Check signature WF when lowering MIR body

compiler/rustc_hir_analysis/src/check/check.rs

@@ -745,14 +745,10 @@ fn check_static_linkage(tcx: TyCtxt<'_>, def_id: LocalDefId) {
 pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
     match tcx.def_kind(def_id) {
         DefKind::Static { .. } => {
-            tcx.ensure_ok().typeck(def_id);
-            maybe_check_static_with_link_section(tcx, def_id);
             check_static_inhabited(tcx, def_id);
             check_static_linkage(tcx, def_id);
         }
-        DefKind::Const => {
-            tcx.ensure_ok().typeck(def_id);
-        }
+        DefKind::Const => {}
         DefKind::Enum => {
             check_enum(tcx, def_id);
         }
@@ -766,7 +762,6 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
                     ExternAbi::Rust,
                 )
             }
-            // Everything else is checked entirely within check_item_body
         }
         DefKind::Impl { of_trait } => {
             if of_trait && let Some(impl_trait_header) = tcx.impl_trait_header(def_id) {

compiler/rustc_hir_analysis/src/check/mod.rs

@@ -145,7 +145,7 @@ pub fn forbid_intrinsic_abi(tcx: TyCtxt<'_>, sp: Span, abi: ExternAbi) {
     }
 }
 
-fn maybe_check_static_with_link_section(tcx: TyCtxt<'_>, id: LocalDefId) {
+pub(super) fn maybe_check_static_with_link_section(tcx: TyCtxt<'_>, id: LocalDefId) {
     // Only restricted on wasm target for now
     if !tcx.sess.target.is_like_wasm {
         return;

compiler/rustc_hir_analysis/src/lib.rs

@@ -212,7 +212,10 @@ pub fn check_crate(tcx: TyCtxt<'_>) {
     tcx.par_hir_body_owners(|item_def_id| {
         let def_kind = tcx.def_kind(item_def_id);
         match def_kind {
-            DefKind::Static { .. } => tcx.ensure_ok().eval_static_initializer(item_def_id),
+            DefKind::Static { .. } => {
+                tcx.ensure_ok().eval_static_initializer(item_def_id);
+                check::maybe_check_static_with_link_section(tcx, item_def_id);
+            }
             DefKind::Const if tcx.generics_of(item_def_id).is_empty() => {
                 let instance = ty::Instance::new(item_def_id.into(), ty::GenericArgs::empty());
                 let cid = GlobalId { instance, promoted: None };
@@ -223,12 +226,9 @@ pub fn check_crate(tcx: TyCtxt<'_>) {
         }
     });
 
-    // FIXME: Remove this when we implement creating `DefId`s
-    // for anon constants during their parents' typeck.
-    // Typeck all body owners in parallel will produce queries
-    // cycle errors because it may typeck on anon constants directly.
     tcx.par_hir_body_owners(|item_def_id| {
         let def_kind = tcx.def_kind(item_def_id);
+        // Skip `AnonConst`s because we feed their `type_of`.
         if !matches!(def_kind, DefKind::AnonConst) {
             tcx.ensure_ok().typeck(item_def_id);
         }

tests/rustdoc-ui/issues/issue-79494.rs

@@ -2,4 +2,4 @@
 
 #![feature(const_transmute)]
 
-const ZST: &[u8] = unsafe { std::mem::transmute(1usize) }; //~ ERROR cannot transmute between types of different sizes, or dependently-sized types
+pub const ZST: &[u8] = unsafe { std::mem::transmute(1usize) }; //~ ERROR cannot transmute between types of different sizes, or dependently-sized types

tests/rustdoc-ui/issues/issue-79494.stderr

@@ -1,8 +1,8 @@
 error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
-  --> $DIR/issue-79494.rs:5:29
+  --> $DIR/issue-79494.rs:5:33
    |
-LL | const ZST: &[u8] = unsafe { std::mem::transmute(1usize) };
-   |                             ^^^^^^^^^^^^^^^^^^^
+LL | pub const ZST: &[u8] = unsafe { std::mem::transmute(1usize) };
+   |                                 ^^^^^^^^^^^^^^^^^^^
    |
    = note: source type: `usize` (64 bits)
    = note: target type: `&[u8]` (128 bits)

tests/rustdoc-ui/track-diagnostics.rs

@@ -7,4 +7,5 @@
 
 struct A;
 struct B;
-const S: A = B;
+
+pub const S: A = B;

tests/rustdoc-ui/track-diagnostics.stderr

@@ -1,8 +1,8 @@
 error[E0308]: mismatched types
   --> $DIR/track-diagnostics.rs:LL:CC
    |
-LL | const S: A = B;
-   |              ^ expected `A`, found `B`
+LL | pub const S: A = B;
+   |                  ^ expected `A`, found `B`
 -Ztrack-diagnostics: created at compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs:LL:CC
 
 error: aborting due to 1 previous error

tests/ui/const-generics/generic_const_exprs/unevaluated-const-ice-119731.stderr

@@ -54,12 +54,6 @@ warning: type `v17` should have an upper camel case name
 LL |     pub struct v17<const v10: usize, const v7: v11> {
    |                ^^^ help: convert the identifier to upper camel case (notice the capitalization): `V17`
 
-error[E0425]: cannot find function `v6` in this scope
-  --> $DIR/unevaluated-const-ice-119731.rs:13:35
-   |
-LL |     const v0: [[usize; v4]; v4] = v6(v8);
-   |                                   ^^ not found in this scope
-
 error: `[[usize; v4]; v4]` is forbidden as the type of a const generic parameter
   --> $DIR/unevaluated-const-ice-119731.rs:16:48
    |
@@ -72,6 +66,12 @@ help: add `#![feature(adt_const_params)]` to the crate attributes to enable more
 LL + #![feature(adt_const_params)]
    |
 
+error[E0425]: cannot find function `v6` in this scope
+  --> $DIR/unevaluated-const-ice-119731.rs:13:35
+   |
+LL |     const v0: [[usize; v4]; v4] = v6(v8);
+   |                                   ^^ not found in this scope
+
 error: maximum number of nodes exceeded in constant v20::v17::<v10, v2>::{constant#0}
   --> $DIR/unevaluated-const-ice-119731.rs:28:37
    |

tests/ui/consts/issue-39974.stderr

@@ -1,3 +1,9 @@
+error[E0308]: mismatched types
+  --> $DIR/issue-39974.rs:5:19
+   |
+LL |     f: [[f64; 2]; LENGTH],
+   |                   ^^^^^^ expected `usize`, found `f64`
+
 error[E0308]: mismatched types
   --> $DIR/issue-39974.rs:1:21
    |
@@ -9,12 +15,6 @@ help: use a float literal
 LL | const LENGTH: f64 = 2.0;
    |                      ++
 
-error[E0308]: mismatched types
-  --> $DIR/issue-39974.rs:5:19
-   |
-LL |     f: [[f64; 2]; LENGTH],
-   |                   ^^^^^^ expected `usize`, found `f64`
-
 error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0308`.

tests/ui/layout/issue-84108.stderr

@@ -29,6 +29,15 @@ LL | const BAR: (&Path, [u8], usize) = ("hello", [], 42);
    = help: the trait `Sized` is not implemented for `[u8]`
    = note: only the last element of a tuple may have a dynamically sized type
 
+error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
+  --> $DIR/issue-84108.rs:15:13
+   |
+LL | static BAZ: ([u8], usize) = ([], 0);
+   |             ^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `[u8]`
+   = note: only the last element of a tuple may have a dynamically sized type
+
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
   --> $DIR/issue-84108.rs:9:12
    |
@@ -48,15 +57,6 @@ LL | const BAR: (&Path, [u8], usize) = ("hello", [], 42);
    = note: expected slice `[u8]`
               found array `[_; 0]`
 
-error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
-  --> $DIR/issue-84108.rs:15:13
-   |
-LL | static BAZ: ([u8], usize) = ([], 0);
-   |             ^^^^^^^^^^^^^ doesn't have a size known at compile-time
-   |
-   = help: the trait `Sized` is not implemented for `[u8]`
-   = note: only the last element of a tuple may have a dynamically sized type
-
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
   --> $DIR/issue-84108.rs:15:13
    |

tests/ui/type-alias-impl-trait/issue-53092-2.rs

@@ -2,10 +2,12 @@
 #![allow(dead_code)]
 
 type Bug<T, U> = impl Fn(T) -> U + Copy;
+//~^ ERROR cycle detected
 
 const CONST_BUG: Bug<u8, ()> = unsafe { std::mem::transmute(|_: u8| ()) };
-//~^ ERROR cycle detected
-//~| ERROR: non-defining opaque type use
+//~^ ERROR item does not constrain `Bug::{opaque#0}`, but has it in its signature
+//~| ERROR item does not constrain `Bug::{opaque#0}`, but has it in its signature
+//~| ERROR non-defining opaque type use in defining scope
 
 fn make_bug<T, U: From<T>>() -> Bug<T, U> {
     |x| x.into()

tests/ui/type-alias-impl-trait/issue-53092-2.stderr

@@ -1,5 +1,5 @@
 error[E0792]: non-defining opaque type use in defining scope
-  --> $DIR/issue-53092-2.rs:6:18
+  --> $DIR/issue-53092-2.rs:7:18
    |
 LL | const CONST_BUG: Bug<u8, ()> = unsafe { std::mem::transmute(|_: u8| ()) };
    |                  ^^^^^^^^^^^ argument `u8` is not a generic parameter
@@ -10,33 +10,59 @@ note: for this opaque type
 LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
    |                  ^^^^^^^^^^^^^^^^^^^^^^
 
-error[E0391]: cycle detected when type-checking `CONST_BUG`
-  --> $DIR/issue-53092-2.rs:6:1
+error[E0391]: cycle detected when computing type of `Bug::{opaque#0}`
+  --> $DIR/issue-53092-2.rs:4:18
+   |
+LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
+   |                  ^^^^^^^^^^^^^^^^^^^^^^
+   |
+note: ...which requires computing type of opaque `Bug::{opaque#0}`...
+  --> $DIR/issue-53092-2.rs:4:18
+   |
+LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
+   |                  ^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires type-checking `CONST_BUG`...
+  --> $DIR/issue-53092-2.rs:7:1
    |
 LL | const CONST_BUG: Bug<u8, ()> = unsafe { std::mem::transmute(|_: u8| ()) };
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
    = note: ...which requires computing layout of `Bug<u8, ()>`...
    = note: ...which requires normalizing `Bug<u8, ()>`...
-note: ...which requires computing type of `Bug::{opaque#0}`...
+   = note: ...which again requires computing type of `Bug::{opaque#0}`, completing the cycle
+note: cycle used when checking that `Bug::{opaque#0}` is well-formed
   --> $DIR/issue-53092-2.rs:4:18
    |
 LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
    |                  ^^^^^^^^^^^^^^^^^^^^^^
-note: ...which requires computing type of opaque `Bug::{opaque#0}`...
+   = 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: item does not constrain `Bug::{opaque#0}`, but has it in its signature
+  --> $DIR/issue-53092-2.rs:7:7
+   |
+LL | const CONST_BUG: Bug<u8, ()> = unsafe { std::mem::transmute(|_: u8| ()) };
+   |       ^^^^^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
   --> $DIR/issue-53092-2.rs:4:18
    |
 LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
    |                  ^^^^^^^^^^^^^^^^^^^^^^
-   = note: ...which again requires type-checking `CONST_BUG`, completing the cycle
-note: cycle used when checking that `CONST_BUG` is well-formed
-  --> $DIR/issue-53092-2.rs:6:1
+
+error: item does not constrain `Bug::{opaque#0}`, but has it in its signature
+  --> $DIR/issue-53092-2.rs:7:61
    |
 LL | const CONST_BUG: Bug<u8, ()> = unsafe { std::mem::transmute(|_: u8| ()) };
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = 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
+   |                                                             ^^^^^^^
+   |
+   = note: consider moving the opaque type's declaration and defining uses into a separate module
+note: this opaque type is in the signature
+  --> $DIR/issue-53092-2.rs:4:18
+   |
+LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
+   |                  ^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 2 previous errors
+error: aborting due to 4 previous errors
 
 Some errors have detailed explanations: E0391, E0792.
 For more information about an error, try `rustc --explain E0391`.

tests/ui/wf/wf-normalization-sized.next.stderr

@@ -7,16 +7,6 @@ LL | const _: <[[[[[[u8]]]]]] as WellUnformed>::RequestNormalize = ();
    = help: the trait `Sized` is not implemented for `[[[[[u8]]]]]`
    = note: slice and array elements must have `Sized` type
 
-error[E0277]: the size for values of type `[[[[[u8]]]]]` cannot be known at compilation time
-  --> $DIR/wf-normalization-sized.rs:19:11
-   |
-LL | const _: <[[[[[[u8]]]]]] as WellUnformed>::RequestNormalize = ();
-   |           ^^^^^^^^^^^^^^ doesn't have a size known at compile-time
-   |
-   = help: the trait `Sized` is not implemented for `[[[[[u8]]]]]`
-   = note: slice and array elements must have `Sized` type
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
-
 error[E0277]: the size for values of type `str` cannot be known at compilation time
   --> $DIR/wf-normalization-sized.rs:22:11
    |
@@ -27,6 +17,16 @@ LL | const _: <Vec<str> as WellUnformed>::RequestNormalize = ();
 note: required by an implicit `Sized` bound in `Vec`
   --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
 
+error[E0277]: the size for values of type `[[[[[u8]]]]]` cannot be known at compilation time
+  --> $DIR/wf-normalization-sized.rs:19:11
+   |
+LL | const _: <[[[[[[u8]]]]]] as WellUnformed>::RequestNormalize = ();
+   |           ^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `[[[[[u8]]]]]`
+   = note: slice and array elements must have `Sized` type
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
 error[E0277]: the size for values of type `str` cannot be known at compilation time
   --> $DIR/wf-normalization-sized.rs:22:11
    |