From e3944a5e1ecf67aa722fd9ce0c0a4ee72ee5ba2d Mon Sep 17 00:00:00 2001
From: Brett Cannon <bcannon@gmail.com>
Date: Wed, 1 Apr 2009 05:08:41 +0000
Subject: [PATCH] The BDFL has retired! Long live the FLUFL (Friendly Language
 Uncle For Life)!

---
 Grammar/Grammar        |   2 +-
 Include/code.h         |   4 +-
 Include/compile.h      |   1 +
 Include/parsetok.h     |   1 +
 Include/pythonrun.h    |   2 +-
 Lib/__future__.py      |   5 ++
 Lib/test/test_flufl.py |  27 ++++++
 Parser/parser.c        |   8 ++
 Parser/parsetok.c      |  38 ++++----
 Parser/tokenizer.c     |   1 +
 Python/future.c        |   2 +
 Python/graminit.c      | 196 +++++++++++++++++++++--------------------
 Python/pythonrun.c     |   2 +
 13 files changed, 168 insertions(+), 121 deletions(-)
 create mode 100644 Lib/test/test_flufl.py

diff --git a/Grammar/Grammar b/Grammar/Grammar
index 64816d9b2ce..e9922c1162a 100644
--- a/Grammar/Grammar
+++ b/Grammar/Grammar
@@ -87,7 +87,7 @@ or_test: and_test ('or' and_test)*
 and_test: not_test ('and' not_test)*
 not_test: 'not' not_test | comparison
 comparison: star_expr (comp_op star_expr)*
-comp_op: '<'|'>'|'=='|'>='|'<='|'!='|'in'|'not' 'in'|'is'|'is' 'not'
+comp_op: '<'|'>'|'=='|'>='|'<='|'<>'|'!='|'in'|'not' 'in'|'is'|'is' 'not'
 star_expr: ['*'] expr
 expr: xor_expr ('|' xor_expr)*
 xor_expr: and_expr ('^' and_expr)*
diff --git a/Include/code.h b/Include/code.h
index d738d8dd835..145a9a128b9 100644
--- a/Include/code.h
+++ b/Include/code.h
@@ -52,10 +52,12 @@ typedef struct {
 #define CO_FUTURE_UNICODE_LITERALS 0x20000
 #endif
 
+#define CO_FUTURE_BARRY_AS_BDFL  0x40000
+
 /* This should be defined if a future statement modifies the syntax.
    For example, when a keyword is added.
 */
-/* #define PY_PARSER_REQUIRES_FUTURE_KEYWORD */
+#define PY_PARSER_REQUIRES_FUTURE_KEYWORD
 
 #define CO_MAXBLOCKS 20 /* Max static block nesting within a function */
 
diff --git a/Include/compile.h b/Include/compile.h
index d78f8249ec0..7c329b3e6db 100644
--- a/Include/compile.h
+++ b/Include/compile.h
@@ -26,6 +26,7 @@ typedef struct {
 #define FUTURE_WITH_STATEMENT "with_statement"
 #define FUTURE_PRINT_FUNCTION "print_function"
 #define FUTURE_UNICODE_LITERALS "unicode_literals"
+#define FUTURE_BARRY_AS_BDFL "barry_as_FLUFL"
 
 struct _mod; /* Declare the existence of this type */
 PyAPI_FUNC(PyCodeObject *) PyAST_Compile(struct _mod *, const char *,
diff --git a/Include/parsetok.h b/Include/parsetok.h
index fa402f862a0..af805705db8 100644
--- a/Include/parsetok.h
+++ b/Include/parsetok.h
@@ -30,6 +30,7 @@ typedef struct {
 #endif
 
 #define PyPARSE_IGNORE_COOKIE 0x0010
+#define PyPARSE_BARRY_AS_BDFL 0x0020
 
 PyAPI_FUNC(node *) PyParser_ParseString(const char *, grammar *, int,
                                               perrdetail *);
diff --git a/Include/pythonrun.h b/Include/pythonrun.h
index c909e1a87ad..86d9fe2250c 100644
--- a/Include/pythonrun.h
+++ b/Include/pythonrun.h
@@ -7,7 +7,7 @@
 extern "C" {
 #endif
 
-#define PyCF_MASK 0
+#define PyCF_MASK CO_FUTURE_BARRY_AS_BDFL
 #define PyCF_MASK_OBSOLETE 0
 #define PyCF_SOURCE_IS_UTF8  0x0100
 #define PyCF_DONT_IMPLY_DEDENT 0x0200
diff --git a/Lib/__future__.py b/Lib/__future__.py
index 915645933c0..5ff282f73c4 100644
--- a/Lib/__future__.py
+++ b/Lib/__future__.py
@@ -70,6 +70,7 @@ CO_FUTURE_ABSOLUTE_IMPORT = 0x4000 # perform absolute imports by default
 CO_FUTURE_WITH_STATEMENT  = 0x8000   # with statement
 CO_FUTURE_PRINT_FUNCTION  = 0x10000   # print function
 CO_FUTURE_UNICODE_LITERALS = 0x20000 # unicode string literals
+CO_FUTURE_BARRY_AS_BDFL = 0x40000
 
 class _Feature:
     def __init__(self, optionalRelease, mandatoryRelease, compiler_flag):
@@ -126,3 +127,7 @@ print_function = _Feature((2, 6, 0, "alpha", 2),
 unicode_literals = _Feature((2, 6, 0, "alpha", 2),
                             (3, 0, 0, "alpha", 0),
                             CO_FUTURE_UNICODE_LITERALS)
+
+barry_as_FLUFL = _Feature((3, 1, 0, "alpha", 2),
+                         (3, 9, 0, "alpha", 0),
+                         CO_FUTURE_BARRY_AS_BDFL)
diff --git a/Lib/test/test_flufl.py b/Lib/test/test_flufl.py
new file mode 100644
index 00000000000..5a709bc5f5d
--- /dev/null
+++ b/Lib/test/test_flufl.py
@@ -0,0 +1,27 @@
+import __future__
+import unittest
+
+class FLUFLTests(unittest.TestCase):
+
+    def test_barry_as_bdfl(self):
+        code = "from __future__ import barry_as_FLUFL; 2 {0} 3"
+        compile(code.format('<>'), '<BDFL test>', 'exec',
+                __future__.CO_FUTURE_BARRY_AS_BDFL)
+        self.assertRaises(SyntaxError, compile, code.format('!='),
+                            '<FLUFL test>', 'exec',
+                            __future__.CO_FUTURE_BARRY_AS_BDFL)
+
+    def test_guido_as_bdfl(self):
+        code = '2 {0} 3'
+        compile(code.format('!='), '<BDFL test>', 'exec')
+        self.assertRaises(SyntaxError, compile, code.format('<>'),
+                            '<FLUFL test>', 'exec')
+
+
+def test_main():
+    from test.support import run_unittest
+    run_unittest(FLUFLTests)
+
+
+if __name__ == '__main__':
+    test_main()
diff --git a/Parser/parser.c b/Parser/parser.c
index ff4ce1691b6..83e5e6d0f82 100644
--- a/Parser/parser.c
+++ b/Parser/parser.c
@@ -149,6 +149,7 @@ classify(parser_state *ps, int type, char *str)
 			    strcmp(l->lb_str, s) != 0)
 				continue;
 #ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
+#if 0
                         /* Leaving this in as an example */
 			if (!(ps->p_flags & CO_FUTURE_WITH_STATEMENT)) {
 				if (s[0] == 'w' && strcmp(s, "with") == 0)
@@ -156,6 +157,7 @@ classify(parser_state *ps, int type, char *str)
 				else if (s[0] == 'a' && strcmp(s, "as") == 0)
 					break; /* not a keyword yet */
 			}
+#endif
 #endif
 			D(printf("It's a keyword\n"));
 			return n - i;
@@ -178,6 +180,7 @@ classify(parser_state *ps, int type, char *str)
 }
 
 #ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
+#if 0
 /* Leaving this in as an example */
 static void
 future_hack(parser_state *ps)
@@ -218,6 +221,7 @@ future_hack(parser_state *ps)
 		}
 	}
 }
+#endif
 #endif /* future keyword */
 
 int
@@ -278,10 +282,12 @@ PyParser_AddToken(register parser_state *ps, register int type, char *str,
 						 d->d_name,
 						 ps->p_stack.s_top->s_state));
 #ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
+#if 0
 					if (d->d_name[0] == 'i' &&
 					    strcmp(d->d_name,
 						   "import_stmt") == 0)
 						future_hack(ps);
+#endif
 #endif
 					s_pop(&ps->p_stack);
 					if (s_empty(&ps->p_stack)) {
@@ -296,9 +302,11 @@ PyParser_AddToken(register parser_state *ps, register int type, char *str,
 		
 		if (s->s_accept) {
 #ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
+#if 0
 			if (d->d_name[0] == 'i' &&
 			    strcmp(d->d_name, "import_stmt") == 0)
 				future_hack(ps);
+#endif
 #endif
 			/* Pop this dfa and try again */
 			s_pop(&ps->p_stack);
diff --git a/Parser/parsetok.c b/Parser/parsetok.c
index 4c3b5065e33..14703273c95 100644
--- a/Parser/parsetok.c
+++ b/Parser/parsetok.c
@@ -100,6 +100,7 @@ PyParser_ParseFileFlagsEx(FILE *fp, const char *filename,
 }
 
 #ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
+#if 0
 static char with_msg[] =
 "%s:%d: Warning: 'with' will become a reserved keyword in Python 2.6\n";
 
@@ -114,6 +115,7 @@ warn(const char *msg, const char *filename, int lineno)
 	PySys_WriteStderr(msg, filename, lineno);
 }
 #endif
+#endif
 
 /* Parse input coming from the given tokenizer structure.
    Return error code. */
@@ -133,8 +135,8 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
 		return NULL;
 	}
 #ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
-	if (*flags & PyPARSE_WITH_IS_KEYWORD)
-		ps->p_flags |= CO_FUTURE_WITH_STATEMENT;
+	if (*flags & PyPARSE_BARRY_AS_BDFL)
+		ps->p_flags |= CO_FUTURE_BARRY_AS_BDFL;
 #endif
 
 	for (;;) {
@@ -177,26 +179,20 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
 		str[len] = '\0';
 
 #ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
-		/* This is only necessary to support the "as" warning, but
-		   we don't want to warn about "as" in import statements. */
-		if (type == NAME &&
-		    len == 6 && str[0] == 'i' && strcmp(str, "import") == 0)
-			handling_import = 1;
-
-		/* Warn about with as NAME */
-		if (type == NAME &&
-		    !(ps->p_flags & CO_FUTURE_WITH_STATEMENT)) {
-		    if (len == 4 && str[0] == 'w' && strcmp(str, "with") == 0)
-			warn(with_msg, err_ret->filename, tok->lineno);
-		    else if (!(handling_import || handling_with) &&
-		             len == 2 && str[0] == 'a' &&
-			     strcmp(str, "as") == 0)
-			warn(as_msg, err_ret->filename, tok->lineno);
+		if (type == NOTEQUAL) {
+			if (!(ps->p_flags & CO_FUTURE_BARRY_AS_BDFL) &&
+					strcmp(str, "!=")) {
+				err_ret->error = E_SYNTAX;
+				break;
+			}
+			else if ((ps->p_flags & CO_FUTURE_BARRY_AS_BDFL) &&
+					strcmp(str, "<>")) {
+				err_ret->text = "with Barry as BDFL, use '<>' "
+						"instead of '!='";
+				err_ret->error = E_SYNTAX;
+				break;
+			}
 		}
-		else if (type == NAME &&
-			 (ps->p_flags & CO_FUTURE_WITH_STATEMENT) &&
-			 len == 4 && str[0] == 'w' && strcmp(str, "with") == 0)
-			handling_with = 1;
 #endif
 		if (a >= tok->line_start)
 			col_offset = a - tok->line_start;
diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index c4f447d2eed..15e8185f8f6 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -1040,6 +1040,7 @@ PyToken_TwoChars(int c1, int c2)
 		break;
 	case '<':
 		switch (c2) {
+		case '>':	return NOTEQUAL;
 		case '=':	return LESSEQUAL;
 		case '<':	return LEFTSHIFT;
 		}
diff --git a/Python/future.c b/Python/future.c
index 1a2db1b8437..4178541585b 100644
--- a/Python/future.c
+++ b/Python/future.c
@@ -39,6 +39,8 @@ future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
 			continue;
 		} else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {
 			continue;
+		} else if (strcmp(feature, FUTURE_BARRY_AS_BDFL) == 0) {
+			ff->ff_features |= CO_FUTURE_BARRY_AS_BDFL;
 		} else if (strcmp(feature, "braces") == 0) {
 			PyErr_SetString(PyExc_SyntaxError,
 					"not a chance");
diff --git a/Python/graminit.c b/Python/graminit.c
index c503a322a40..4c159bc455c 100644
--- a/Python/graminit.c
+++ b/Python/graminit.c
@@ -1129,16 +1129,17 @@ static state states_52[2] = {
 	{1, arcs_52_0},
 	{2, arcs_52_1},
 };
-static arc arcs_53_0[9] = {
+static arc arcs_53_0[10] = {
 	{118, 1},
 	{119, 1},
 	{120, 1},
 	{121, 1},
 	{122, 1},
 	{123, 1},
+	{124, 1},
 	{95, 1},
 	{114, 2},
-	{124, 3},
+	{125, 3},
 };
 static arc arcs_53_1[1] = {
 	{0, 1},
@@ -1151,7 +1152,7 @@ static arc arcs_53_3[2] = {
 	{0, 3},
 };
 static state states_53[4] = {
-	{9, arcs_53_0},
+	{10, arcs_53_0},
 	{1, arcs_53_1},
 	{1, arcs_53_2},
 	{2, arcs_53_3},
@@ -1172,10 +1173,10 @@ static state states_54[3] = {
 	{1, arcs_54_2},
 };
 static arc arcs_55_0[1] = {
-	{125, 1},
+	{126, 1},
 };
 static arc arcs_55_1[2] = {
-	{126, 0},
+	{127, 0},
 	{0, 1},
 };
 static state states_55[2] = {
@@ -1183,10 +1184,10 @@ static state states_55[2] = {
 	{2, arcs_55_1},
 };
 static arc arcs_56_0[1] = {
-	{127, 1},
+	{128, 1},
 };
 static arc arcs_56_1[2] = {
-	{128, 0},
+	{129, 0},
 	{0, 1},
 };
 static state states_56[2] = {
@@ -1194,10 +1195,10 @@ static state states_56[2] = {
 	{2, arcs_56_1},
 };
 static arc arcs_57_0[1] = {
-	{129, 1},
+	{130, 1},
 };
 static arc arcs_57_1[2] = {
-	{130, 0},
+	{131, 0},
 	{0, 1},
 };
 static state states_57[2] = {
@@ -1205,11 +1206,11 @@ static state states_57[2] = {
 	{2, arcs_57_1},
 };
 static arc arcs_58_0[1] = {
-	{131, 1},
+	{132, 1},
 };
 static arc arcs_58_1[3] = {
-	{132, 0},
 	{133, 0},
+	{134, 0},
 	{0, 1},
 };
 static state states_58[2] = {
@@ -1217,11 +1218,11 @@ static state states_58[2] = {
 	{3, arcs_58_1},
 };
 static arc arcs_59_0[1] = {
-	{134, 1},
+	{135, 1},
 };
 static arc arcs_59_1[3] = {
-	{135, 0},
 	{136, 0},
+	{137, 0},
 	{0, 1},
 };
 static state states_59[2] = {
@@ -1229,13 +1230,13 @@ static state states_59[2] = {
 	{3, arcs_59_1},
 };
 static arc arcs_60_0[1] = {
-	{137, 1},
+	{138, 1},
 };
 static arc arcs_60_1[5] = {
 	{31, 0},
-	{138, 0},
 	{139, 0},
 	{140, 0},
+	{141, 0},
 	{0, 1},
 };
 static state states_60[2] = {
@@ -1243,13 +1244,13 @@ static state states_60[2] = {
 	{5, arcs_60_1},
 };
 static arc arcs_61_0[4] = {
-	{135, 1},
 	{136, 1},
-	{141, 1},
-	{142, 2},
+	{137, 1},
+	{142, 1},
+	{143, 2},
 };
 static arc arcs_61_1[1] = {
-	{137, 2},
+	{138, 2},
 };
 static arc arcs_61_2[1] = {
 	{0, 2},
@@ -1260,15 +1261,15 @@ static state states_61[3] = {
 	{1, arcs_61_2},
 };
 static arc arcs_62_0[1] = {
-	{143, 1},
+	{144, 1},
 };
 static arc arcs_62_1[3] = {
-	{144, 1},
+	{145, 1},
 	{32, 2},
 	{0, 1},
 };
 static arc arcs_62_2[1] = {
-	{137, 3},
+	{138, 3},
 };
 static arc arcs_62_3[1] = {
 	{0, 3},
@@ -1281,44 +1282,44 @@ static state states_62[4] = {
 };
 static arc arcs_63_0[10] = {
 	{13, 1},
-	{146, 2},
-	{148, 3},
+	{147, 2},
+	{149, 3},
 	{21, 4},
-	{151, 4},
-	{152, 5},
+	{152, 4},
+	{153, 5},
 	{77, 4},
-	{153, 4},
 	{154, 4},
 	{155, 4},
+	{156, 4},
 };
 static arc arcs_63_1[3] = {
 	{46, 6},
-	{145, 6},
+	{146, 6},
 	{15, 4},
 };
 static arc arcs_63_2[2] = {
-	{145, 7},
-	{147, 4},
+	{146, 7},
+	{148, 4},
 };
 static arc arcs_63_3[2] = {
-	{149, 8},
-	{150, 4},
+	{150, 8},
+	{151, 4},
 };
 static arc arcs_63_4[1] = {
 	{0, 4},
 };
 static arc arcs_63_5[2] = {
-	{152, 5},
+	{153, 5},
 	{0, 5},
 };
 static arc arcs_63_6[1] = {
 	{15, 4},
 };
 static arc arcs_63_7[1] = {
-	{147, 4},
+	{148, 4},
 };
 static arc arcs_63_8[1] = {
-	{150, 4},
+	{151, 4},
 };
 static state states_63[9] = {
 	{10, arcs_63_0},
@@ -1335,7 +1336,7 @@ static arc arcs_64_0[1] = {
 	{24, 1},
 };
 static arc arcs_64_1[3] = {
-	{156, 2},
+	{157, 2},
 	{30, 3},
 	{0, 1},
 };
@@ -1359,7 +1360,7 @@ static state states_64[5] = {
 };
 static arc arcs_65_0[3] = {
 	{13, 1},
-	{146, 2},
+	{147, 2},
 	{76, 3},
 };
 static arc arcs_65_1[2] = {
@@ -1367,7 +1368,7 @@ static arc arcs_65_1[2] = {
 	{15, 5},
 };
 static arc arcs_65_2[1] = {
-	{157, 6},
+	{158, 6},
 };
 static arc arcs_65_3[1] = {
 	{21, 5},
@@ -1379,7 +1380,7 @@ static arc arcs_65_5[1] = {
 	{0, 5},
 };
 static arc arcs_65_6[1] = {
-	{147, 5},
+	{148, 5},
 };
 static state states_65[7] = {
 	{3, arcs_65_0},
@@ -1391,14 +1392,14 @@ static state states_65[7] = {
 	{1, arcs_65_6},
 };
 static arc arcs_66_0[1] = {
-	{158, 1},
+	{159, 1},
 };
 static arc arcs_66_1[2] = {
 	{30, 2},
 	{0, 1},
 };
 static arc arcs_66_2[2] = {
-	{158, 1},
+	{159, 1},
 	{0, 2},
 };
 static state states_66[3] = {
@@ -1416,11 +1417,11 @@ static arc arcs_67_1[2] = {
 };
 static arc arcs_67_2[3] = {
 	{24, 3},
-	{159, 4},
+	{160, 4},
 	{0, 2},
 };
 static arc arcs_67_3[2] = {
-	{159, 4},
+	{160, 4},
 	{0, 3},
 };
 static arc arcs_67_4[1] = {
@@ -1485,7 +1486,7 @@ static arc arcs_71_0[1] = {
 };
 static arc arcs_71_1[4] = {
 	{25, 2},
-	{156, 3},
+	{157, 3},
 	{30, 4},
 	{0, 1},
 };
@@ -1500,7 +1501,7 @@ static arc arcs_71_4[2] = {
 	{0, 4},
 };
 static arc arcs_71_5[3] = {
-	{156, 3},
+	{157, 3},
 	{30, 7},
 	{0, 5},
 };
@@ -1536,7 +1537,7 @@ static state states_71[11] = {
 	{2, arcs_71_10},
 };
 static arc arcs_72_0[1] = {
-	{160, 1},
+	{161, 1},
 };
 static arc arcs_72_1[1] = {
 	{21, 2},
@@ -1572,7 +1573,7 @@ static state states_72[8] = {
 	{1, arcs_72_7},
 };
 static arc arcs_73_0[3] = {
-	{161, 1},
+	{162, 1},
 	{31, 2},
 	{32, 3},
 };
@@ -1587,7 +1588,7 @@ static arc arcs_73_3[1] = {
 	{24, 6},
 };
 static arc arcs_73_4[4] = {
-	{161, 1},
+	{162, 1},
 	{31, 2},
 	{32, 3},
 	{0, 4},
@@ -1600,7 +1601,7 @@ static arc arcs_73_6[1] = {
 	{0, 6},
 };
 static arc arcs_73_7[2] = {
-	{161, 5},
+	{162, 5},
 	{32, 3},
 };
 static state states_73[8] = {
@@ -1617,7 +1618,7 @@ static arc arcs_74_0[1] = {
 	{24, 1},
 };
 static arc arcs_74_1[3] = {
-	{156, 2},
+	{157, 2},
 	{29, 3},
 	{0, 1},
 };
@@ -1634,8 +1635,8 @@ static state states_74[4] = {
 	{1, arcs_74_3},
 };
 static arc arcs_75_0[2] = {
-	{156, 1},
-	{163, 1},
+	{157, 1},
+	{164, 1},
 };
 static arc arcs_75_1[1] = {
 	{0, 1},
@@ -1657,7 +1658,7 @@ static arc arcs_76_3[1] = {
 	{105, 4},
 };
 static arc arcs_76_4[2] = {
-	{162, 5},
+	{163, 5},
 	{0, 4},
 };
 static arc arcs_76_5[1] = {
@@ -1678,7 +1679,7 @@ static arc arcs_77_1[1] = {
 	{107, 2},
 };
 static arc arcs_77_2[2] = {
-	{162, 3},
+	{163, 3},
 	{0, 2},
 };
 static arc arcs_77_3[1] = {
@@ -1712,7 +1713,7 @@ static state states_79[2] = {
 	{1, arcs_79_1},
 };
 static arc arcs_80_0[1] = {
-	{166, 1},
+	{167, 1},
 };
 static arc arcs_80_1[2] = {
 	{9, 2},
@@ -1728,11 +1729,11 @@ static state states_80[3] = {
 };
 static dfa dfas[81] = {
 	{256, "single_input", 0, 3, states_0,
-	 "\004\050\060\200\000\000\000\050\370\044\034\144\011\040\004\000\200\041\224\017\101"},
+	 "\004\050\060\200\000\000\000\050\370\044\034\144\011\040\004\000\000\103\050\037\202"},
 	{257, "file_input", 0, 2, states_1,
-	 "\204\050\060\200\000\000\000\050\370\044\034\144\011\040\004\000\200\041\224\017\101"},
+	 "\204\050\060\200\000\000\000\050\370\044\034\144\011\040\004\000\000\103\050\037\202"},
 	{258, "eval_input", 0, 3, states_2,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{259, "decorator", 0, 7, states_3,
 	 "\000\010\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
 	{260, "decorators", 0, 2, states_4,
@@ -1752,13 +1753,13 @@ static dfa dfas[81] = {
 	{267, "vfpdef", 0, 2, states_11,
 	 "\000\000\040\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
 	{268, "stmt", 0, 2, states_12,
-	 "\000\050\060\200\000\000\000\050\370\044\034\144\011\040\004\000\200\041\224\017\101"},
+	 "\000\050\060\200\000\000\000\050\370\044\034\144\011\040\004\000\000\103\050\037\202"},
 	{269, "simple_stmt", 0, 4, states_13,
-	 "\000\040\040\200\000\000\000\050\370\044\034\000\000\040\004\000\200\041\224\017\100"},
+	 "\000\040\040\200\000\000\000\050\370\044\034\000\000\040\004\000\000\103\050\037\200"},
 	{270, "small_stmt", 0, 2, states_14,
-	 "\000\040\040\200\000\000\000\050\370\044\034\000\000\040\004\000\200\041\224\017\100"},
+	 "\000\040\040\200\000\000\000\050\370\044\034\000\000\040\004\000\000\103\050\037\200"},
 	{271, "expr_stmt", 0, 6, states_15,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{272, "augassign", 0, 2, states_16,
 	 "\000\000\000\000\000\200\377\007\000\000\000\000\000\000\000\000\000\000\000\000\000"},
 	{273, "del_stmt", 0, 3, states_17,
@@ -1766,7 +1767,7 @@ static dfa dfas[81] = {
 	{274, "pass_stmt", 0, 2, states_18,
 	 "\000\000\000\000\000\000\000\040\000\000\000\000\000\000\000\000\000\000\000\000\000"},
 	{275, "flow_stmt", 0, 2, states_19,
-	 "\000\000\000\000\000\000\000\000\170\000\000\000\000\000\000\000\000\000\000\000\100"},
+	 "\000\000\000\000\000\000\000\000\170\000\000\000\000\000\000\000\000\000\000\000\200"},
 	{276, "break_stmt", 0, 2, states_20,
 	 "\000\000\000\000\000\000\000\000\010\000\000\000\000\000\000\000\000\000\000\000\000"},
 	{277, "continue_stmt", 0, 2, states_21,
@@ -1774,7 +1775,7 @@ static dfa dfas[81] = {
 	{278, "return_stmt", 0, 3, states_22,
 	 "\000\000\000\000\000\000\000\000\040\000\000\000\000\000\000\000\000\000\000\000\000"},
 	{279, "yield_stmt", 0, 2, states_23,
-	 "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\100"},
+	 "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\200"},
 	{280, "raise_stmt", 0, 5, states_24,
 	 "\000\000\000\000\000\000\000\000\100\000\000\000\000\000\000\000\000\000\000\000\000"},
 	{281, "import_stmt", 0, 2, states_25,
@@ -1800,7 +1801,7 @@ static dfa dfas[81] = {
 	{291, "assert_stmt", 0, 5, states_35,
 	 "\000\000\000\000\000\000\000\000\000\000\020\000\000\000\000\000\000\000\000\000\000"},
 	{292, "compound_stmt", 0, 2, states_36,
-	 "\000\010\020\000\000\000\000\000\000\000\000\144\011\000\000\000\000\000\000\000\001"},
+	 "\000\010\020\000\000\000\000\000\000\000\000\144\011\000\000\000\000\000\000\000\002"},
 	{293, "if_stmt", 0, 8, states_37,
 	 "\000\000\000\000\000\000\000\000\000\000\000\004\000\000\000\000\000\000\000\000\000"},
 	{294, "while_stmt", 0, 8, states_38,
@@ -1816,67 +1817,67 @@ static dfa dfas[81] = {
 	{299, "except_clause", 0, 5, states_43,
 	 "\000\000\000\000\000\000\000\000\000\000\000\000\100\000\000\000\000\000\000\000\000"},
 	{300, "suite", 0, 5, states_44,
-	 "\004\040\040\200\000\000\000\050\370\044\034\000\000\040\004\000\200\041\224\017\100"},
+	 "\004\040\040\200\000\000\000\050\370\044\034\000\000\040\004\000\000\103\050\037\200"},
 	{301, "test", 0, 6, states_45,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{302, "test_nocond", 0, 2, states_46,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{303, "lambdef", 0, 5, states_47,
 	 "\000\000\000\000\000\000\000\000\000\000\000\000\000\040\000\000\000\000\000\000\000"},
 	{304, "lambdef_nocond", 0, 5, states_48,
 	 "\000\000\000\000\000\000\000\000\000\000\000\000\000\040\000\000\000\000\000\000\000"},
 	{305, "or_test", 0, 2, states_49,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\004\000\000\103\050\037\000"},
 	{306, "and_test", 0, 2, states_50,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\004\000\000\103\050\037\000"},
 	{307, "not_test", 0, 3, states_51,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\004\000\000\103\050\037\000"},
 	{308, "comparison", 0, 2, states_52,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\000\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\000\000\000\103\050\037\000"},
 	{309, "comp_op", 0, 4, states_53,
-	 "\000\000\000\000\000\000\000\000\000\000\000\200\000\000\304\037\000\000\000\000\000"},
+	 "\000\000\000\000\000\000\000\000\000\000\000\200\000\000\304\077\000\000\000\000\000"},
 	{310, "star_expr", 0, 3, states_54,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\000\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\000\000\000\103\050\037\000"},
 	{311, "expr", 0, 2, states_55,
-	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\200\041\224\017\000"},
+	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\000\103\050\037\000"},
 	{312, "xor_expr", 0, 2, states_56,
-	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\200\041\224\017\000"},
+	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\000\103\050\037\000"},
 	{313, "and_expr", 0, 2, states_57,
-	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\200\041\224\017\000"},
+	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\000\103\050\037\000"},
 	{314, "shift_expr", 0, 2, states_58,
-	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\200\041\224\017\000"},
+	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\000\103\050\037\000"},
 	{315, "arith_expr", 0, 2, states_59,
-	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\200\041\224\017\000"},
+	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\000\103\050\037\000"},
 	{316, "term", 0, 2, states_60,
-	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\200\041\224\017\000"},
+	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\000\103\050\037\000"},
 	{317, "factor", 0, 3, states_61,
-	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\200\041\224\017\000"},
+	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\000\103\050\037\000"},
 	{318, "power", 0, 4, states_62,
-	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\000\000\224\017\000"},
+	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\000\000\050\037\000"},
 	{319, "atom", 0, 9, states_63,
-	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\000\000\224\017\000"},
+	 "\000\040\040\000\000\000\000\000\000\040\000\000\000\000\000\000\000\000\050\037\000"},
 	{320, "testlist_comp", 0, 5, states_64,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{321, "trailer", 0, 7, states_65,
-	 "\000\040\000\000\000\000\000\000\000\020\000\000\000\000\000\000\000\000\004\000\000"},
+	 "\000\040\000\000\000\000\000\000\000\020\000\000\000\000\000\000\000\000\010\000\000"},
 	{322, "subscriptlist", 0, 3, states_66,
-	 "\000\040\040\202\000\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\202\000\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{323, "subscript", 0, 5, states_67,
-	 "\000\040\040\202\000\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\202\000\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{324, "sliceop", 0, 3, states_68,
 	 "\000\000\000\002\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
 	{325, "exprlist", 0, 3, states_69,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\000\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\000\000\000\000\103\050\037\000"},
 	{326, "testlist", 0, 3, states_70,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{327, "dictorsetmaker", 0, 11, states_71,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{328, "classdef", 0, 8, states_72,
-	 "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\001"},
+	 "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\002"},
 	{329, "arglist", 0, 8, states_73,
-	 "\000\040\040\200\001\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\001\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{330, "argument", 0, 4, states_74,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{331, "comp_iter", 0, 2, states_75,
 	 "\000\000\000\000\000\000\000\000\000\000\000\104\000\000\000\000\000\000\000\000\000"},
 	{332, "comp_for", 0, 6, states_76,
@@ -1884,13 +1885,13 @@ static dfa dfas[81] = {
 	{333, "comp_if", 0, 4, states_77,
 	 "\000\000\000\000\000\000\000\000\000\000\000\004\000\000\000\000\000\000\000\000\000"},
 	{334, "testlist1", 0, 2, states_78,
-	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\200\041\224\017\000"},
+	 "\000\040\040\200\000\000\000\000\000\040\000\000\000\040\004\000\000\103\050\037\000"},
 	{335, "encoding_decl", 0, 2, states_79,
 	 "\000\000\040\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"},
 	{336, "yield_expr", 0, 3, states_80,
-	 "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\100"},
+	 "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\200"},
 };
-static label labels[167] = {
+static label labels[168] = {
 	{0, "EMPTY"},
 	{256, 0},
 	{4, 0},
@@ -2015,6 +2016,7 @@ static label labels[167] = {
 	{31, 0},
 	{30, 0},
 	{29, 0},
+	{29, 0},
 	{1, "is"},
 	{312, 0},
 	{18, 0},
@@ -2062,6 +2064,6 @@ static label labels[167] = {
 grammar _PyParser_Grammar = {
 	81,
 	dfas,
-	{167, labels},
+	{168, labels},
 	256
 };
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 27c9d23ea5c..9159b4c67b8 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -1011,6 +1011,8 @@ static int PARSER_FLAGS(PyCompilerFlags *flags)
 		parser_flags |= PyPARSE_DONT_IMPLY_DEDENT;
 	if (flags->cf_flags & PyCF_IGNORE_COOKIE)
 		parser_flags |= PyPARSE_IGNORE_COOKIE;
+	if (flags->cf_flags & CO_FUTURE_BARRY_AS_BDFL)
+		parser_flags |= PyPARSE_BARRY_AS_BDFL;
 	return parser_flags;
 }