Updated this file to match reality.

Thanks Shane for pointing this out!

Lib/symbol.py

@@ -30,50 +30,51 @@ flow_stmt = 272
 break_stmt = 273
 continue_stmt = 274
 return_stmt = 275
-raise_stmt = 276
-import_stmt = 277
-import_as_name = 278
-dotted_as_name = 279
-dotted_name = 280
-global_stmt = 281
-exec_stmt = 282
-assert_stmt = 283
-compound_stmt = 284
-if_stmt = 285
-while_stmt = 286
-for_stmt = 287
-try_stmt = 288
-except_clause = 289
-suite = 290
-test = 291
-and_test = 292
-not_test = 293
-comparison = 294
-comp_op = 295
-expr = 296
-xor_expr = 297
-and_expr = 298
-shift_expr = 299
-arith_expr = 300
-term = 301
-factor = 302
-power = 303
-atom = 304
-listmaker = 305
-lambdef = 306
-trailer = 307
-subscriptlist = 308
-subscript = 309
-sliceop = 310
-exprlist = 311
-testlist = 312
-dictmaker = 313
-classdef = 314
-arglist = 315
-argument = 316
-list_iter = 317
-list_for = 318
-list_if = 319
+yield_stmt = 276
+raise_stmt = 277
+import_stmt = 278
+import_as_name = 279
+dotted_as_name = 280
+dotted_name = 281
+global_stmt = 282
+exec_stmt = 283
+assert_stmt = 284
+compound_stmt = 285
+if_stmt = 286
+while_stmt = 287
+for_stmt = 288
+try_stmt = 289
+except_clause = 290
+suite = 291
+test = 292
+and_test = 293
+not_test = 294
+comparison = 295
+comp_op = 296
+expr = 297
+xor_expr = 298
+and_expr = 299
+shift_expr = 300
+arith_expr = 301
+term = 302
+factor = 303
+power = 304
+atom = 305
+listmaker = 306
+lambdef = 307
+trailer = 308
+subscriptlist = 309
+subscript = 310
+sliceop = 311
+exprlist = 312
+testlist = 313
+dictmaker = 314
+classdef = 315
+arglist = 316
+argument = 317
+list_iter = 318
+list_for = 319
+list_if = 320
 #--end constants--
 
 sym_name = {}