Auto merge of rust-lang#115762 - oli-obk:early_const_prop_lint2, r=<try>

Avoid revealing in layout_of

r? `@compiler-errors`

I feel like `layout_of` is doing too many things at once, and I don't really know why. It could allow us to if callers could decide whether to reveal opaque types.

Author: bors

.gitignore

@@ -52,6 +52,8 @@ build/
 /src/tools/x/target
 # Created by default with `src/ci/docker/run.sh`
 /obj/
+# Created on ICE during build
+rustc-ice-*.txt
 
 ## Temporary files
 *~

compiler/rustc_middle/src/ty/layout.rs

@@ -324,6 +324,7 @@ impl<'tcx> SizeSkeleton<'tcx> {
         param_env: ty::ParamEnv<'tcx>,
     ) -> Result<SizeSkeleton<'tcx>, &'tcx LayoutError<'tcx>> {
         debug_assert!(!ty.has_non_region_infer());
+        let param_env = param_env.with_reveal_all_normalized(tcx);
 
         // First try computing a static layout.
         let err = match tcx.layout_of(param_env.and(ty)) {

compiler/rustc_mir_transform/src/const_prop_lint.rs

@@ -176,7 +176,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
     ) -> ConstPropagator<'mir, 'tcx> {
         let def_id = body.source.def_id();
         let args = &GenericArgs::identity_for_item(tcx, def_id);
-        let param_env = tcx.param_env_reveal_all_normalized(def_id);
+        let param_env = tcx.param_env(def_id);
 
         let can_const_prop = CanConstProp::check(tcx, param_env, body);
         let mut ecx = InterpCx::new(

compiler/rustc_passes/src/layout_test.rs

@@ -66,7 +66,7 @@ pub fn ensure_wf<'tcx>(
 }
 
 fn dump_layout_of(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribute) {
-    let param_env = tcx.param_env(item_def_id);
+    let param_env = tcx.param_env_reveal_all_normalized(item_def_id);
     let ty = tcx.type_of(item_def_id).instantiate_identity();
     let span = tcx.def_span(item_def_id.to_def_id());
     if !ensure_wf(tcx, param_env, ty, item_def_id, span) {

compiler/rustc_symbol_mangling/src/typeid/typeid_itanium_cxx_abi.rs

@@ -1106,7 +1106,10 @@ pub fn typeid_for_instance<'tcx>(
     options: TypeIdOptions,
 ) -> String {
     let fn_abi = tcx
-        .fn_abi_of_instance(tcx.param_env(instance.def_id()).and((*instance, ty::List::empty())))
+        .fn_abi_of_instance(
+            tcx.param_env_reveal_all_normalized(instance.def_id())
+                .and((*instance, ty::List::empty())),
+        )
         .unwrap_or_else(|instance| {
             bug!("typeid_for_instance: couldn't get fn_abi of instance {:?}", instance)
         });

compiler/rustc_ty_utils/src/layout.rs

@@ -36,7 +36,6 @@ fn layout_of<'tcx>(
     let (param_env, ty) = query.into_parts();
     debug!(?ty);
 
-    let param_env = param_env.with_reveal_all_normalized(tcx);
     let unnormalized_ty = ty;
 
     // FIXME: We might want to have two different versions of `layout_of`:

src/etc/rust_analyzer_settings.json

@@ -16,7 +16,7 @@
         "compiler/rustc_codegen_gcc/Cargo.toml"
     ],
     "rust-analyzer.rustfmt.overrideCommand": [
-        "./build/host/rustfmt/bin/rustfmt",
+        "${workspaceFolder}/build/host/rustfmt/bin/rustfmt",
         "--edition=2021"
     ],
     "rust-analyzer.procMacro.server": "./build/host/stage0/libexec/rust-analyzer-proc-macro-srv",

tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-impl.stderr

@@ -4,11 +4,6 @@ error[E0391]: cycle detected when elaborating drops for `<impl at $DIR/issue-249
 LL |     const BAR: u32 = IMPL_REF_BAR;
    |                      ^^^^^^^^^^^^
    |
-note: ...which requires const-evaluating + checking `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
    |

tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait-default.stderr

@@ -4,11 +4,6 @@ error[E0391]: cycle detected when elaborating drops for `FooDefault::BAR`
 LL |     const BAR: u32 = DEFAULT_REF_BAR;
    |                      ^^^^^^^^^^^^^^^
    |
-note: ...which requires const-evaluating + checking `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
    |

tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait.stderr

@@ -4,11 +4,6 @@ error[E0391]: cycle detected when elaborating drops for `<impl at $DIR/issue-249
 LL |     const BAR: u32 = TRAIT_REF_BAR;
    |                      ^^^^^^^^^^^^^
    |
-note: ...which requires const-evaluating + checking `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
    |