Rollup merge of rust-lang#59781 - whitfin:issue-59378, r=oli-obk

Remove check_match from const_eval

This fixes rust-lang#59378.

It seems that the `check_match` may be unnecessary, so this removes it per instructions provided in the issue. I re-ran the tests for `librustc_mir` and everything seemed fine!

Author: Centril

src/librustc_mir/const_eval.rs

@@ -615,22 +615,9 @@ pub fn const_eval_raw_provider<'a, 'tcx>(
     let cid = key.value;
     let def_id = cid.instance.def.def_id();
 
-    if let Some(id) = tcx.hir().as_local_hir_id(def_id) {
-        let tables = tcx.typeck_tables_of(def_id);
-
-        // Do match-check before building MIR
-        // FIXME(#59378) check_match may have errored but we're not checking for that anymore
-        tcx.check_match(def_id);
-
-        if let hir::BodyOwnerKind::Const = tcx.hir().body_owner_kind_by_hir_id(id) {
-            tcx.mir_const_qualif(def_id);
-        }
-
-        // Do not continue into miri if typeck errors occurred; it will fail horribly
-        if tables.tainted_by_errors {
-            return Err(ErrorHandled::Reported)
-        }
-    };
+    if def_id.is_local() && tcx.typeck_tables_of(def_id).tainted_by_errors {
+        return Err(ErrorHandled::Reported);
+    }
 
     let (res, ecx) = eval_body_and_ecx(tcx, cid, None, key.param_env);
     res.and_then(|place| {

src/test/ui/issues/issue-23302-1.stderr

@@ -5,7 +5,7 @@ LL |     A = X::A as isize,
    |         ^^^^^^^^^^^^^
    |
    = note: ...which again requires processing `X::A::{{constant}}#0`, completing the cycle
-note: cycle used when const-evaluating `X::A::{{constant}}#0`
+note: cycle used when processing `X::A::{{constant}}#0`
   --> $DIR/issue-23302-1.rs:4:9
    |
 LL |     A = X::A as isize,

src/test/ui/issues/issue-23302-2.stderr

@@ -5,7 +5,7 @@ LL |     A = Y::B as isize,
    |         ^^^^^^^^^^^^^
    |
    = note: ...which again requires processing `Y::A::{{constant}}#0`, completing the cycle
-note: cycle used when const-evaluating `Y::A::{{constant}}#0`
+note: cycle used when processing `Y::A::{{constant}}#0`
   --> $DIR/issue-23302-2.rs:4:9
    |
 LL |     A = Y::B as isize,

src/test/ui/issues/issue-36163.stderr

@@ -10,7 +10,7 @@ note: ...which requires processing `A`...
 LL | const A: isize = Foo::B as isize;
    |                  ^^^^^^^^^^^^^^^
    = note: ...which again requires processing `Foo::B::{{constant}}#0`, completing the cycle
-note: cycle used when const-evaluating `Foo::B::{{constant}}#0`
+note: cycle used when processing `Foo::B::{{constant}}#0`
   --> $DIR/issue-36163.rs:4:9
    |
 LL |     B = A,

src/test/ui/issues/issue-51714.rs

@@ -10,5 +10,4 @@ fn main() {
 
     [(); return while let Some(n) = Some(0) {}];
     //~^ ERROR return statement outside of function body
-    //~^^ WARN irrefutable while-let pattern
 }

src/test/ui/issues/issue-51714.stderr

@@ -22,14 +22,6 @@ error[E0572]: return statement outside of function body
 LL |     [(); return while let Some(n) = Some(0) {}];
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-warning: irrefutable while-let pattern
-  --> $DIR/issue-51714.rs:11:17
-   |
-LL |     [(); return while let Some(n) = Some(0) {}];
-   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: #[warn(irrefutable_let_patterns)] on by default
-
 error: aborting due to 4 previous errors
 
 For more information about this error, try `rustc --explain E0572`.