Auto merge of rust-lang#81718 - m-ou-se:rollup-3ftbymt, r=m-ou-se

Rollup of 5 pull requests

Successful merges:

 - rust-lang#80394 (make const_err a future incompat lint)
 - rust-lang#81532 (Remove incorrect `delay_span_bug`)
 - rust-lang#81692 (Update clippy)
 - rust-lang#81715 (Reduce tab formatting assertions to debug only)
 - rust-lang#81716 (Fix non-existent-field ICE for generic fields.)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_errors/src/emitter.rs

@@ -645,7 +645,7 @@ impl EmitterWriter {
         margin: Margin,
     ) {
         // Tabs are assumed to have been replaced by spaces in calling code.
-        assert!(!source_string.contains('\t'));
+        debug_assert!(!source_string.contains('\t'));
         let line_len = source_string.len();
         // Create the source line we will highlight.
         let left = margin.left(line_len);

compiler/rustc_errors/src/styled_buffer.rs

@@ -15,7 +15,7 @@ impl StyledBuffer {
 
     pub fn render(&self) -> Vec<Vec<StyledString>> {
         // Tabs are assumed to have been replaced by spaces in calling code.
-        assert!(self.text.iter().all(|r| !r.contains(&'\t')));
+        debug_assert!(self.text.iter().all(|r| !r.contains(&'\t')));
 
         let mut output: Vec<Vec<StyledString>> = vec![];
         let mut styled_vec: Vec<StyledString> = vec![];

compiler/rustc_lint_defs/src/builtin.rs

@@ -255,6 +255,10 @@ declare_lint! {
     pub CONST_ERR,
     Deny,
     "constant evaluation encountered erroneous expression",
+    @future_incompatible = FutureIncompatibleInfo {
+        reference: "issue #71800 <https://github.com/rust-lang/rust/issues/71800>",
+        edition: None,
+    };
     report_in_external_macro
 }
 

compiler/rustc_typeck/src/check/check.rs

@@ -203,7 +203,6 @@ pub(super) fn check_fn<'a, 'tcx>(
         // possible cases.
         fcx.check_expr(&body.value);
         fcx.require_type_is_sized(declared_ret_ty, decl.output.span(), traits::SizedReturnType);
-        tcx.sess.delay_span_bug(decl.output.span(), "`!Sized` return type");
     } else {
         fcx.require_type_is_sized(declared_ret_ty, decl.output.span(), traits::SizedReturnType);
         fcx.check_return_expr(&body.value);

compiler/rustc_typeck/src/check/expr.rs

@@ -1974,7 +1974,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
             field_path.push(candidate_field.ident.normalize_to_macros_2_0());
             let field_ty = candidate_field.ty(self.tcx, subst);
-            if let Some((nested_fields, _)) = self.get_field_candidates(span, &field_ty) {
+            if let Some((nested_fields, subst)) = self.get_field_candidates(span, &field_ty) {
                 for field in nested_fields.iter() {
                     let ident = field.ident.normalize_to_macros_2_0();
                     if ident == target_field {

src/test/ui/array-slice-vec/array_const_index-0.rs

@@ -2,6 +2,7 @@ const A: &'static [i32] = &[];
 const B: i32 = (&A)[1];
 //~^ index out of bounds: the length is 0 but the index is 1
 //~| ERROR any use of this value will cause an error
+//~| WARN this was previously accepted by the compiler but is being phased out
 
 fn main() {
     let _ = B;

src/test/ui/array-slice-vec/array_const_index-0.stderr

@@ -7,6 +7,8 @@ LL | const B: i32 = (&A)[1];
    |                index out of bounds: the length is 0 but the index is 1
    |
    = note: `#[deny(const_err)]` on by default
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
 
 error: aborting due to previous error
 

src/test/ui/array-slice-vec/array_const_index-1.rs

@@ -2,6 +2,7 @@ const A: [i32; 0] = [];
 const B: i32 = A[1];
 //~^ index out of bounds: the length is 0 but the index is 1
 //~| ERROR any use of this value will cause an error
+//~| WARN this was previously accepted by the compiler but is being phased out
 
 fn main() {
     let _ = B;

src/test/ui/array-slice-vec/array_const_index-1.stderr

@@ -7,6 +7,8 @@ LL | const B: i32 = A[1];
    |                index out of bounds: the length is 0 but the index is 1
    |
    = note: `#[deny(const_err)]` on by default
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
 
 error: aborting due to previous error
 

src/test/ui/associated-consts/defaults-not-assumed-fail.rs

@@ -7,6 +7,7 @@ trait Tr {
     // `Self::A` must not be assumed to hold inside the trait.
     const B: u8 = Self::A + 1;
     //~^ ERROR any use of this value will cause an error
+    //~| WARN this was previously accepted by the compiler but is being phased out
 }
 
 // An impl that doesn't override any constant will NOT cause a const eval error
@@ -33,6 +34,7 @@ fn main() {
     assert_eq!(<() as Tr>::B, 0);    // causes the error above
     //~^ ERROR evaluation of constant value failed
     //~| ERROR erroneous constant used
+    //~| WARN this was previously accepted by the compiler but is being phased out
 
     assert_eq!(<u8 as Tr>::A, 254);
     assert_eq!(<u8 as Tr>::B, 255);