Added NOPE keyword with break functionality that prints at the start

Author: nweinb

Grammar/Grammar

@@ -91,7 +91,7 @@ augassign: ('+=' | '-=' | '*=' | '@=' | '/=' | '%=' | '&=' | '|=' | '^=' |
 # For normal and annotated assignments, additional restrictions enforced by the interpreter
 del_stmt: 'del' exprlist
 pass_stmt: 'pass'
-flow_stmt: break_stmt | continue_stmt | return_stmt | raise_stmt | yield_stmt | almog_stmt
+flow_stmt: break_stmt | continue_stmt | return_stmt | raise_stmt | yield_stmt | almog_stmt | nope_stmt
 break_stmt: 'break'
 continue_stmt: 'continue'
 return_stmt: 'return' [testlist_star_expr]
@@ -100,6 +100,7 @@ raise_stmt: 'raise' [test ['from' test]]
 import_stmt: import_name | import_from
 import_name: 'import' dotted_as_names
 almog_stmt: 'almog'
+nope_stmt: 'nope'
 # note below: the ('.' | '...') is necessary because '...' is tokenized as ELLIPSIS
 import_from: ('from' (('.' | '...')* dotted_name | ('.' | '...')+)
               'import' ('*' | '(' import_as_names ')' | import_as_names))

Include/Python-ast.h

@@ -42,6 +42,7 @@
     'is',
     'lambda',
     'nonlocal',
+    'nope',
     'not',
     'or',
     'pass',

Include/graminit.h

@@ -43,68 +43,69 @@
 import_stmt = 284
 import_name = 285
 almog_stmt = 286
-import_from = 287
-import_as_name = 288
-dotted_as_name = 289
-import_as_names = 290
-dotted_as_names = 291
-dotted_name = 292
-global_stmt = 293
-nonlocal_stmt = 294
-assert_stmt = 295
-compound_stmt = 296
-async_stmt = 297
-if_stmt = 298
-while_stmt = 299
-for_stmt = 300
-try_stmt = 301
-with_stmt = 302
-with_item = 303
-except_clause = 304
-suite = 305
-namedexpr_test = 306
-test = 307
-test_nocond = 308
-lambdef = 309
-lambdef_nocond = 310
-or_test = 311
-and_test = 312
-not_test = 313
-comparison = 314
-comp_op = 315
-star_expr = 316
-expr = 317
-xor_expr = 318
-and_expr = 319
-shift_expr = 320
-arith_expr = 321
-term = 322
-factor = 323
-power = 324
-atom_expr = 325
-atom = 326
-testlist_comp = 327
-trailer = 328
-subscriptlist = 329
-subscript = 330
-sliceop = 331
-exprlist = 332
-testlist = 333
-dictorsetmaker = 334
-classdef = 335
-arglist = 336
-argument = 337
-comp_iter = 338
-sync_comp_for = 339
-comp_for = 340
-comp_if = 341
-encoding_decl = 342
-yield_expr = 343
-yield_arg = 344
-func_body_suite = 345
-func_type_input = 346
-func_type = 347
-typelist = 348
+nope_stmt = 287
+import_from = 288
+import_as_name = 289
+dotted_as_name = 290
+import_as_names = 291
+dotted_as_names = 292
+dotted_name = 293
+global_stmt = 294
+nonlocal_stmt = 295
+assert_stmt = 296
+compound_stmt = 297
+async_stmt = 298
+if_stmt = 299
+while_stmt = 300
+for_stmt = 301
+try_stmt = 302
+with_stmt = 303
+with_item = 304
+except_clause = 305
+suite = 306
+namedexpr_test = 307
+test = 308
+test_nocond = 309
+lambdef = 310
+lambdef_nocond = 311
+or_test = 312
+and_test = 313
+not_test = 314
+comparison = 315
+comp_op = 316
+star_expr = 317
+expr = 318
+xor_expr = 319
+and_expr = 320
+shift_expr = 321
+arith_expr = 322
+term = 323
+factor = 324
+power = 325
+atom_expr = 326
+atom = 327
+testlist_comp = 328
+trailer = 329
+subscriptlist = 330
+subscript = 331
+sliceop = 332
+exprlist = 333
+testlist = 334
+dictorsetmaker = 335
+classdef = 336
+arglist = 337
+argument = 338
+comp_iter = 339
+sync_comp_for = 340
+comp_for = 341
+comp_if = 342
+encoding_decl = 343
+yield_expr = 344
+yield_arg = 345
+func_body_suite = 346
+func_type_input = 347
+func_type = 348
+typelist = 349
 #--end constants--
 
 sym_name = {}

Lib/keyword.py

@@ -49,7 +49,7 @@ module Python
           | Global(identifier* names)
           | Nonlocal(identifier* names)
           | Expr(expr value)
-          | Pass | Break | Continue | Almog
+          | Pass | Break | Continue | Almog | Nope
 
           -- XXX Jython will be different
           -- col_offset is the byte offset in the utf8 string the parser uses

Lib/symbol.py

@@ -3553,6 +3553,9 @@ ast_for_flow_stmt(struct compiling *c, const node *n)
         case almog_stmt:
             return Almog(LINENO(n), n->n_col_offset,
                             n->n_end_lineno, n->n_end_col_offset, c->c_arena);
+        case nope_stmt:
+            return Nope(LINENO(n), n->n_col_offset,
+                            n->n_end_lineno, n->n_end_col_offset, c->c_arena);
         case yield_stmt: { /* will reduce to yield_expr */
             expr_ty exp = ast_for_expr(c, CHILD(ch, 0));
             if (!exp)