make nightly feature

Author: mejrs

compiler/rustc_structures/Cargo.toml

@@ -6,9 +6,19 @@ edition = "2024"
 [dependencies]
 # tidy-alphabetical-start
 bitflags = "2.4.1"
-rustc_data_structures = { path = "../rustc_data_structures" }
-rustc_macros = { path = "../rustc_macros" }
-rustc_serialize = { path = "../rustc_serialize" }
+rustc_data_structures = { path = "../rustc_data_structures", optional = true  }
+rustc_macros = { path = "../rustc_macros", optional = true  }
+rustc_serialize = { path = "../rustc_serialize", optional = true  }
 schemars = "1.0.4"
 serde = "1.0.219"
 # tidy-alphabetical-end
+
+[features]
+# tidy-alphabetical-start
+default = ["nightly"]
+nightly = [
+    "dep:rustc_data_structures",
+    "dep:rustc_macros",
+    "dep:rustc_serialize",
+]
+# tidy-alphabetical-end

compiler/rustc_structures/src/lib.rs

@@ -1,3 +1,5 @@
+#![deny(unstable_features)]
+
 mod limit;
 mod sanitizer_set;
 

compiler/rustc_structures/src/limit.rs

@@ -1,11 +1,13 @@
 use std::fmt;
 use std::ops::{Div, Mul};
 
+#[cfg(feature = "nightly")]
 use rustc_macros::{Decodable_NoContext, Encodable_NoContext, StableHash};
 
 /// New-type wrapper around `usize` for representing limits. Ensures that comparisons against
 /// limits are consistent throughout the compiler.
-#[derive(Clone, Copy, Debug, StableHash, Encodable_NoContext, Decodable_NoContext)]
+#[derive(Clone, Copy, Debug)]
+#[cfg_attr(feature = "nightly", derive(StableHash, Encodable_NoContext, Decodable_NoContext))]
 pub struct Limit(pub usize);
 
 impl Limit {

compiler/rustc_structures/src/sanitizer_set.rs

@@ -1,19 +1,11 @@
 use core::fmt;
 use std::str::FromStr;
 
+#[cfg(feature = "nightly")]
 use rustc_macros::{Decodable_NoContext, Encodable_NoContext, StableHash};
 
-#[derive(
-    Default,
-    Clone,
-    Copy,
-    PartialEq,
-    Eq,
-    Hash,
-    Encodable_NoContext,
-    Decodable_NoContext,
-    StableHash
-)]
+#[derive(Default, Clone, Copy, PartialEq, Eq, Hash)]
+#[cfg_attr(feature = "nightly", derive(Encodable_NoContext, Decodable_NoContext, StableHash))]
 pub struct SanitizerSet(u16);
 bitflags::bitflags! {
     impl SanitizerSet: u16 {
@@ -33,6 +25,8 @@ bitflags::bitflags! {
         const REALTIME = 1 << 13;
     }
 }
+
+#[cfg(feature = "nightly")]
 rustc_data_structures::external_bitflags_debug! { SanitizerSet }
 
 impl SanitizerSet {