Rollup of 8 pull requests

.github/workflows/ci.yml

@@ -291,7 +291,7 @@ jobs:
           - name: x86_64-gnu-integration
             env:
               CI_ONLY_WHEN_CHANNEL: nightly
-            os: ubuntu-20.04-16core-64gb
+            os: ubuntu-20.04-8core-32gb
           - name: x86_64-gnu-debug
             os: ubuntu-20.04-8core-32gb
             env: {}

Cargo.lock

@@ -4342,7 +4342,6 @@ dependencies = [
 name = "rustc_pattern_analysis"
 version = "0.0.0"
 dependencies = [
- "derivative",
  "rustc-hash",
  "rustc_apfloat",
  "rustc_arena",

compiler/rustc_middle/src/query/mod.rs

@@ -109,7 +109,7 @@ pub use plumbing::{IntoQueryParam, TyCtxtAt, TyCtxtEnsure, TyCtxtEnsureWithValue
 // as they will raise an fatal error on query cycles instead.
 rustc_queries! {
     /// This exists purely for testing the interactions between span_delayed_bug and incremental.
-    query trigger_span_delayed_bug(key: DefId) -> () {
+    query trigger_span_delayed_bug(key: DefId) {
         desc { "triggering a span delayed bug for testing incremental" }
     }
 
@@ -119,7 +119,7 @@ rustc_queries! {
         desc { "compute registered tools for crate" }
     }
 
-    query early_lint_checks(_: ()) -> () {
+    query early_lint_checks(_: ()) {
         desc { "perform lints prior to macro expansion" }
     }
 
@@ -299,7 +299,7 @@ rustc_queries! {
     /// name. This is useful for cases were not all linting code from rustc
     /// was called. With the default `None` all registered lints will also
     /// be checked for expectation fulfillment.
-    query check_expectations(key: Option<Symbol>) -> () {
+    query check_expectations(key: Option<Symbol>) {
         eval_always
         desc { "checking lint expectations (RFC 2383)" }
     }
@@ -906,39 +906,39 @@ rustc_queries! {
     }
 
     /// Performs lint checking for the module.
-    query lint_mod(key: LocalModDefId) -> () {
+    query lint_mod(key: LocalModDefId) {
         desc { |tcx| "linting {}", describe_as_module(key, tcx) }
     }
 
-    query check_unused_traits(_: ()) -> () {
+    query check_unused_traits(_: ()) {
         desc { "checking unused trait imports in crate" }
     }
 
     /// Checks the attributes in the module.
-    query check_mod_attrs(key: LocalModDefId) -> () {
+    query check_mod_attrs(key: LocalModDefId) {
         desc { |tcx| "checking attributes in {}", describe_as_module(key, tcx) }
     }
 
     /// Checks for uses of unstable APIs in the module.
-    query check_mod_unstable_api_usage(key: LocalModDefId) -> () {
+    query check_mod_unstable_api_usage(key: LocalModDefId) {
         desc { |tcx| "checking for unstable API usage in {}", describe_as_module(key, tcx) }
     }
 
     /// Checks the const bodies in the module for illegal operations (e.g. `if` or `loop`).
-    query check_mod_const_bodies(key: LocalModDefId) -> () {
+    query check_mod_const_bodies(key: LocalModDefId) {
         desc { |tcx| "checking consts in {}", describe_as_module(key, tcx) }
     }
 
     /// Checks the loops in the module.
-    query check_mod_loops(key: LocalModDefId) -> () {
+    query check_mod_loops(key: LocalModDefId) {
         desc { |tcx| "checking loops in {}", describe_as_module(key, tcx) }
     }
 
-    query check_mod_naked_functions(key: LocalModDefId) -> () {
+    query check_mod_naked_functions(key: LocalModDefId) {
         desc { |tcx| "checking naked functions in {}", describe_as_module(key, tcx) }
     }
 
-    query check_mod_privacy(key: LocalModDefId) -> () {
+    query check_mod_privacy(key: LocalModDefId) {
         desc { |tcx| "checking privacy in {}", describe_as_module(key.to_local_def_id(), tcx) }
     }
 
@@ -958,7 +958,7 @@ rustc_queries! {
         desc { "finding live symbols in crate" }
     }
 
-    query check_mod_deathness(key: LocalModDefId) -> () {
+    query check_mod_deathness(key: LocalModDefId) {
         desc { |tcx| "checking deathness of variables in {}", describe_as_module(key, tcx) }
     }
 
@@ -972,7 +972,7 @@ rustc_queries! {
         ensure_forwards_result_if_red
     }
 
-    query collect_mod_item_types(key: LocalModDefId) -> () {
+    query collect_mod_item_types(key: LocalModDefId) {
         desc { |tcx| "collecting item types in {}", describe_as_module(key, tcx) }
     }
 
@@ -1121,7 +1121,7 @@ rustc_queries! {
         eval_always
         desc { "checking effective visibilities" }
     }
-    query check_private_in_public(_: ()) -> () {
+    query check_private_in_public(_: ()) {
         eval_always
         desc { "checking for private elements in public interfaces" }
     }

compiler/rustc_pattern_analysis/Cargo.toml

@@ -5,7 +5,6 @@ edition = "2021"
 
 [dependencies]
 # tidy-alphabetical-start
-derivative = "2.2.0"
 rustc-hash = "1.1.0"
 rustc_apfloat = "0.2.0"
 rustc_arena = { path = "../rustc_arena", optional = true }

compiler/rustc_pattern_analysis/src/constructor.rs

@@ -151,6 +151,7 @@
 use std::cmp::{self, max, min, Ordering};
 use std::fmt;
 use std::iter::once;
+use std::mem;
 
 use smallvec::SmallVec;
 
@@ -648,8 +649,6 @@ impl OpaqueId {
 /// `specialize_constructor` returns the list of fields corresponding to a pattern, given a
 /// constructor. `Constructor::apply` reconstructs the pattern from a pair of `Constructor` and
 /// `Fields`.
-#[derive(derivative::Derivative)]
-#[derivative(Debug(bound = ""), Clone(bound = ""), PartialEq(bound = ""))]
 pub enum Constructor<Cx: TypeCx> {
     /// Tuples and structs.
     Struct,
@@ -692,6 +691,101 @@ pub enum Constructor<Cx: TypeCx> {
     Missing,
 }
 
+impl<Cx: TypeCx> Clone for Constructor<Cx> {
+    fn clone(&self) -> Self {
+        match self {
+            Constructor::Struct => Constructor::Struct,
+            Constructor::Variant(idx) => Constructor::Variant(idx.clone()),
+            Constructor::Ref => Constructor::Ref,
+            Constructor::Slice(slice) => Constructor::Slice(slice.clone()),
+            Constructor::UnionField => Constructor::UnionField,
+            Constructor::Bool(b) => Constructor::Bool(b.clone()),
+            Constructor::IntRange(range) => Constructor::IntRange(range.clone()),
+            Constructor::F32Range(lo, hi, end) => {
+                Constructor::F32Range(lo.clone(), hi.clone(), end.clone())
+            }
+            Constructor::F64Range(lo, hi, end) => {
+                Constructor::F64Range(lo.clone(), hi.clone(), end.clone())
+            }
+            Constructor::Str(value) => Constructor::Str(value.clone()),
+            Constructor::Opaque(inner) => Constructor::Opaque(inner.clone()),
+            Constructor::Or => Constructor::Or,
+            Constructor::Wildcard => Constructor::Wildcard,
+            Constructor::NonExhaustive => Constructor::NonExhaustive,
+            Constructor::Hidden => Constructor::Hidden,
+            Constructor::Missing => Constructor::Missing,
+        }
+    }
+}
+
+impl<Cx: TypeCx> fmt::Debug for Constructor<Cx> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Constructor::Struct => f.debug_tuple("Struct").finish(),
+            Constructor::Variant(idx) => f.debug_tuple("Variant").field(idx).finish(),
+            Constructor::Ref => f.debug_tuple("Ref").finish(),
+            Constructor::Slice(slice) => f.debug_tuple("Slice").field(slice).finish(),
+            Constructor::UnionField => f.debug_tuple("UnionField").finish(),
+            Constructor::Bool(b) => f.debug_tuple("Bool").field(b).finish(),
+            Constructor::IntRange(range) => f.debug_tuple("IntRange").field(range).finish(),
+            Constructor::F32Range(lo, hi, end) => {
+                f.debug_tuple("F32Range").field(lo).field(hi).field(end).finish()
+            }
+            Constructor::F64Range(lo, hi, end) => {
+                f.debug_tuple("F64Range").field(lo).field(hi).field(end).finish()
+            }
+            Constructor::Str(value) => f.debug_tuple("Str").field(value).finish(),
+            Constructor::Opaque(inner) => f.debug_tuple("Opaque").field(inner).finish(),
+            Constructor::Or => f.debug_tuple("Or").finish(),
+            Constructor::Wildcard => f.debug_tuple("Wildcard").finish(),
+            Constructor::NonExhaustive => f.debug_tuple("NonExhaustive").finish(),
+            Constructor::Hidden => f.debug_tuple("Hidden").finish(),
+            Constructor::Missing => f.debug_tuple("Missing").finish(),
+        }
+    }
+}
+
+impl<Cx: TypeCx> PartialEq for Constructor<Cx> {
+    fn eq(&self, other: &Self) -> bool {
+        (mem::discriminant(self) == mem::discriminant(other))
+            && match (self, other) {
+                (Constructor::Struct, Constructor::Struct) => true,
+                (Constructor::Variant(self_variant), Constructor::Variant(other_variant)) => {
+                    self_variant == other_variant
+                }
+                (Constructor::Ref, Constructor::Ref) => true,
+                (Constructor::Slice(self_slice), Constructor::Slice(other_slice)) => {
+                    self_slice == other_slice
+                }
+                (Constructor::UnionField, Constructor::UnionField) => true,
+                (Constructor::Bool(self_b), Constructor::Bool(other_b)) => self_b == other_b,
+                (Constructor::IntRange(self_range), Constructor::IntRange(other_range)) => {
+                    self_range == other_range
+                }
+                (
+                    Constructor::F32Range(self_lo, self_hi, self_end),
+                    Constructor::F32Range(other_lo, other_hi, other_end),
+                ) => self_lo == other_lo && self_hi == other_hi && self_end == other_end,
+                (
+                    Constructor::F64Range(self_lo, self_hi, self_end),
+                    Constructor::F64Range(other_lo, other_hi, other_end),
+                ) => self_lo == other_lo && self_hi == other_hi && self_end == other_end,
+                (Constructor::Str(self_value), Constructor::Str(other_value)) => {
+                    self_value == other_value
+                }
+                (Constructor::Opaque(self_inner), Constructor::Opaque(other_inner)) => {
+                    self_inner == other_inner
+                }
+                (Constructor::Or, Constructor::Or) => true,
+                (Constructor::Wildcard, Constructor::Wildcard) => true,
+                (Constructor::NonExhaustive, Constructor::NonExhaustive) => true,
+                (Constructor::Hidden, Constructor::Hidden) => true,
+                (Constructor::Missing, Constructor::Missing) => true,
+                _ => unreachable!(),
+            }
+    }
+}
+
 impl<Cx: TypeCx> Constructor<Cx> {
     pub(crate) fn is_non_exhaustive(&self) -> bool {
         matches!(self, NonExhaustive)

compiler/rustc_pattern_analysis/src/lib.rs

@@ -136,23 +136,35 @@ pub trait TypeCx: Sized + fmt::Debug {
 }
 
 /// Context that provides information global to a match.
-#[derive(derivative::Derivative)]
-#[derivative(Clone(bound = ""), Copy(bound = ""))]
 pub struct MatchCtxt<'a, Cx: TypeCx> {
     /// The context for type information.
     pub tycx: &'a Cx,
 }
 
+impl<'a, Cx: TypeCx> Clone for MatchCtxt<'a, Cx> {
+    fn clone(&self) -> Self {
+        Self { tycx: self.tycx }
+    }
+}
+
+impl<'a, Cx: TypeCx> Copy for MatchCtxt<'a, Cx> {}
+
 /// The arm of a match expression.
 #[derive(Debug)]
-#[derive(derivative::Derivative)]
-#[derivative(Clone(bound = ""), Copy(bound = ""))]
 pub struct MatchArm<'p, Cx: TypeCx> {
     pub pat: &'p DeconstructedPat<'p, Cx>,
     pub has_guard: bool,
     pub arm_data: Cx::ArmData,
 }
 
+impl<'p, Cx: TypeCx> Clone for MatchArm<'p, Cx> {
+    fn clone(&self) -> Self {
+        Self { pat: self.pat, has_guard: self.has_guard, arm_data: self.arm_data }
+    }
+}
+
+impl<'p, Cx: TypeCx> Copy for MatchArm<'p, Cx> {}
+
 /// The entrypoint for this crate. Computes whether a match is exhaustive and which of its arms are
 /// useful, and runs some lints.
 #[cfg(feature = "rustc")]

compiler/rustc_pattern_analysis/src/pat.rs

@@ -218,15 +218,24 @@ impl<'p, Cx: TypeCx> fmt::Debug for DeconstructedPat<'p, Cx> {
 /// algorithm. Do not use `Wild` to represent a wildcard pattern comping from user input.
 ///
 /// This is morally `Option<&'p DeconstructedPat>` where `None` is interpreted as a wildcard.
-#[derive(derivative::Derivative)]
-#[derivative(Clone(bound = ""), Copy(bound = ""))]
 pub(crate) enum PatOrWild<'p, Cx: TypeCx> {
     /// A non-user-provided wildcard, created during specialization.
     Wild,
     /// A user-provided pattern.
     Pat(&'p DeconstructedPat<'p, Cx>),
 }
 
+impl<'p, Cx: TypeCx> Clone for PatOrWild<'p, Cx> {
+    fn clone(&self) -> Self {
+        match self {
+            PatOrWild::Wild => PatOrWild::Wild,
+            PatOrWild::Pat(pat) => PatOrWild::Pat(pat),
+        }
+    }
+}
+
+impl<'p, Cx: TypeCx> Copy for PatOrWild<'p, Cx> {}
+
 impl<'p, Cx: TypeCx> PatOrWild<'p, Cx> {
     pub(crate) fn as_pat(&self) -> Option<&'p DeconstructedPat<'p, Cx>> {
         match self {
@@ -289,14 +298,28 @@ impl<'p, Cx: TypeCx> fmt::Debug for PatOrWild<'p, Cx> {
 
 /// Same idea as `DeconstructedPat`, except this is a fictitious pattern built up for diagnostics
 /// purposes. As such they don't use interning and can be cloned.
-#[derive(derivative::Derivative)]
-#[derivative(Debug(bound = ""), Clone(bound = ""))]
 pub struct WitnessPat<Cx: TypeCx> {
     ctor: Constructor<Cx>,
     pub(crate) fields: Vec<WitnessPat<Cx>>,
     ty: Cx::Ty,
 }
 
+impl<Cx: TypeCx> Clone for WitnessPat<Cx> {
+    fn clone(&self) -> Self {
+        Self { ctor: self.ctor.clone(), fields: self.fields.clone(), ty: self.ty.clone() }
+    }
+}
+
+impl<Cx: TypeCx> fmt::Debug for WitnessPat<Cx> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_struct("WitnessPat")
+            .field("ctor", &self.ctor)
+            .field("fields", &self.fields)
+            .field("ty", &self.ty)
+            .finish()
+    }
+}
+
 impl<Cx: TypeCx> WitnessPat<Cx> {
     pub(crate) fn new(ctor: Constructor<Cx>, fields: Vec<Self>, ty: Cx::Ty) -> Self {
         Self { ctor, fields, ty }

compiler/rustc_pattern_analysis/src/rustc.rs

@@ -46,11 +46,15 @@ pub type WitnessPat<'p, 'tcx> = crate::pat::WitnessPat<RustcMatchCheckCtxt<'p, '
 ///
 /// Use `.inner()` or deref to get to the `Ty<'tcx>`.
 #[repr(transparent)]
-#[derive(derivative::Derivative)]
 #[derive(Clone, Copy)]
-#[derivative(Debug = "transparent")]
 pub struct RevealedTy<'tcx>(Ty<'tcx>);
 
+impl<'tcx> fmt::Debug for RevealedTy<'tcx> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(fmt)
+    }
+}
+
 impl<'tcx> std::ops::Deref for RevealedTy<'tcx> {
     type Target = Ty<'tcx>;
     fn deref(&self) -> &Self::Target {