diff --git a/doc/langref.html.in b/doc/langref.html.in
index 70f11c0e2b..4359cadb58 100644
--- a/doc/langref.html.in
+++ b/doc/langref.html.in
@@ -4895,7 +4895,7 @@ pub const TypeId = enum {
     Struct,
     ComptimeFloat,
     ComptimeInt,
-    UndefinedLiteral,
+    Undefined,
     Null,
     Nullable,
     ErrorUnion,
@@ -4929,7 +4929,7 @@ pub const TypeInfo = union(TypeId) {
     Struct: Struct,
     ComptimeFloat: void,
     ComptimeInt: void,
-    UndefinedLiteral: void,
+    Undefined: void,
     Null: void,
     Nullable: Nullable,
     ErrorUnion: ErrorUnion,
@@ -5687,7 +5687,7 @@ pub const TypeId = enum {
     Struct,
     ComptimeFloat,
     ComptimeInt,
-    UndefinedLiteral,
+    Undefined,
     Null,
     Nullable,
     ErrorUnion,
@@ -5715,7 +5715,7 @@ pub const TypeInfo = union(TypeId) {
     Struct: Struct,
     ComptimeFloat: void,
     ComptimeInt: void,
-    UndefinedLiteral: void,
+    Undefined: void,
     Null: void,
     Nullable: Nullable,
     ErrorUnion: ErrorUnion,
diff --git a/src/all_types.hpp b/src/all_types.hpp
index 6b30a1155d..3b2ea02b71 100644
--- a/src/all_types.hpp
+++ b/src/all_types.hpp
@@ -1161,7 +1161,7 @@ enum TypeTableEntryId {
     TypeTableEntryIdStruct,
     TypeTableEntryIdComptimeFloat,
     TypeTableEntryIdComptimeInt,
-    TypeTableEntryIdUndefLit,
+    TypeTableEntryIdUndefined,
     TypeTableEntryIdNull,
     TypeTableEntryIdMaybe,
     TypeTableEntryIdErrorUnion,
diff --git a/src/analyze.cpp b/src/analyze.cpp
index a605cb3a7f..8008bea68d 100644
--- a/src/analyze.cpp
+++ b/src/analyze.cpp
@@ -234,7 +234,7 @@ bool type_is_complete(TypeTableEntry *type_entry) {
         case TypeTableEntryIdArray:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMaybe:
         case TypeTableEntryIdErrorUnion:
@@ -270,7 +270,7 @@ bool type_has_zero_bits_known(TypeTableEntry *type_entry) {
         case TypeTableEntryIdArray:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMaybe:
         case TypeTableEntryIdErrorUnion:
@@ -1335,7 +1335,7 @@ static bool type_allowed_in_packed_struct(TypeTableEntry *type_entry) {
         case TypeTableEntryIdUnreachable:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdErrorUnion:
         case TypeTableEntryIdErrorSet:
@@ -1376,7 +1376,7 @@ static bool type_allowed_in_extern(CodeGen *g, TypeTableEntry *type_entry) {
         case TypeTableEntryIdMetaType:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdErrorUnion:
         case TypeTableEntryIdErrorSet:
@@ -1511,7 +1511,7 @@ static TypeTableEntry *analyze_fn_type(CodeGen *g, AstNode *proto_node, Scope *c
             case TypeTableEntryIdInvalid:
                 return g->builtin_types.entry_invalid;
             case TypeTableEntryIdUnreachable:
-            case TypeTableEntryIdUndefLit:
+            case TypeTableEntryIdUndefined:
             case TypeTableEntryIdNull:
             case TypeTableEntryIdArgTuple:
             case TypeTableEntryIdOpaque:
@@ -1599,7 +1599,7 @@ static TypeTableEntry *analyze_fn_type(CodeGen *g, AstNode *proto_node, Scope *c
         case TypeTableEntryIdInvalid:
             zig_unreachable();
 
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdArgTuple:
         case TypeTableEntryIdOpaque:
@@ -3337,7 +3337,7 @@ TypeTableEntry *validate_var_type(CodeGen *g, AstNode *source_node, TypeTableEnt
         case TypeTableEntryIdInvalid:
             return g->builtin_types.entry_invalid;
         case TypeTableEntryIdUnreachable:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdBlock:
         case TypeTableEntryIdArgTuple:
@@ -3732,7 +3732,7 @@ static bool is_container(TypeTableEntry *type_entry) {
         case TypeTableEntryIdArray:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMaybe:
         case TypeTableEntryIdErrorUnion:
@@ -3781,7 +3781,7 @@ void resolve_container_type(CodeGen *g, TypeTableEntry *type_entry) {
         case TypeTableEntryIdArray:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMaybe:
         case TypeTableEntryIdErrorUnion:
@@ -4285,7 +4285,7 @@ bool handle_is_ptr(TypeTableEntry *type_entry) {
         case TypeTableEntryIdMetaType:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdNamespace:
         case TypeTableEntryIdBlock:
@@ -4672,7 +4672,7 @@ static uint32_t hash_const_val(ConstExprValue *const_val) {
         case TypeTableEntryIdPromise:
             // TODO better hashing algorithm
             return 223048345;
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
             return 162837799;
         case TypeTableEntryIdNull:
             return 844854567;
@@ -4756,7 +4756,7 @@ static bool can_mutate_comptime_var_state(ConstExprValue *value) {
         case TypeTableEntryIdFloat:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdNamespace:
         case TypeTableEntryIdBoundFn:
@@ -4821,7 +4821,7 @@ static bool return_type_is_cacheable(TypeTableEntry *return_type) {
         case TypeTableEntryIdFloat:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdNamespace:
         case TypeTableEntryIdBoundFn:
@@ -4932,7 +4932,7 @@ bool type_requires_comptime(TypeTableEntry *type_entry) {
             zig_unreachable();
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMetaType:
         case TypeTableEntryIdNamespace:
@@ -5410,7 +5410,7 @@ bool const_values_equal(ConstExprValue *a, ConstExprValue *b) {
                     return false;
             }
             return true;
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
             zig_panic("TODO");
         case TypeTableEntryIdNull:
             zig_panic("TODO");
@@ -5651,7 +5651,7 @@ void render_const_value(CodeGen *g, Buf *buf, ConstExprValue *const_val) {
                 buf_appendf(buf, "null");
                 return;
             }
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
             {
                 buf_appendf(buf, "undefined");
                 return;
@@ -5763,7 +5763,7 @@ uint32_t type_id_hash(TypeId x) {
         case TypeTableEntryIdStruct:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMaybe:
         case TypeTableEntryIdErrorSet:
@@ -5809,7 +5809,7 @@ bool type_id_eql(TypeId a, TypeId b) {
         case TypeTableEntryIdStruct:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMaybe:
         case TypeTableEntryIdPromise:
@@ -5931,7 +5931,7 @@ static const TypeTableEntryId all_type_ids[] = {
     TypeTableEntryIdStruct,
     TypeTableEntryIdComptimeFloat,
     TypeTableEntryIdComptimeInt,
-    TypeTableEntryIdUndefLit,
+    TypeTableEntryIdUndefined,
     TypeTableEntryIdNull,
     TypeTableEntryIdMaybe,
     TypeTableEntryIdErrorUnion,
@@ -5984,7 +5984,7 @@ size_t type_id_index(TypeTableEntry *entry) {
             return 9;
         case TypeTableEntryIdComptimeInt:
             return 10;
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
             return 11;
         case TypeTableEntryIdNull:
             return 12;
@@ -6042,8 +6042,8 @@ const char *type_id_name(TypeTableEntryId id) {
             return "ComptimeFloat";
         case TypeTableEntryIdComptimeInt:
             return "ComptimeInt";
-        case TypeTableEntryIdUndefLit:
-            return "UndefinedLiteral";
+        case TypeTableEntryIdUndefined:
+            return "Undefined";
         case TypeTableEntryIdNull:
             return "Null";
         case TypeTableEntryIdMaybe:
diff --git a/src/codegen.cpp b/src/codegen.cpp
index 3177a2491f..a977c34daf 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -4918,7 +4918,7 @@ static LLVMValueRef pack_const_int(CodeGen *g, LLVMTypeRef big_int_type_ref, Con
         case TypeTableEntryIdUnreachable:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdErrorUnion:
         case TypeTableEntryIdErrorSet:
@@ -5364,7 +5364,7 @@ static LLVMValueRef gen_const_val(CodeGen *g, ConstExprValue *const_val, const c
         case TypeTableEntryIdUnreachable:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdNamespace:
         case TypeTableEntryIdBlock:
@@ -6026,7 +6026,7 @@ static void define_builtin_types(CodeGen *g) {
         g->primitive_type_table.put(&entry->name, entry);
     }
     {
-        TypeTableEntry *entry = new_type_table_entry(TypeTableEntryIdUndefLit);
+        TypeTableEntry *entry = new_type_table_entry(TypeTableEntryIdUndefined);
         buf_init_from_str(&entry->name, "(undefined)");
         entry->zero_bits = true;
         g->builtin_types.entry_undef = entry;
@@ -6499,7 +6499,7 @@ static void define_builtin_compile_vars(CodeGen *g) {
             "    Struct: Struct,\n"
             "    ComptimeFloat: void,\n"
             "    ComptimeInt: void,\n"
-            "    UndefinedLiteral: void,\n"
+            "    Undefined: void,\n"
             "    Null: void,\n"
             "    Nullable: Nullable,\n"
             "    ErrorUnion: ErrorUnion,\n"
@@ -7074,7 +7074,7 @@ static void prepend_c_type_to_decl_list(CodeGen *g, GenH *gen_h, TypeTableEntry
         case TypeTableEntryIdMetaType:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdNamespace:
         case TypeTableEntryIdBlock:
@@ -7259,7 +7259,7 @@ static void get_c_type(CodeGen *g, GenH *gen_h, TypeTableEntry *type_entry, Buf
         case TypeTableEntryIdBlock:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdArgTuple:
         case TypeTableEntryIdPromise:
@@ -7412,7 +7412,7 @@ static void gen_h_file(CodeGen *g) {
             case TypeTableEntryIdComptimeFloat:
             case TypeTableEntryIdComptimeInt:
             case TypeTableEntryIdArray:
-            case TypeTableEntryIdUndefLit:
+            case TypeTableEntryIdUndefined:
             case TypeTableEntryIdNull:
             case TypeTableEntryIdErrorUnion:
             case TypeTableEntryIdErrorSet:
diff --git a/src/ir.cpp b/src/ir.cpp
index 2fbc72309a..9578795fcc 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -8142,7 +8142,7 @@ static ImplicitCastMatchResult ir_types_match_with_implicit_cast(IrAnalyze *ira,
     }
 
     // implicit undefined literal to anything
-    if (actual_type->id == TypeTableEntryIdUndefLit) {
+    if (actual_type->id == TypeTableEntryIdUndefined) {
         return ImplicitCastMatchResultYes;
     }
 
@@ -8546,11 +8546,11 @@ static TypeTableEntry *ir_resolve_peer_types(IrAnalyze *ira, AstNode *source_nod
             continue;
         }
 
-        if (cur_type->id == TypeTableEntryIdUndefLit) {
+        if (cur_type->id == TypeTableEntryIdUndefined) {
             continue;
         }
 
-        if (prev_type->id == TypeTableEntryIdUndefLit) {
+        if (prev_type->id == TypeTableEntryIdUndefined) {
             prev_inst = cur_inst;
             continue;
         }
@@ -10230,7 +10230,7 @@ static IrInstruction *ir_analyze_cast(IrAnalyze *ira, IrInstruction *source_inst
 
 
     // explicit cast from undefined to anything
-    if (actual_type->id == TypeTableEntryIdUndefLit) {
+    if (actual_type->id == TypeTableEntryIdUndefined) {
         return ir_analyze_undefined_to_anything(ira, source_instr, value, wanted_type);
     }
 
@@ -10795,7 +10795,7 @@ static TypeTableEntry *ir_analyze_bin_op_cmp(IrAnalyze *ira, IrInstructionBinOp
         case TypeTableEntryIdUnreachable:
         case TypeTableEntryIdArray:
         case TypeTableEntryIdStruct:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMaybe:
         case TypeTableEntryIdErrorUnion:
@@ -11643,7 +11643,7 @@ static VarClassRequired get_var_class_required(TypeTableEntry *type_entry) {
             return VarClassRequiredAny;
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdBlock:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdOpaque:
@@ -11912,7 +11912,7 @@ static TypeTableEntry *ir_analyze_instruction_export(IrAnalyze *ira, IrInstructi
                 case TypeTableEntryIdUnreachable:
                 case TypeTableEntryIdComptimeFloat:
                 case TypeTableEntryIdComptimeInt:
-                case TypeTableEntryIdUndefLit:
+                case TypeTableEntryIdUndefined:
                 case TypeTableEntryIdNull:
                 case TypeTableEntryIdMaybe:
                 case TypeTableEntryIdErrorUnion:
@@ -11936,7 +11936,7 @@ static TypeTableEntry *ir_analyze_instruction_export(IrAnalyze *ira, IrInstructi
         case TypeTableEntryIdArray:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMaybe:
         case TypeTableEntryIdErrorUnion:
@@ -12900,7 +12900,7 @@ static TypeTableEntry *ir_analyze_maybe(IrAnalyze *ira, IrInstructionUnOp *un_op
         case TypeTableEntryIdStruct:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMaybe:
         case TypeTableEntryIdErrorUnion:
@@ -13153,7 +13153,7 @@ static TypeTableEntry *ir_analyze_instruction_phi(IrAnalyze *ira, IrInstructionP
     if (resolved_type->id == TypeTableEntryIdComptimeFloat ||
         resolved_type->id == TypeTableEntryIdComptimeInt ||
         resolved_type->id == TypeTableEntryIdNull ||
-        resolved_type->id == TypeTableEntryIdUndefLit)
+        resolved_type->id == TypeTableEntryIdUndefined)
     {
         ir_add_error_node(ira, phi_instruction->base.source_node,
                 buf_sprintf("unable to infer expression type"));
@@ -14215,7 +14215,7 @@ static TypeTableEntry *ir_analyze_instruction_typeof(IrAnalyze *ira, IrInstructi
             zig_unreachable(); // handled above
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdNamespace:
         case TypeTableEntryIdBlock:
@@ -14479,7 +14479,7 @@ static TypeTableEntry *ir_analyze_instruction_slice_type(IrAnalyze *ira,
         case TypeTableEntryIdInvalid: // handled above
             zig_unreachable();
         case TypeTableEntryIdUnreachable:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdBlock:
         case TypeTableEntryIdArgTuple:
@@ -14587,7 +14587,7 @@ static TypeTableEntry *ir_analyze_instruction_array_type(IrAnalyze *ira,
         case TypeTableEntryIdInvalid: // handled above
             zig_unreachable();
         case TypeTableEntryIdUnreachable:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdBlock:
         case TypeTableEntryIdArgTuple:
@@ -14656,7 +14656,7 @@ static TypeTableEntry *ir_analyze_instruction_size_of(IrAnalyze *ira,
         case TypeTableEntryIdInvalid: // handled above
             zig_unreachable();
         case TypeTableEntryIdUnreachable:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdBlock:
         case TypeTableEntryIdComptimeFloat:
@@ -15099,7 +15099,7 @@ static TypeTableEntry *ir_analyze_instruction_switch_target(IrAnalyze *ira,
         case TypeTableEntryIdUnreachable:
         case TypeTableEntryIdArray:
         case TypeTableEntryIdStruct:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMaybe:
         case TypeTableEntryIdBlock:
@@ -15620,7 +15620,7 @@ static TypeTableEntry *ir_analyze_min_max(IrAnalyze *ira, IrInstruction *source_
         case TypeTableEntryIdStruct:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdMaybe:
         case TypeTableEntryIdErrorUnion:
@@ -16282,7 +16282,7 @@ static ConstExprValue *ir_make_type_info_value(IrAnalyze *ira, TypeTableEntry *t
         case TypeTableEntryIdUnreachable:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdNamespace:
         case TypeTableEntryIdBlock:
@@ -17878,7 +17878,7 @@ static TypeTableEntry *ir_analyze_instruction_align_of(IrAnalyze *ira, IrInstruc
         case TypeTableEntryIdUnreachable:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdNamespace:
         case TypeTableEntryIdBlock:
@@ -18612,7 +18612,7 @@ static void buf_write_value_bytes(CodeGen *codegen, uint8_t *buf, ConstExprValue
         case TypeTableEntryIdUnreachable:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdPromise:
             zig_unreachable();
@@ -18679,7 +18679,7 @@ static void buf_read_value_bytes(CodeGen *codegen, uint8_t *buf, ConstExprValue
         case TypeTableEntryIdUnreachable:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
         case TypeTableEntryIdPromise:
             zig_unreachable();
@@ -18760,7 +18760,7 @@ static TypeTableEntry *ir_analyze_instruction_bit_cast(IrAnalyze *ira, IrInstruc
         case TypeTableEntryIdUnreachable:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
             ir_add_error(ira, dest_type_value,
                     buf_sprintf("unable to @bitCast from type '%s'", buf_ptr(&src_type->name)));
@@ -18786,7 +18786,7 @@ static TypeTableEntry *ir_analyze_instruction_bit_cast(IrAnalyze *ira, IrInstruc
         case TypeTableEntryIdUnreachable:
         case TypeTableEntryIdComptimeFloat:
         case TypeTableEntryIdComptimeInt:
-        case TypeTableEntryIdUndefLit:
+        case TypeTableEntryIdUndefined:
         case TypeTableEntryIdNull:
             ir_add_error(ira, dest_type_value,
                     buf_sprintf("unable to @bitCast to type '%s'", buf_ptr(&dest_type->name)));
diff --git a/test/cases/misc.zig b/test/cases/misc.zig
index ed14243b39..9450cf5e6e 100644
--- a/test/cases/misc.zig
+++ b/test/cases/misc.zig
@@ -503,7 +503,7 @@ test "@typeId" {
         assert(@typeId(AStruct) == Tid.Struct);
         assert(@typeId(@typeOf(1)) == Tid.ComptimeInt);
         assert(@typeId(@typeOf(1.0)) == Tid.ComptimeFloat);
-        assert(@typeId(@typeOf(undefined)) == Tid.UndefinedLiteral);
+        assert(@typeId(@typeOf(undefined)) == Tid.Undefined);
         assert(@typeId(@typeOf(null)) == Tid.Null);
         assert(@typeId(?i32) == Tid.Nullable);
         assert(@typeId(error!i32) == Tid.ErrorUnion);