Fix issues and Update toolchain 10-26 (#2843)

Resolves issues caused by
1. rust-lang/rust#116958
2. rust-lang/rust#117103

Author: jaisnan

kani-compiler/src/codegen_cprover_gotoc/codegen/operand.rs

@@ -383,7 +383,7 @@ impl<'tcx> GotocCtx<'tcx> {
                                 assert_eq!(
                                     fields[0].name().to_string(),
                                     "case",
-                                    "Unexpected field in enum/generator. Please report your failing case at https://github.com/model-checking/kani/issues/1465"
+                                    "Unexpected field in enum/coroutine. Please report your failing case at https://github.com/model-checking/kani/issues/1465"
                                 );
                                 Expr::struct_expr_with_nondet_fields(
                                     cgt,

kani-compiler/src/codegen_cprover_gotoc/codegen/place.rs

@@ -26,7 +26,7 @@ use tracing::{debug, trace, warn};
 pub enum TypeOrVariant<'tcx> {
     Type(Ty<'tcx>),
     Variant(&'tcx VariantDef),
-    GeneratorVariant(VariantIdx),
+    CoroutineVariant(VariantIdx),
 }
 
 /// A struct for storing the data for passing to `codegen_unimplemented`
@@ -132,7 +132,7 @@ impl<'tcx> ProjectedPlace<'tcx> {
                 }
             }
             // TODO: handle Variant https://github.com/model-checking/kani/issues/448
-            TypeOrVariant::Variant(_) | TypeOrVariant::GeneratorVariant(_) => None,
+            TypeOrVariant::Variant(_) | TypeOrVariant::CoroutineVariant(_) => None,
         }
     }
 
@@ -205,7 +205,7 @@ impl<'tcx> TypeOrVariant<'tcx> {
     pub fn monomorphize(self, ctx: &GotocCtx<'tcx>) -> Self {
         match self {
             TypeOrVariant::Type(t) => TypeOrVariant::Type(ctx.monomorphize(t)),
-            TypeOrVariant::Variant(_) | TypeOrVariant::GeneratorVariant(_) => self,
+            TypeOrVariant::Variant(_) | TypeOrVariant::CoroutineVariant(_) => self,
         }
     }
 }
@@ -215,8 +215,8 @@ impl<'tcx> TypeOrVariant<'tcx> {
         match self {
             TypeOrVariant::Type(t) => *t,
             TypeOrVariant::Variant(v) => panic!("expect a type but variant is found: {v:?}"),
-            TypeOrVariant::GeneratorVariant(v) => {
-                panic!("expect a type but generator variant is found: {v:?}")
+            TypeOrVariant::CoroutineVariant(v) => {
+                panic!("expect a type but coroutine variant is found: {v:?}")
             }
         }
     }
@@ -226,8 +226,8 @@ impl<'tcx> TypeOrVariant<'tcx> {
         match self {
             TypeOrVariant::Type(t) => panic!("expect a variant but type is found: {t:?}"),
             TypeOrVariant::Variant(v) => v,
-            TypeOrVariant::GeneratorVariant(v) => {
-                panic!("expect a variant but generator variant found {v:?}")
+            TypeOrVariant::CoroutineVariant(v) => {
+                panic!("expect a variant but coroutine variant found {v:?}")
             }
         }
     }
@@ -236,7 +236,7 @@ impl<'tcx> TypeOrVariant<'tcx> {
 impl<'tcx> GotocCtx<'tcx> {
     /// Codegen field access for types that allow direct field projection.
     ///
-    /// I.e.: Algebraic data types, closures, and generators.
+    /// I.e.: Algebraic data types, closures, and coroutines.
     ///
     /// Other composite types such as array only support index projection.
     fn codegen_field(
@@ -258,7 +258,7 @@ impl<'tcx> GotocCtx<'tcx> {
                     | ty::FnPtr(_)
                     | ty::Never
                     | ty::FnDef(..)
-                    | ty::GeneratorWitness(..)
+                    | ty::CoroutineWitness(..)
                     | ty::Foreign(..)
                     | ty::Dynamic(..)
                     | ty::Bound(..)
@@ -283,8 +283,8 @@ impl<'tcx> GotocCtx<'tcx> {
                     ty::Closure(..) => {
                         Ok(parent_expr.member(field.index().to_string(), &self.symbol_table))
                     }
-                    ty::Generator(..) => {
-                        let field_name = self.generator_field_name(field.as_usize());
+                    ty::Coroutine(..) => {
+                        let field_name = self.coroutine_field_name(field.as_usize());
                         Ok(parent_expr
                             .member("direct_fields", &self.symbol_table)
                             .member(field_name, &self.symbol_table))
@@ -301,8 +301,8 @@ impl<'tcx> GotocCtx<'tcx> {
                 let field = &parent_var.fields[*field];
                 Ok(parent_expr.member(field.name.to_string(), &self.symbol_table))
             }
-            TypeOrVariant::GeneratorVariant(_var_idx) => {
-                let field_name = self.generator_field_name(field.index());
+            TypeOrVariant::CoroutineVariant(_var_idx) => {
+                let field_name = self.coroutine_field_name(field.index());
                 Ok(parent_expr.member(field_name, &self.symbol_table))
             }
         }
@@ -570,11 +570,11 @@ impl<'tcx> GotocCtx<'tcx> {
                         let variant = def.variant(idx);
                         (variant.name.as_str().into(), TypeOrVariant::Variant(variant))
                     }
-                    ty::Generator(..) => {
-                        (self.generator_variant_name(idx), TypeOrVariant::GeneratorVariant(idx))
+                    ty::Coroutine(..) => {
+                        (self.coroutine_variant_name(idx), TypeOrVariant::CoroutineVariant(idx))
                     }
                     _ => unreachable!(
-                        "cannot downcast {:?} to a variant (only enums and generators can)",
+                        "cannot downcast {:?} to a variant (only enums and coroutines can)",
                         &t.kind()
                     ),
                 };
@@ -583,7 +583,7 @@ impl<'tcx> GotocCtx<'tcx> {
                     Variants::Single { .. } => before.goto_expr,
                     Variants::Multiple { tag_encoding, .. } => match tag_encoding {
                         TagEncoding::Direct => {
-                            let cases = if t.is_generator() {
+                            let cases = if t.is_coroutine() {
                                 before.goto_expr
                             } else {
                                 before.goto_expr.member("cases", &self.symbol_table)

kani-compiler/src/codegen_cprover_gotoc/codegen/rvalue.rs

@@ -498,8 +498,8 @@ impl<'tcx> GotocCtx<'tcx> {
         }
     }
 
-    /// Create an initializer for a generator struct.
-    fn codegen_rvalue_generator(
+    /// Create an initializer for a coroutine struct.
+    fn codegen_rvalue_coroutine(
         &mut self,
         operands: &IndexVec<FieldIdx, Operand<'tcx>>,
         ty: Ty<'tcx>,
@@ -508,7 +508,7 @@ impl<'tcx> GotocCtx<'tcx> {
         let discriminant_field = match &layout.variants {
             Variants::Multiple { tag_encoding: TagEncoding::Direct, tag_field, .. } => tag_field,
             _ => unreachable!(
-                "Expected generators to have multiple variants and direct encoding, but found: {layout:?}"
+                "Expected coroutines to have multiple variants and direct encoding, but found: {layout:?}"
             ),
         };
         let overall_t = self.codegen_ty(ty);
@@ -664,7 +664,7 @@ impl<'tcx> GotocCtx<'tcx> {
                     &self.symbol_table,
                 )
             }
-            AggregateKind::Generator(_, _, _) => self.codegen_rvalue_generator(&operands, res_ty),
+            AggregateKind::Coroutine(_, _, _) => self.codegen_rvalue_coroutine(&operands, res_ty),
         }
     }
 
@@ -784,8 +784,8 @@ impl<'tcx> GotocCtx<'tcx> {
             ),
             "discriminant field (`case`) only exists for multiple variants and direct encoding"
         );
-        let expr = if ty.is_generator() {
-            // Generators are translated somewhat differently from enums (see [`GotoCtx::codegen_ty_generator`]).
+        let expr = if ty.is_coroutine() {
+            // Coroutines are translated somewhat differently from enums (see [`GotoCtx::codegen_ty_coroutine`]).
             // As a consequence, the discriminant is accessed as `.direct_fields.case` instead of just `.case`.
             place.member("direct_fields", &self.symbol_table)
         } else {

kani-compiler/src/codegen_cprover_gotoc/codegen/statement.rs

@@ -195,7 +195,7 @@ impl<'tcx> GotocCtx<'tcx> {
             TerminatorKind::FalseEdge { .. } | TerminatorKind::FalseUnwind { .. } => {
                 unreachable!("drop elaboration removes these TerminatorKind")
             }
-            TerminatorKind::Yield { .. } | TerminatorKind::GeneratorDrop => {
+            TerminatorKind::Yield { .. } | TerminatorKind::CoroutineDrop => {
                 unreachable!("we should not hit these cases") // why?
             }
             TerminatorKind::InlineAsm { .. } => self.codegen_unimplemented_stmt(