -816,7 +816,7 @@ impl u8 {
     }
 }
 
-#[lang = "u16"]
+#[cfg_attr(bootstrap, lang = "u16")]
 impl u16 {
     uint_impl! { u16, u16, i16, NonZeroU16, 16, 65535, 4, "0xa003", "0x3a", "0x1234", "0x3412", "0x2c48",
     "[0x34, 0x12]", "[0x12, 0x34]", "", "" }
@@ -848,14 +848,14 @@ impl u16 {
     }
 }
 
-#[lang = "u32"]
+#[cfg_attr(bootstrap, lang = "u32")]
 impl u32 {
     uint_impl! { u32, u32, i32, NonZeroU32, 32, 4294967295, 8, "0x10000b3", "0xb301", "0x12345678",
     "0x78563412", "0x1e6a2c48", "[0x78, 0x56, 0x34, 0x12]", "[0x12, 0x34, 0x56, 0x78]", "", "" }
     widening_impl! { u32, u64, 32, unsigned }
 }
 
-#[lang = "u64"]
+#[cfg_attr(bootstrap, lang = "u64")]
 impl u64 {
     uint_impl! { u64, u64, i64, NonZeroU64, 64, 18446744073709551615, 12, "0xaa00000000006e1", "0x6e10aa",
     "0x1234567890123456", "0x5634129078563412", "0x6a2c48091e6a2c48",
@@ -865,7 +865,7 @@ impl u64 {
     widening_impl! { u64, u128, 64, unsigned }
 }
 
-#[lang = "u128"]
+#[cfg_attr(bootstrap, lang = "u128")]
 impl u128 {
     uint_impl! { u128, u128, i128, NonZeroU128, 128, 340282366920938463463374607431768211455, 16,
     "0x13f40000000000000000000000004f76", "0x4f7613f4", "0x12345678901234567890123456789012",
@@ -878,7 +878,7 @@ impl u128 {
 }
 
 #[cfg(target_pointer_width = "16")]
-#[lang = "usize"]
+#[cfg_attr(bootstrap, lang = "usize")]
 impl usize {
     uint_impl! { usize, u16, isize, NonZeroUsize, 16, 65535, 4, "0xa003", "0x3a", "0x1234", "0x3412", "0x2c48",
     "[0x34, 0x12]", "[0x12, 0x34]",
@@ -886,7 +886,7 @@ impl usize {
     widening_impl! { usize, u32, 16, unsigned }
 }
 #[cfg(target_pointer_width = "32")]
-#[lang = "usize"]
+#[cfg_attr(bootstrap, lang = "usize")]
 impl usize {
     uint_impl! { usize, u32, isize, NonZeroUsize, 32, 4294967295, 8, "0x10000b3", "0xb301", "0x12345678",
     "0x78563412", "0x1e6a2c48", "[0x78, 0x56, 0x34, 0x12]", "[0x12, 0x34, 0x56, 0x78]",
@@ -895,7 +895,7 @@ impl usize {
 }
 
 #[cfg(target_pointer_width = "64")]
-#[lang = "usize"]
+#[cfg_attr(bootstrap, lang = "usize")]
 impl usize {
     uint_impl! { usize, u64, isize, NonZeroUsize, 64, 18446744073709551615, 12, "0xaa00000000006e1", "0x6e10aa",
     "0x1234567890123456", "0x5634129078563412", "0x6a2c48091e6a2c48",
diff --git a/library/core/src/ptr/const_ptr.rs b/library/core/src/ptr/const_ptr.rs
index 74c64370ddc..ab2e6058d2f 100644
--- a/library/core/src/ptr/const_ptr.rs
+++ b/library/core/src/ptr/const_ptr.rs
@@ -4,7 +4,7 @@ use crate::intrinsics;
 use crate::mem;
 use crate::slice::{self, SliceIndex};
 
-#[lang = "const_ptr"]
+#[cfg_attr(bootstrap, lang = "const_ptr")]
 impl<T: ?Sized> *const T {
     /// Returns `true` if the pointer is null.
     ///
@@ -969,7 +969,7 @@ impl<T: ?Sized> *const T {
     }
 }
 
-#[lang = "const_slice_ptr"]
+#[cfg_attr(bootstrap, lang = "const_slice_ptr")]
 impl<T> *const [T] {
     /// Returns the length of a raw slice.
     ///
diff --git a/library/core/src/ptr/mut_ptr.rs b/library/core/src/ptr/mut_ptr.rs
index 7e48eac4fe0..6a71815c3cf 100644
--- a/library/core/src/ptr/mut_ptr.rs
+++ b/library/core/src/ptr/mut_ptr.rs
@@ -3,7 +3,7 @@ use crate::cmp::Ordering::{self, Equal, Greater, Less};
 use crate::intrinsics;
 use crate::slice::{self, SliceIndex};
 
-#[lang = "mut_ptr"]
+#[cfg_attr(bootstrap, lang = "mut_ptr")]
 impl<T: ?Sized> *mut T {
     /// Returns `true` if the pointer is null.
     ///
@@ -1240,7 +1240,7 @@ impl<T: ?Sized> *mut T {
     }
 }
 
-#[lang = "mut_slice_ptr"]
+#[cfg_attr(bootstrap, lang = "mut_slice_ptr")]
 impl<T> *mut [T] {
     /// Returns the length of a raw slice.
     ///
diff --git a/library/core/src/slice/ascii.rs b/library/core/src/slice/ascii.rs
index c02a6f2d78c..1825ccda479 100644
--- a/library/core/src/slice/ascii.rs
+++ b/library/core/src/slice/ascii.rs
@@ -6,7 +6,7 @@ use crate::iter;
 use crate::mem;
 use crate::ops;
 
-#[lang = "slice_u8"]
+#[cfg_attr(bootstrap, lang = "slice_u8")]
 #[cfg(not(test))]
 impl [u8] {
     /// Checks if all bytes in this slice are within the ASCII range.
diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
index 26d4fa15d0a..77bf5f9dc34 100644
--- a/library/core/src/slice/mod.rs
+++ b/library/core/src/slice/mod.rs
@@ -109,7 +109,7 @@ enum Direction {
     Back,
 }
 
-#[lang = "slice"]
+#[cfg_attr(bootstrap, lang = "slice")]
 #[cfg(not(test))]
 impl<T> [T] {
     /// Returns the number of elements in the slice.
diff --git a/library/core/src/str/mod.rs b/library/core/src/str/mod.rs
index c603420f0f8..6bfa6a5e015 100644
--- a/library/core/src/str/mod.rs
+++ b/library/core/src/str/mod.rs
@@ -130,7 +130,7 @@ fn slice_error_fail_rt(s: &str, begin: usize, end: usize) -> ! {
     );
 }
 
-#[lang = "str"]
+#[cfg_attr(bootstrap, lang = "str")]
 #[cfg(not(test))]
 impl str {
     /// Returns the length of `self`.
diff --git a/library/std/src/f32.rs b/library/std/src/f32.rs
index 1faf57e13db..70b5941c7c7 100644
--- a/library/std/src/f32.rs
+++ b/library/std/src/f32.rs
@@ -28,7 +28,7 @@ pub use core::f32::{
 };
 
 #[cfg(not(test))]
-#[lang = "f32_runtime"]
+#[cfg_attr(bootstrap, lang = "f32_runtime")]
 impl f32 {
     /// Returns the largest integer less than or equal to a number.
     ///
diff --git a/library/std/src/f64.rs b/library/std/src/f64.rs
index 22d58ab84cf..b90d068ec10 100644
--- a/library/std/src/f64.rs
+++ b/library/std/src/f64.rs
@@ -28,7 +28,7 @@ pub use core::f64::{
 };
 
 #[cfg(not(test))]
-#[lang = "f64_runtime"]
+#[cfg_attr(bootstrap, lang = "f64_runtime")]
 impl f64 {
     /// Returns the largest integer less than or equal to a number.
     ///
generated by cgit-pink 1.4.1-3-g733a5 (git 2.37.1) at 2026-04-25 02:32:08 +0000