Auto merge of rust-lang#125918 - oli-obk:const_block_ice, r=compiler-errors

Revert: create const block bodies in typeck via query feeding

as per the discussion in rust-lang#125806 (comment)

It was a mistake to try to shoehorn const blocks and some specific anon consts into the same box and feed them during typeck. It turned out not simplifying anything (my hope was that we could feed `type_of` to start avoiding the huge HIR matcher, but that didn't work out), but instead making a few things more fragile.

reverts the const-block-specific parts of rust-lang#124650

`@bors` rollup=never had a small perf impact previously

fixes rust-lang#125846

r? `@compiler-errors`

Author: bors

clippy_utils/src/consts.rs

@@ -6,7 +6,7 @@ use crate::{clip, is_direct_expn_of, sext, unsext};
 use rustc_ast::ast::{self, LitFloatType, LitKind};
 use rustc_data_structures::sync::Lrc;
 use rustc_hir::def::{DefKind, Res};
-use rustc_hir::{BinOp, BinOpKind, Block, Expr, ExprKind, HirId, Item, ItemKind, Node, QPath, UnOp};
+use rustc_hir::{BinOp, BinOpKind, Block, ConstBlock, Expr, ExprKind, HirId, Item, ItemKind, Node, QPath, UnOp};
 use rustc_lexer::tokenize;
 use rustc_lint::LateContext;
 use rustc_middle::mir::interpret::{alloc_range, Scalar};
@@ -412,7 +412,7 @@ impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
     /// Simple constant folding: Insert an expression, get a constant or none.
     pub fn expr(&mut self, e: &Expr<'_>) -> Option<Constant<'tcx>> {
         match e.kind {
-            ExprKind::ConstBlock(e) | ExprKind::DropTemps(e) => self.expr(e),
+            ExprKind::ConstBlock(ConstBlock { body, .. }) => self.expr(self.lcx.tcx.hir().body(body).value), ExprKind::DropTemps(e) => self.expr(e),
             ExprKind::Path(ref qpath) => {
                 self.fetch_path_and_apply(qpath, e.hir_id, self.typeck_results.expr_ty(e), |this, result| {
                     let result = mir_to_const(this.lcx, result)?;
@@ -490,7 +490,7 @@ impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
     /// leaves the local crate.
     pub fn expr_is_empty(&mut self, e: &Expr<'_>) -> Option<bool> {
         match e.kind {
-            ExprKind::ConstBlock(e) | ExprKind::DropTemps(e) => self.expr_is_empty(e),
+            ExprKind::ConstBlock(ConstBlock { body, .. }) => self.expr_is_empty(self.lcx.tcx.hir().body(body).value), ExprKind::DropTemps(e) => self.expr_is_empty(e),
             ExprKind::Path(ref qpath) => {
                 if !self
                     .typeck_results

clippy_utils/src/hir_utils.rs

@@ -295,7 +295,7 @@ impl HirEqInterExpr<'_, '_, '_> {
                 self.eq_expr(lx, rx) && self.eq_ty(lt, rt)
             },
             (&ExprKind::Closure(_l), &ExprKind::Closure(_r)) => false,
-            (&ExprKind::ConstBlock(lb), &ExprKind::ConstBlock(rb)) => self.eq_expr(lb, rb),
+            (&ExprKind::ConstBlock(lb), &ExprKind::ConstBlock(rb)) => self.eq_body(lb.body, rb.body),
             (&ExprKind::Continue(li), &ExprKind::Continue(ri)) => {
                 both(&li.label, &ri.label, |l, r| l.ident.name == r.ident.name)
             },
@@ -769,8 +769,8 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
                 // closures inherit TypeckResults
                 self.hash_expr(self.cx.tcx.hir().body(body).value);
             },
-            ExprKind::ConstBlock(l_id) => {
-                self.hash_expr(l_id);
+            ExprKind::ConstBlock(ref l_id) => {
+                self.hash_body(l_id.body);
             },
             ExprKind::DropTemps(e) | ExprKind::Yield(e, _) => {
                 self.hash_expr(e);

tests/ui/arithmetic_side_effects.stderr

@@ -1,35 +1,11 @@
-error: arithmetic operation that can potentially result in unexpected side-effects
-  --> tests/ui/arithmetic_side_effects.rs:188:36
-   |
-LL |     let _ = const { let mut n = 1; n += 1; n };
-   |                                    ^^^^^^
-   |
-   = note: `-D clippy::arithmetic-side-effects` implied by `-D warnings`
-   = help: to override `-D warnings` add `#[allow(clippy::arithmetic_side_effects)]`
-
-error: arithmetic operation that can potentially result in unexpected side-effects
-  --> tests/ui/arithmetic_side_effects.rs:191:40
-   |
-LL |     let _ = const { let mut n = 1; n = n + 1; n };
-   |                                        ^^^^^
-
-error: arithmetic operation that can potentially result in unexpected side-effects
-  --> tests/ui/arithmetic_side_effects.rs:194:40
-   |
-LL |     let _ = const { let mut n = 1; n = 1 + n; n };
-   |                                        ^^^^^
-
-error: arithmetic operation that can potentially result in unexpected side-effects
-  --> tests/ui/arithmetic_side_effects.rs:200:59
-   |
-LL |     let _ = const { let mut n = 1; n = -1; n = -(-1); n = -n; n };
-   |                                                           ^^
-
 error: arithmetic operation that can potentially result in unexpected side-effects
   --> tests/ui/arithmetic_side_effects.rs:304:5
    |
 LL |     _n += 1;
    |     ^^^^^^^
+   |
+   = note: `-D clippy::arithmetic-side-effects` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::arithmetic_side_effects)]`
 
 error: arithmetic operation that can potentially result in unexpected side-effects
   --> tests/ui/arithmetic_side_effects.rs:305:5
@@ -751,5 +727,5 @@ error: arithmetic operation that can potentially result in unexpected side-effec
 LL |     one.sub_assign(1);
    |     ^^^^^^^^^^^^^^^^^
 
-error: aborting due to 125 previous errors
+error: aborting due to 121 previous errors