diff --git a/src/wren_common.h b/src/wren_common.h
index 8e1ce35a..2b7821fb 100644
--- a/src/wren_common.h
+++ b/src/wren_common.h
@@ -63,6 +63,13 @@
 // extra spaces added to handle arity, and another byte to terminate the string.
 #define MAX_METHOD_SIGNATURE (MAX_METHOD_NAME + MAX_PARAMETERS + 1)
 
+// The maximum number of fields a class can have, including inherited fields.
+// This is explicit in the bytecode since `CODE_CLASS` and `CODE_SUBCLASS` take
+// a single byte for the number of fields. Note that it's 255 and not 256
+// because creating a class takes the *number* of fields, not the *highest
+// field index*.
+#define MAX_FIELDS (255)
+
 // Assertions are used to validate program invariants. They indicate things the
 // program expects to be true about its internal state during execution. If an
 // assertion fails, there is a bug in Wren.
diff --git a/src/wren_compiler.c b/src/wren_compiler.c
index be7ba9d0..246e14f2 100644
--- a/src/wren_compiler.c
+++ b/src/wren_compiler.c
@@ -1504,6 +1504,11 @@ static void field(Compiler* compiler, bool allowAssignment)
     field = wrenSymbolTableEnsure(compiler->parser->vm, compiler->fields,
         compiler->parser->previous.start,
         compiler->parser->previous.length);
+
+    if (field >= MAX_FIELDS)
+    {
+      error(compiler, "A class can only have %d fields.", MAX_FIELDS);
+    }
   }
   else
   {
@@ -1513,8 +1518,6 @@ static void field(Compiler* compiler, bool allowAssignment)
     field = 255;
   }
 
-  // TODO: Make sure field number fits in byte.
-
   // If there's an "=" after a field name, it's an assignment.
   if (match(compiler, TOKEN_EQ))
   {
@@ -2350,7 +2353,6 @@ void statement(Compiler* compiler)
 static void classDefinition(Compiler* compiler)
 {
   // Create a variable to store the class in.
-  // TODO: Allow anonymous classes?
   int symbol = declareVariable(compiler);
 
   // Load the superclass (if there is one).
@@ -2522,10 +2524,10 @@ void wrenBindMethodCode(ObjClass* classObj, ObjFn* fn)
       case CODE_STORE_FIELD:
       case CODE_LOAD_FIELD_THIS:
       case CODE_STORE_FIELD_THIS:
-        // Shift this class's fields down past the inherited ones.
+        // Shift this class's fields down past the inherited ones. We don't
+        // check for overflow here because we'll see if the number of fields
+        // overflows when the subclass is created.
         fn->bytecode[ip++] += classObj->superclass->numFields;
-
-        // TODO: Make sure field number still fits in byte.
         break;
 
       case CODE_CLOSURE:
diff --git a/src/wren_vm.c b/src/wren_vm.c
index 71206520..8835a346 100644
--- a/src/wren_vm.c
+++ b/src/wren_vm.c
@@ -530,6 +530,22 @@ static void methodNotFound(WrenVM* vm, ObjFiber* fiber, Value* receiver,
   wrenDebugPrintStackTrace(vm, fiber, *receiver);
 }
 
+static void tooManyInheritedFields(WrenVM* vm, ObjFiber* fiber, Value* slot)
+{
+  // TODO: Tune size.
+  char message[200];
+
+  // TODO: Include class name in message. Mention inheritance.
+  snprintf(message, 200,
+      "A class may not have more than %d fields, including inherited ones.",
+      MAX_FIELDS);
+
+  // Store the error message in the receiver slot so that it's on the fiber's
+  // stack and doesn't get garbage collected.
+  *slot = wrenNewString(vm, message, strlen(message));
+  wrenDebugPrintStackTrace(vm, fiber, *slot);
+}
+
 // Pushes [function] onto [fiber]'s callstack and invokes it. Expects [numArgs]
 // arguments (including the receiver) to be on the top of the stack already.
 // [function] can be an `ObjFn` or `ObjClosure`.
@@ -1181,6 +1197,16 @@ static bool runInterpreter(WrenVM* vm)
 
       ObjClass* classObj = wrenNewClass(vm, superclass, numFields);
 
+      // Now that we know the total number of fields, make sure we don't
+      // overflow.
+      // TODO: Same check for static fields.
+      if (superclass->numFields + numFields > MAX_FIELDS)
+      {
+        STORE_FRAME();
+        tooManyInheritedFields(vm, fiber, &fiber->stack[fiber->stackSize - 1]);
+        return false;
+      }
+      
       // Don't pop the superclass off the stack until the subclass is done
       // being created, to make sure it doesn't get collected.
       if (isSubclass) POP();
diff --git a/test/limit/many_fields.wren b/test/limit/many_fields.wren
new file mode 100644
index 00000000..f6d47963
--- /dev/null
+++ b/test/limit/many_fields.wren
@@ -0,0 +1,262 @@
+class Foo {
+  new {
+    _field1 = 1
+    _field2 = 2
+    _field3 = 3
+    _field4 = 4
+    _field5 = 5
+    _field6 = 6
+    _field7 = 7
+    _field8 = 8
+    _field9 = 9
+    _field10 = 10
+    _field11 = 11
+    _field12 = 12
+    _field13 = 13
+    _field14 = 14
+    _field15 = 15
+    _field16 = 16
+    _field17 = 17
+    _field18 = 18
+    _field19 = 19
+    _field20 = 20
+    _field21 = 21
+    _field22 = 22
+    _field23 = 23
+    _field24 = 24
+    _field25 = 25
+    _field26 = 26
+    _field27 = 27
+    _field28 = 28
+    _field29 = 29
+    _field30 = 30
+    _field31 = 31
+    _field32 = 32
+    _field33 = 33
+    _field34 = 34
+    _field35 = 35
+    _field36 = 36
+    _field37 = 37
+    _field38 = 38
+    _field39 = 39
+    _field40 = 40
+    _field41 = 41
+    _field42 = 42
+    _field43 = 43
+    _field44 = 44
+    _field45 = 45
+    _field46 = 46
+    _field47 = 47
+    _field48 = 48
+    _field49 = 49
+    _field50 = 50
+    _field51 = 51
+    _field52 = 52
+    _field53 = 53
+    _field54 = 54
+    _field55 = 55
+    _field56 = 56
+    _field57 = 57
+    _field58 = 58
+    _field59 = 59
+    _field60 = 60
+    _field61 = 61
+    _field62 = 62
+    _field63 = 63
+    _field64 = 64
+    _field65 = 65
+    _field66 = 66
+    _field67 = 67
+    _field68 = 68
+    _field69 = 69
+    _field70 = 70
+    _field71 = 71
+    _field72 = 72
+    _field73 = 73
+    _field74 = 74
+    _field75 = 75
+    _field76 = 76
+    _field77 = 77
+    _field78 = 78
+    _field79 = 79
+    _field80 = 80
+    _field81 = 81
+    _field82 = 82
+    _field83 = 83
+    _field84 = 84
+    _field85 = 85
+    _field86 = 86
+    _field87 = 87
+    _field88 = 88
+    _field89 = 89
+    _field90 = 90
+    _field91 = 91
+    _field92 = 92
+    _field93 = 93
+    _field94 = 94
+    _field95 = 95
+    _field96 = 96
+    _field97 = 97
+    _field98 = 98
+    _field99 = 99
+    _field100 = 100
+    _field101 = 101
+    _field102 = 102
+    _field103 = 103
+    _field104 = 104
+    _field105 = 105
+    _field106 = 106
+    _field107 = 107
+    _field108 = 108
+    _field109 = 109
+    _field110 = 110
+    _field111 = 111
+    _field112 = 112
+    _field113 = 113
+    _field114 = 114
+    _field115 = 115
+    _field116 = 116
+    _field117 = 117
+    _field118 = 118
+    _field119 = 119
+    _field120 = 120
+    _field121 = 121
+    _field122 = 122
+    _field123 = 123
+    _field124 = 124
+    _field125 = 125
+    _field126 = 126
+    _field127 = 127
+    _field128 = 128
+    _field129 = 129
+    _field130 = 130
+    _field131 = 131
+    _field132 = 132
+    _field133 = 133
+    _field134 = 134
+    _field135 = 135
+    _field136 = 136
+    _field137 = 137
+    _field138 = 138
+    _field139 = 139
+    _field140 = 140
+    _field141 = 141
+    _field142 = 142
+    _field143 = 143
+    _field144 = 144
+    _field145 = 145
+    _field146 = 146
+    _field147 = 147
+    _field148 = 148
+    _field149 = 149
+    _field150 = 150
+    _field151 = 151
+    _field152 = 152
+    _field153 = 153
+    _field154 = 154
+    _field155 = 155
+    _field156 = 156
+    _field157 = 157
+    _field158 = 158
+    _field159 = 159
+    _field160 = 160
+    _field161 = 161
+    _field162 = 162
+    _field163 = 163
+    _field164 = 164
+    _field165 = 165
+    _field166 = 166
+    _field167 = 167
+    _field168 = 168
+    _field169 = 169
+    _field170 = 170
+    _field171 = 171
+    _field172 = 172
+    _field173 = 173
+    _field174 = 174
+    _field175 = 175
+    _field176 = 176
+    _field177 = 177
+    _field178 = 178
+    _field179 = 179
+    _field180 = 180
+    _field181 = 181
+    _field182 = 182
+    _field183 = 183
+    _field184 = 184
+    _field185 = 185
+    _field186 = 186
+    _field187 = 187
+    _field188 = 188
+    _field189 = 189
+    _field190 = 190
+    _field191 = 191
+    _field192 = 192
+    _field193 = 193
+    _field194 = 194
+    _field195 = 195
+    _field196 = 196
+    _field197 = 197
+    _field198 = 198
+    _field199 = 199
+    _field200 = 200
+    _field201 = 201
+    _field202 = 202
+    _field203 = 203
+    _field204 = 204
+    _field205 = 205
+    _field206 = 206
+    _field207 = 207
+    _field208 = 208
+    _field209 = 209
+    _field210 = 210
+    _field211 = 211
+    _field212 = 212
+    _field213 = 213
+    _field214 = 214
+    _field215 = 215
+    _field216 = 216
+    _field217 = 217
+    _field218 = 218
+    _field219 = 219
+    _field220 = 220
+    _field221 = 221
+    _field222 = 222
+    _field223 = 223
+    _field224 = 224
+    _field225 = 225
+    _field226 = 226
+    _field227 = 227
+    _field228 = 228
+    _field229 = 229
+    _field230 = 230
+    _field231 = 231
+    _field232 = 232
+    _field233 = 233
+    _field234 = 234
+    _field235 = 235
+    _field236 = 236
+    _field237 = 237
+    _field238 = 238
+    _field239 = 239
+    _field240 = 240
+    _field241 = 241
+    _field242 = 242
+    _field243 = 243
+    _field244 = 244
+    _field245 = 245
+    _field246 = 246
+    _field247 = 247
+    _field248 = 248
+    _field249 = 249
+    _field250 = 250
+    _field251 = 251
+    _field252 = 252
+    _field253 = 253
+    _field254 = 254
+    _field255 = 255
+    IO.print(_field255)
+  }
+}
+
+var foo = new Foo // expect: 255
diff --git a/test/limit/many_inherited_fields.wren b/test/limit/many_inherited_fields.wren
new file mode 100644
index 00000000..b75632f9
--- /dev/null
+++ b/test/limit/many_inherited_fields.wren
@@ -0,0 +1,280 @@
+class Foo {
+  new {
+    _field1 = 1
+    _field2 = 2
+    _field3 = 3
+    _field4 = 4
+    _field5 = 5
+    _field6 = 6
+    _field7 = 7
+    _field8 = 8
+    _field9 = 9
+    _field10 = 10
+    _field11 = 11
+    _field12 = 12
+    _field13 = 13
+    _field14 = 14
+    _field15 = 15
+    _field16 = 16
+    _field17 = 17
+    _field18 = 18
+    _field19 = 19
+    _field20 = 20
+    _field21 = 21
+    _field22 = 22
+    _field23 = 23
+    _field24 = 24
+    _field25 = 25
+    _field26 = 26
+    _field27 = 27
+    _field28 = 28
+    _field29 = 29
+    _field30 = 30
+    _field31 = 31
+    _field32 = 32
+    _field33 = 33
+    _field34 = 34
+    _field35 = 35
+    _field36 = 36
+    _field37 = 37
+    _field38 = 38
+    _field39 = 39
+    _field40 = 40
+    _field41 = 41
+    _field42 = 42
+    _field43 = 43
+    _field44 = 44
+    _field45 = 45
+    _field46 = 46
+    _field47 = 47
+    _field48 = 48
+    _field49 = 49
+    _field50 = 50
+    _field51 = 51
+    _field52 = 52
+    _field53 = 53
+    _field54 = 54
+    _field55 = 55
+    _field56 = 56
+    _field57 = 57
+    _field58 = 58
+    _field59 = 59
+    _field60 = 60
+    _field61 = 61
+    _field62 = 62
+    _field63 = 63
+    _field64 = 64
+    _field65 = 65
+    _field66 = 66
+    _field67 = 67
+    _field68 = 68
+    _field69 = 69
+    _field70 = 70
+    _field71 = 71
+    _field72 = 72
+    _field73 = 73
+    _field74 = 74
+    _field75 = 75
+    _field76 = 76
+    _field77 = 77
+    _field78 = 78
+    _field79 = 79
+    _field80 = 80
+    _field81 = 81
+    _field82 = 82
+    _field83 = 83
+    _field84 = 84
+    _field85 = 85
+    _field86 = 86
+    _field87 = 87
+    _field88 = 88
+    _field89 = 89
+    _field90 = 90
+    _field91 = 91
+    _field92 = 92
+    _field93 = 93
+    _field94 = 94
+    _field95 = 95
+    _field96 = 96
+    _field97 = 97
+    _field98 = 98
+    _field99 = 99
+    _field100 = 100
+    _field101 = 101
+    _field102 = 102
+    _field103 = 103
+    _field104 = 104
+    _field105 = 105
+    _field106 = 106
+    _field107 = 107
+    _field108 = 108
+    _field109 = 109
+    _field110 = 110
+    _field111 = 111
+    _field112 = 112
+    _field113 = 113
+    _field114 = 114
+    _field115 = 115
+    _field116 = 116
+    _field117 = 117
+    _field118 = 118
+    _field119 = 119
+    _field120 = 120
+    _field121 = 121
+    _field122 = 122
+    _field123 = 123
+    _field124 = 124
+    _field125 = 125
+    _field126 = 126
+    _field127 = 127
+    _field128 = 128
+  }
+
+  foo {
+    IO.print(_field1)
+    IO.print(_field128)
+  }
+}
+
+class Bar is Foo { // expect runtime error: A class may not have more than 255 fields, including inherited ones.
+  new {
+    super
+    _field129 = 129
+    _field130 = 130
+    _field131 = 131
+    _field132 = 132
+    _field133 = 133
+    _field134 = 134
+    _field135 = 135
+    _field136 = 136
+    _field137 = 137
+    _field138 = 138
+    _field139 = 139
+    _field140 = 140
+    _field141 = 141
+    _field142 = 142
+    _field143 = 143
+    _field144 = 144
+    _field145 = 145
+    _field146 = 146
+    _field147 = 147
+    _field148 = 148
+    _field149 = 149
+    _field150 = 150
+    _field151 = 151
+    _field152 = 152
+    _field153 = 153
+    _field154 = 154
+    _field155 = 155
+    _field156 = 156
+    _field157 = 157
+    _field158 = 158
+    _field159 = 159
+    _field160 = 160
+    _field161 = 161
+    _field162 = 162
+    _field163 = 163
+    _field164 = 164
+    _field165 = 165
+    _field166 = 166
+    _field167 = 167
+    _field168 = 168
+    _field169 = 169
+    _field170 = 170
+    _field171 = 171
+    _field172 = 172
+    _field173 = 173
+    _field174 = 174
+    _field175 = 175
+    _field176 = 176
+    _field177 = 177
+    _field178 = 178
+    _field179 = 179
+    _field180 = 180
+    _field181 = 181
+    _field182 = 182
+    _field183 = 183
+    _field184 = 184
+    _field185 = 185
+    _field186 = 186
+    _field187 = 187
+    _field188 = 188
+    _field189 = 189
+    _field190 = 190
+    _field191 = 191
+    _field192 = 192
+    _field193 = 193
+    _field194 = 194
+    _field195 = 195
+    _field196 = 196
+    _field197 = 197
+    _field198 = 198
+    _field199 = 199
+    _field200 = 200
+    _field201 = 201
+    _field202 = 202
+    _field203 = 203
+    _field204 = 204
+    _field205 = 205
+    _field206 = 206
+    _field207 = 207
+    _field208 = 208
+    _field209 = 209
+    _field210 = 210
+    _field211 = 211
+    _field212 = 212
+    _field213 = 213
+    _field214 = 214
+    _field215 = 215
+    _field216 = 216
+    _field217 = 217
+    _field218 = 218
+    _field219 = 219
+    _field220 = 220
+    _field221 = 221
+    _field222 = 222
+    _field223 = 223
+    _field224 = 224
+    _field225 = 225
+    _field226 = 226
+    _field227 = 227
+    _field228 = 228
+    _field229 = 229
+    _field230 = 230
+    _field231 = 231
+    _field232 = 232
+    _field233 = 233
+    _field234 = 234
+    _field235 = 235
+    _field236 = 236
+    _field237 = 237
+    _field238 = 238
+    _field239 = 239
+    _field240 = 240
+    _field241 = 241
+    _field242 = 242
+    _field243 = 243
+    _field244 = 244
+    _field245 = 245
+    _field246 = 246
+    _field247 = 247
+    _field248 = 248
+    _field249 = 249
+    _field250 = 250
+    _field251 = 251
+    _field252 = 252
+    _field253 = 253
+    _field254 = 254
+    _field255 = 255
+    _field256 = 256
+  }
+
+  bar {
+    IO.print(_field129)
+    IO.print(_field256)
+  }
+}
+
+var bar = new Bar
+bar.foo
+bar.bar
diff --git a/test/limit/too_many_fields.wren b/test/limit/too_many_fields.wren
new file mode 100644
index 00000000..f60e9fe1
--- /dev/null
+++ b/test/limit/too_many_fields.wren
@@ -0,0 +1,262 @@
+class Foo {
+  new {
+    _field1 = 1
+    _field2 = 2
+    _field3 = 3
+    _field4 = 4
+    _field5 = 5
+    _field6 = 6
+    _field7 = 7
+    _field8 = 8
+    _field9 = 9
+    _field10 = 10
+    _field11 = 11
+    _field12 = 12
+    _field13 = 13
+    _field14 = 14
+    _field15 = 15
+    _field16 = 16
+    _field17 = 17
+    _field18 = 18
+    _field19 = 19
+    _field20 = 20
+    _field21 = 21
+    _field22 = 22
+    _field23 = 23
+    _field24 = 24
+    _field25 = 25
+    _field26 = 26
+    _field27 = 27
+    _field28 = 28
+    _field29 = 29
+    _field30 = 30
+    _field31 = 31
+    _field32 = 32
+    _field33 = 33
+    _field34 = 34
+    _field35 = 35
+    _field36 = 36
+    _field37 = 37
+    _field38 = 38
+    _field39 = 39
+    _field40 = 40
+    _field41 = 41
+    _field42 = 42
+    _field43 = 43
+    _field44 = 44
+    _field45 = 45
+    _field46 = 46
+    _field47 = 47
+    _field48 = 48
+    _field49 = 49
+    _field50 = 50
+    _field51 = 51
+    _field52 = 52
+    _field53 = 53
+    _field54 = 54
+    _field55 = 55
+    _field56 = 56
+    _field57 = 57
+    _field58 = 58
+    _field59 = 59
+    _field60 = 60
+    _field61 = 61
+    _field62 = 62
+    _field63 = 63
+    _field64 = 64
+    _field65 = 65
+    _field66 = 66
+    _field67 = 67
+    _field68 = 68
+    _field69 = 69
+    _field70 = 70
+    _field71 = 71
+    _field72 = 72
+    _field73 = 73
+    _field74 = 74
+    _field75 = 75
+    _field76 = 76
+    _field77 = 77
+    _field78 = 78
+    _field79 = 79
+    _field80 = 80
+    _field81 = 81
+    _field82 = 82
+    _field83 = 83
+    _field84 = 84
+    _field85 = 85
+    _field86 = 86
+    _field87 = 87
+    _field88 = 88
+    _field89 = 89
+    _field90 = 90
+    _field91 = 91
+    _field92 = 92
+    _field93 = 93
+    _field94 = 94
+    _field95 = 95
+    _field96 = 96
+    _field97 = 97
+    _field98 = 98
+    _field99 = 99
+    _field100 = 100
+    _field101 = 101
+    _field102 = 102
+    _field103 = 103
+    _field104 = 104
+    _field105 = 105
+    _field106 = 106
+    _field107 = 107
+    _field108 = 108
+    _field109 = 109
+    _field110 = 110
+    _field111 = 111
+    _field112 = 112
+    _field113 = 113
+    _field114 = 114
+    _field115 = 115
+    _field116 = 116
+    _field117 = 117
+    _field118 = 118
+    _field119 = 119
+    _field120 = 120
+    _field121 = 121
+    _field122 = 122
+    _field123 = 123
+    _field124 = 124
+    _field125 = 125
+    _field126 = 126
+    _field127 = 127
+    _field128 = 128
+    _field129 = 129
+    _field130 = 130
+    _field131 = 131
+    _field132 = 132
+    _field133 = 133
+    _field134 = 134
+    _field135 = 135
+    _field136 = 136
+    _field137 = 137
+    _field138 = 138
+    _field139 = 139
+    _field140 = 140
+    _field141 = 141
+    _field142 = 142
+    _field143 = 143
+    _field144 = 144
+    _field145 = 145
+    _field146 = 146
+    _field147 = 147
+    _field148 = 148
+    _field149 = 149
+    _field150 = 150
+    _field151 = 151
+    _field152 = 152
+    _field153 = 153
+    _field154 = 154
+    _field155 = 155
+    _field156 = 156
+    _field157 = 157
+    _field158 = 158
+    _field159 = 159
+    _field160 = 160
+    _field161 = 161
+    _field162 = 162
+    _field163 = 163
+    _field164 = 164
+    _field165 = 165
+    _field166 = 166
+    _field167 = 167
+    _field168 = 168
+    _field169 = 169
+    _field170 = 170
+    _field171 = 171
+    _field172 = 172
+    _field173 = 173
+    _field174 = 174
+    _field175 = 175
+    _field176 = 176
+    _field177 = 177
+    _field178 = 178
+    _field179 = 179
+    _field180 = 180
+    _field181 = 181
+    _field182 = 182
+    _field183 = 183
+    _field184 = 184
+    _field185 = 185
+    _field186 = 186
+    _field187 = 187
+    _field188 = 188
+    _field189 = 189
+    _field190 = 190
+    _field191 = 191
+    _field192 = 192
+    _field193 = 193
+    _field194 = 194
+    _field195 = 195
+    _field196 = 196
+    _field197 = 197
+    _field198 = 198
+    _field199 = 199
+    _field200 = 200
+    _field201 = 201
+    _field202 = 202
+    _field203 = 203
+    _field204 = 204
+    _field205 = 205
+    _field206 = 206
+    _field207 = 207
+    _field208 = 208
+    _field209 = 209
+    _field210 = 210
+    _field211 = 211
+    _field212 = 212
+    _field213 = 213
+    _field214 = 214
+    _field215 = 215
+    _field216 = 216
+    _field217 = 217
+    _field218 = 218
+    _field219 = 219
+    _field220 = 220
+    _field221 = 221
+    _field222 = 222
+    _field223 = 223
+    _field224 = 224
+    _field225 = 225
+    _field226 = 226
+    _field227 = 227
+    _field228 = 228
+    _field229 = 229
+    _field230 = 230
+    _field231 = 231
+    _field232 = 232
+    _field233 = 233
+    _field234 = 234
+    _field235 = 235
+    _field236 = 236
+    _field237 = 237
+    _field238 = 238
+    _field239 = 239
+    _field240 = 240
+    _field241 = 241
+    _field242 = 242
+    _field243 = 243
+    _field244 = 244
+    _field245 = 245
+    _field246 = 246
+    _field247 = 247
+    _field248 = 248
+    _field249 = 249
+    _field250 = 250
+    _field251 = 251
+    _field252 = 252
+    _field253 = 253
+    _field254 = 254
+    _field255 = 255
+    _field256 = 256 // expect error
+  }
+}
+
+var foo = new Foo
diff --git a/test/limit/too_many_inherited_fields.wren b/test/limit/too_many_inherited_fields.wren
new file mode 100644
index 00000000..97be268a
--- /dev/null
+++ b/test/limit/too_many_inherited_fields.wren
@@ -0,0 +1,281 @@
+class Foo {
+  new {
+    _field1 = 1
+    _field2 = 2
+    _field3 = 3
+    _field4 = 4
+    _field5 = 5
+    _field6 = 6
+    _field7 = 7
+    _field8 = 8
+    _field9 = 9
+    _field10 = 10
+    _field11 = 11
+    _field12 = 12
+    _field13 = 13
+    _field14 = 14
+    _field15 = 15
+    _field16 = 16
+    _field17 = 17
+    _field18 = 18
+    _field19 = 19
+    _field20 = 20
+    _field21 = 21
+    _field22 = 22
+    _field23 = 23
+    _field24 = 24
+    _field25 = 25
+    _field26 = 26
+    _field27 = 27
+    _field28 = 28
+    _field29 = 29
+    _field30 = 30
+    _field31 = 31
+    _field32 = 32
+    _field33 = 33
+    _field34 = 34
+    _field35 = 35
+    _field36 = 36
+    _field37 = 37
+    _field38 = 38
+    _field39 = 39
+    _field40 = 40
+    _field41 = 41
+    _field42 = 42
+    _field43 = 43
+    _field44 = 44
+    _field45 = 45
+    _field46 = 46
+    _field47 = 47
+    _field48 = 48
+    _field49 = 49
+    _field50 = 50
+    _field51 = 51
+    _field52 = 52
+    _field53 = 53
+    _field54 = 54
+    _field55 = 55
+    _field56 = 56
+    _field57 = 57
+    _field58 = 58
+    _field59 = 59
+    _field60 = 60
+    _field61 = 61
+    _field62 = 62
+    _field63 = 63
+    _field64 = 64
+    _field65 = 65
+    _field66 = 66
+    _field67 = 67
+    _field68 = 68
+    _field69 = 69
+    _field70 = 70
+    _field71 = 71
+    _field72 = 72
+    _field73 = 73
+    _field74 = 74
+    _field75 = 75
+    _field76 = 76
+    _field77 = 77
+    _field78 = 78
+    _field79 = 79
+    _field80 = 80
+    _field81 = 81
+    _field82 = 82
+    _field83 = 83
+    _field84 = 84
+    _field85 = 85
+    _field86 = 86
+    _field87 = 87
+    _field88 = 88
+    _field89 = 89
+    _field90 = 90
+    _field91 = 91
+    _field92 = 92
+    _field93 = 93
+    _field94 = 94
+    _field95 = 95
+    _field96 = 96
+    _field97 = 97
+    _field98 = 98
+    _field99 = 99
+    _field100 = 100
+    _field101 = 101
+    _field102 = 102
+    _field103 = 103
+    _field104 = 104
+    _field105 = 105
+    _field106 = 106
+    _field107 = 107
+    _field108 = 108
+    _field109 = 109
+    _field110 = 110
+    _field111 = 111
+    _field112 = 112
+    _field113 = 113
+    _field114 = 114
+    _field115 = 115
+    _field116 = 116
+    _field117 = 117
+    _field118 = 118
+    _field119 = 119
+    _field120 = 120
+    _field121 = 121
+    _field122 = 122
+    _field123 = 123
+    _field124 = 124
+    _field125 = 125
+    _field126 = 126
+    _field127 = 127
+    _field128 = 128
+  }
+
+  foo {
+    IO.print(_field1)
+    IO.print(_field128)
+  }
+}
+
+class Bar is Foo {
+  new {
+    super
+    _field129 = 129
+    _field130 = 130
+    _field131 = 131
+    _field132 = 132
+    _field133 = 133
+    _field134 = 134
+    _field135 = 135
+    _field136 = 136
+    _field137 = 137
+    _field138 = 138
+    _field139 = 139
+    _field140 = 140
+    _field141 = 141
+    _field142 = 142
+    _field143 = 143
+    _field144 = 144
+    _field145 = 145
+    _field146 = 146
+    _field147 = 147
+    _field148 = 148
+    _field149 = 149
+    _field150 = 150
+    _field151 = 151
+    _field152 = 152
+    _field153 = 153
+    _field154 = 154
+    _field155 = 155
+    _field156 = 156
+    _field157 = 157
+    _field158 = 158
+    _field159 = 159
+    _field160 = 160
+    _field161 = 161
+    _field162 = 162
+    _field163 = 163
+    _field164 = 164
+    _field165 = 165
+    _field166 = 166
+    _field167 = 167
+    _field168 = 168
+    _field169 = 169
+    _field170 = 170
+    _field171 = 171
+    _field172 = 172
+    _field173 = 173
+    _field174 = 174
+    _field175 = 175
+    _field176 = 176
+    _field177 = 177
+    _field178 = 178
+    _field179 = 179
+    _field180 = 180
+    _field181 = 181
+    _field182 = 182
+    _field183 = 183
+    _field184 = 184
+    _field185 = 185
+    _field186 = 186
+    _field187 = 187
+    _field188 = 188
+    _field189 = 189
+    _field190 = 190
+    _field191 = 191
+    _field192 = 192
+    _field193 = 193
+    _field194 = 194
+    _field195 = 195
+    _field196 = 196
+    _field197 = 197
+    _field198 = 198
+    _field199 = 199
+    _field200 = 200
+    _field201 = 201
+    _field202 = 202
+    _field203 = 203
+    _field204 = 204
+    _field205 = 205
+    _field206 = 206
+    _field207 = 207
+    _field208 = 208
+    _field209 = 209
+    _field210 = 210
+    _field211 = 211
+    _field212 = 212
+    _field213 = 213
+    _field214 = 214
+    _field215 = 215
+    _field216 = 216
+    _field217 = 217
+    _field218 = 218
+    _field219 = 219
+    _field220 = 220
+    _field221 = 221
+    _field222 = 222
+    _field223 = 223
+    _field224 = 224
+    _field225 = 225
+    _field226 = 226
+    _field227 = 227
+    _field228 = 228
+    _field229 = 229
+    _field230 = 230
+    _field231 = 231
+    _field232 = 232
+    _field233 = 233
+    _field234 = 234
+    _field235 = 235
+    _field236 = 236
+    _field237 = 237
+    _field238 = 238
+    _field239 = 239
+    _field240 = 240
+    _field241 = 241
+    _field242 = 242
+    _field243 = 243
+    _field244 = 244
+    _field245 = 245
+    _field246 = 246
+    _field247 = 247
+    _field248 = 248
+    _field249 = 249
+    _field250 = 250
+    _field251 = 251
+    _field252 = 252
+    _field253 = 253
+    _field254 = 254
+    _field255 = 255
+  }
+
+  bar {
+    IO.print(_field129)
+    IO.print(_field255)
+  }
+}
+
+var bar = new Bar
+bar.foo // expect: 1
+// expect: 128
+bar.bar // expect: 129
+// expect: 255