Auto merge of rust-lang#119821 - oli-obk:reveal_all_const_evals, r=<try>

Always use RevealAll for const eval queries implements what is described in rust-lang#116803 (comment)
rust-lang-ci · Jan 10, 2024 · 488c25a · 488c25a
2 parents e927184 + e673a9e
commit 488c25a
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diff --git a/compiler/rustc_const_eval/src/const_eval/eval_queries.rs b/compiler/rustc_const_eval/src/const_eval/eval_queries.rs
@@ -226,16 +226,7 @@ pub fn eval_to_const_value_raw_provider<'tcx>(
     key: ty::ParamEnvAnd<'tcx, GlobalId<'tcx>>,
 ) -> ::rustc_middle::mir::interpret::EvalToConstValueResult<'tcx> {
     // see comment in eval_to_allocation_raw_provider for what we're doing here
-    if key.param_env.reveal() == Reveal::All {
-        let mut key = key;
-        key.param_env = key.param_env.with_user_facing();
-        match tcx.eval_to_const_value_raw(key) {
-            // try again with reveal all as requested
-            Err(ErrorHandled::TooGeneric(_)) => {}
-            // deduplicate calls
-            other => return other,
-        }
-    }
+    assert_eq!(key.param_env.reveal(), Reveal::All);
 
     // We call `const_eval` for zero arg intrinsics, too, in order to cache their value.
     // Catch such calls and evaluate them instead of trying to load a constant's MIR.
@@ -272,17 +263,7 @@ pub fn eval_to_allocation_raw_provider<'tcx>(
     // associated constants of generic functions will fail due to not enough monomorphization
     // information being available.
 
-    // In case we fail in the `UserFacing` variant, we just do the real computation.
-    if key.param_env.reveal() == Reveal::All {
-        let mut key = key;
-        key.param_env = key.param_env.with_user_facing();
-        match tcx.eval_to_allocation_raw(key) {
-            // try again with reveal all as requested
-            Err(ErrorHandled::TooGeneric(_)) => {}
-            // deduplicate calls
-            other => return other,
-        }
-    }
+    assert_eq!(key.param_env.reveal(), Reveal::All);
     if cfg!(debug_assertions) {
         // Make sure we format the instance even if we do not print it.
         // This serves as a regression test against an ICE on printing.

diff --git a/compiler/rustc_middle/src/mir/interpret/queries.rs b/compiler/rustc_middle/src/mir/interpret/queries.rs
@@ -145,7 +145,7 @@ impl<'tcx> TyCtxt<'tcx> {
     ) -> EvalToConstValueResult<'tcx> {
         // Const-eval shouldn't depend on lifetimes at all, so we can erase them, which should
         // improve caching of queries.
-        let inputs = self.erase_regions(param_env.and(cid));
+        let inputs = self.erase_regions(param_env.with_reveal_all_normalized(self).and(cid));
         if let Some(span) = span {
             // The query doesn't know where it is being invoked, so we need to fix the span.
             self.at(span).eval_to_const_value_raw(inputs).map_err(|e| e.with_span(span))
@@ -164,7 +164,7 @@ impl<'tcx> TyCtxt<'tcx> {
     ) -> EvalToValTreeResult<'tcx> {
         // Const-eval shouldn't depend on lifetimes at all, so we can erase them, which should
         // improve caching of queries.
-        let inputs = self.erase_regions(param_env.and(cid));
+        let inputs = self.erase_regions(param_env.with_reveal_all_normalized(self).and(cid));
         debug!(?inputs);
         if let Some(span) = span {
             // The query doesn't know where it is being invoked, so we need to fix the span.

diff --git a/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-impl.stderr b/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-impl.stderr
@@ -9,11 +9,6 @@ note: ...which requires simplifying constant for the type system `IMPL_REF_BAR`.
    |
 LL | const IMPL_REF_BAR: u32 = GlobalImplRef::BAR;
    | ^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires simplifying constant for the type system `IMPL_REF_BAR`...
-  --> $DIR/issue-24949-assoc-const-static-recursion-impl.rs:7:1
-   |
-LL | const IMPL_REF_BAR: u32 = GlobalImplRef::BAR;
-   | ^^^^^^^^^^^^^^^^^^^^^^^
 note: ...which requires const-evaluating + checking `IMPL_REF_BAR`...
   --> $DIR/issue-24949-assoc-const-static-recursion-impl.rs:7:27
    |

diff --git a/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait-default.stderr b/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait-default.stderr
@@ -9,11 +9,6 @@ note: ...which requires simplifying constant for the type system `DEFAULT_REF_BA
    |
 LL | const DEFAULT_REF_BAR: u32 = <GlobalDefaultRef>::BAR;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires simplifying constant for the type system `DEFAULT_REF_BAR`...
-  --> $DIR/issue-24949-assoc-const-static-recursion-trait-default.rs:11:1
-   |
-LL | const DEFAULT_REF_BAR: u32 = <GlobalDefaultRef>::BAR;
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
 note: ...which requires const-evaluating + checking `DEFAULT_REF_BAR`...
   --> $DIR/issue-24949-assoc-const-static-recursion-trait-default.rs:11:30
    |

diff --git a/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait.stderr b/tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait.stderr
@@ -9,11 +9,6 @@ note: ...which requires simplifying constant for the type system `TRAIT_REF_BAR`
    |
 LL | const TRAIT_REF_BAR: u32 = <GlobalTraitRef>::BAR;
    | ^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires simplifying constant for the type system `TRAIT_REF_BAR`...
-  --> $DIR/issue-24949-assoc-const-static-recursion-trait.rs:7:1
-   |
-LL | const TRAIT_REF_BAR: u32 = <GlobalTraitRef>::BAR;
-   | ^^^^^^^^^^^^^^^^^^^^^^^^
 note: ...which requires const-evaluating + checking `TRAIT_REF_BAR`...
   --> $DIR/issue-24949-assoc-const-static-recursion-trait.rs:7:28
    |

diff --git a/tests/ui/consts/const-eval/const-eval-query-stack.stderr b/tests/ui/consts/const-eval/const-eval-query-stack.stderr
@@ -7,7 +7,6 @@ LL | const X: i32 = 1 / 0;
 query stack during panic:
 #0 [eval_to_allocation_raw] const-evaluating + checking `X`
 #1 [eval_to_const_value_raw] simplifying constant for the type system `X`
-#2 [eval_to_const_value_raw] simplifying constant for the type system `X`
-#3 [lint_mod] linting top-level module
-#4 [analysis] running analysis passes on this crate
+#2 [lint_mod] linting top-level module
+#3 [analysis] running analysis passes on this crate
 end of query stack
diff --git a/tests/ui/consts/const-size_of-cycle.stderr b/tests/ui/consts/const-size_of-cycle.stderr
@@ -7,11 +7,6 @@ LL |     bytes: [u8; std::mem::size_of::<Foo>()]
 note: ...which requires const-evaluating + checking `Foo::bytes::{constant#0}`...
   --> $DIR/const-size_of-cycle.rs:4:17
    |
-LL |     bytes: [u8; std::mem::size_of::<Foo>()]
-   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires const-evaluating + checking `Foo::bytes::{constant#0}`...
-  --> $DIR/const-size_of-cycle.rs:4:17
-   |
 LL |     bytes: [u8; std::mem::size_of::<Foo>()]
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: ...which requires computing layout of `Foo`...

diff --git a/tests/ui/consts/issue-36163.stderr b/tests/ui/consts/issue-36163.stderr
@@ -20,11 +20,17 @@ note: ...which requires const-evaluating + checking `A`...
 LL | const A: isize = Foo::B as isize;
    |                  ^^^^^^^^^^^^^^^
    = note: ...which again requires simplifying constant for the type system `Foo::B::{constant#0}`, completing the cycle
-note: cycle used when simplifying constant for the type system `Foo::B::{constant#0}`
-  --> $DIR/issue-36163.rs:4:9
+note: cycle used when collecting item types in top-level module
+  --> $DIR/issue-36163.rs:1:1
    |
-LL |     B = A,
-   |         ^
+LL | / const A: isize = Foo::B as isize;
+LL | |
+LL | | enum Foo {
+LL | |     B = A,
+LL | | }
+LL | |
+LL | | fn main() {}
+   | |____________^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 1 previous error

diff --git a/tests/ui/consts/issue-44415.stderr b/tests/ui/consts/issue-44415.stderr
@@ -7,11 +7,6 @@ LL |     bytes: [u8; unsafe { intrinsics::size_of::<Foo>() }],
 note: ...which requires const-evaluating + checking `Foo::bytes::{constant#0}`...
   --> $DIR/issue-44415.rs:6:17
    |
-LL |     bytes: [u8; unsafe { intrinsics::size_of::<Foo>() }],
-   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires const-evaluating + checking `Foo::bytes::{constant#0}`...
-  --> $DIR/issue-44415.rs:6:17
-   |
 LL |     bytes: [u8; unsafe { intrinsics::size_of::<Foo>() }],
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: ...which requires computing layout of `Foo`...

diff --git a/tests/ui/consts/recursive-zst-static.default.stderr b/tests/ui/consts/recursive-zst-static.default.stderr
@@ -1,15 +1,10 @@
 error[E0391]: cycle detected when const-evaluating + checking `FOO`
-  --> $DIR/recursive-zst-static.rs:10:1
-   |
-LL | static FOO: () = FOO;
-   | ^^^^^^^^^^^^^^
-   |
-note: ...which requires const-evaluating + checking `FOO`...
   --> $DIR/recursive-zst-static.rs:10:18
    |
 LL | static FOO: () = FOO;
    |                  ^^^
-   = note: ...which again requires const-evaluating + checking `FOO`, completing the cycle
+   |
+   = note: ...which immediately requires const-evaluating + checking `FOO` again
 note: cycle used when linting top-level module
   --> $DIR/recursive-zst-static.rs:10:1
    |

diff --git a/tests/ui/consts/recursive-zst-static.unleash.stderr b/tests/ui/consts/recursive-zst-static.unleash.stderr
@@ -1,15 +1,10 @@
 error[E0391]: cycle detected when const-evaluating + checking `FOO`
-  --> $DIR/recursive-zst-static.rs:10:1
-   |
-LL | static FOO: () = FOO;
-   | ^^^^^^^^^^^^^^
-   |
-note: ...which requires const-evaluating + checking `FOO`...
   --> $DIR/recursive-zst-static.rs:10:18
    |
 LL | static FOO: () = FOO;
    |                  ^^^
-   = note: ...which again requires const-evaluating + checking `FOO`, completing the cycle
+   |
+   = note: ...which immediately requires const-evaluating + checking `FOO` again
 note: cycle used when linting top-level module
   --> $DIR/recursive-zst-static.rs:10:1
    |

diff --git a/tests/ui/consts/write-to-static-mut-in-static.stderr b/tests/ui/consts/write-to-static-mut-in-static.stderr
@@ -5,17 +5,12 @@ LL | pub static mut B: () = unsafe { A = 1; };
    |                                 ^^^^^ modifying a static's initial value from another static's initializer
 
 error[E0391]: cycle detected when const-evaluating + checking `C`
-  --> $DIR/write-to-static-mut-in-static.rs:5:1
-   |
-LL | pub static mut C: u32 = unsafe { C = 1; 0 };
-   | ^^^^^^^^^^^^^^^^^^^^^
-   |
-note: ...which requires const-evaluating + checking `C`...
   --> $DIR/write-to-static-mut-in-static.rs:5:34
    |
 LL | pub static mut C: u32 = unsafe { C = 1; 0 };
    |                                  ^^^^^
-   = note: ...which again requires const-evaluating + checking `C`, completing the cycle
+   |
+   = note: ...which immediately requires const-evaluating + checking `C` again
 note: cycle used when linting top-level module
   --> $DIR/write-to-static-mut-in-static.rs:1:1
    |

diff --git a/tests/ui/issues/issue-23302-1.stderr b/tests/ui/issues/issue-23302-1.stderr
@@ -10,11 +10,15 @@ note: ...which requires const-evaluating + checking `X::A::{constant#0}`...
 LL |     A = X::A as isize,
    |         ^^^^^^^^^^^^^
    = note: ...which again requires simplifying constant for the type system `X::A::{constant#0}`, completing the cycle
-note: cycle used when simplifying constant for the type system `X::A::{constant#0}`
-  --> $DIR/issue-23302-1.rs:4:9
+note: cycle used when collecting item types in top-level module
+  --> $DIR/issue-23302-1.rs:3:1
    |
-LL |     A = X::A as isize,
-   |         ^^^^^^^^^^^^^
+LL | / enum X {
+LL | |     A = X::A as isize,
+LL | | }
+LL | |
+LL | | fn main() { }
+   | |_____________^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 1 previous error

diff --git a/tests/ui/issues/issue-23302-2.stderr b/tests/ui/issues/issue-23302-2.stderr
@@ -10,11 +10,16 @@ note: ...which requires const-evaluating + checking `Y::A::{constant#0}`...
 LL |     A = Y::B as isize,
    |         ^^^^^^^^^^^^^
    = note: ...which again requires simplifying constant for the type system `Y::A::{constant#0}`, completing the cycle
-note: cycle used when simplifying constant for the type system `Y::A::{constant#0}`
-  --> $DIR/issue-23302-2.rs:4:9
+note: cycle used when collecting item types in top-level module
+  --> $DIR/issue-23302-2.rs:3:1
    |
-LL |     A = Y::B as isize,
-   |         ^^^^^^^^^^^^^
+LL | / enum Y {
+LL | |     A = Y::B as isize,
+LL | |     B,
+LL | | }
+LL | |
+LL | | fn main() { }
+   | |_____________^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 1 previous error

diff --git a/tests/ui/issues/issue-23302-3.stderr b/tests/ui/issues/issue-23302-3.stderr
@@ -20,11 +20,15 @@ note: ...which requires const-evaluating + checking `B`...
 LL | const B: i32 = A;
    |                ^
    = note: ...which again requires simplifying constant for the type system `A`, completing the cycle
-note: cycle used when simplifying constant for the type system `A`
+note: cycle used when linting top-level module
   --> $DIR/issue-23302-3.rs:1:1
    |
-LL | const A: i32 = B;
-   | ^^^^^^^^^^^^
+LL | / const A: i32 = B;
+LL | |
+LL | | const B: i32 = A;
+LL | |
+LL | | fn main() { }
+   | |_____________^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 1 previous error

diff --git a/tests/ui/recursion/recursive-static-definition.stderr b/tests/ui/recursion/recursive-static-definition.stderr
@@ -1,15 +1,10 @@
 error[E0391]: cycle detected when const-evaluating + checking `FOO`
-  --> $DIR/recursive-static-definition.rs:1:1
-   |
-LL | pub static FOO: u32 = FOO;
-   | ^^^^^^^^^^^^^^^^^^^
-   |
-note: ...which requires const-evaluating + checking `FOO`...
   --> $DIR/recursive-static-definition.rs:1:23
    |
 LL | pub static FOO: u32 = FOO;
    |                       ^^^
-   = note: ...which again requires const-evaluating + checking `FOO`, completing the cycle
+   |
+   = note: ...which immediately requires const-evaluating + checking `FOO` again
 note: cycle used when linting top-level module
   --> $DIR/recursive-static-definition.rs:1:1
    |

diff --git a/tests/ui/treat-err-as-bug/err.stderr b/tests/ui/treat-err-as-bug/err.stderr
@@ -8,5 +8,5 @@ error: the compiler unexpectedly panicked. this is a bug.
 
 query stack during panic:
 #0 [eval_to_allocation_raw] const-evaluating + checking `C`
-#1 [eval_to_allocation_raw] const-evaluating + checking `C`
+#1 [lint_mod] linting top-level module
 end of query stack
diff --git a/tests/ui/type-alias-enum-variants/self-in-enum-definition.stderr b/tests/ui/type-alias-enum-variants/self-in-enum-definition.stderr
@@ -4,11 +4,6 @@ error[E0391]: cycle detected when simplifying constant for the type system `Alph
 LL |     V3 = Self::V1 {} as u8 + 2,
    |          ^^^^^^^^^^^^^^^^^^^^^
    |
-note: ...which requires simplifying constant for the type system `Alpha::V3::{constant#0}`...
-  --> $DIR/self-in-enum-definition.rs:5:10
-   |
-LL |     V3 = Self::V1 {} as u8 + 2,
-   |          ^^^^^^^^^^^^^^^^^^^^^
 note: ...which requires const-evaluating + checking `Alpha::V3::{constant#0}`...
   --> $DIR/self-in-enum-definition.rs:5:10
    |