python · ambv · Jan 26, 2018 · ambv · Jan 26, 2018 · gvanrossum
diff --git a/Python/compile.c b/Python/compile.c
+    ann_as_str = PyUnicode_InternFromString(ann_as_charp);
+    if (!ann_as_str)
+        return 0;
+    ADDOP_O(c, LOAD_CONST, ann_as_str, consts);
diff --git a/Python/compile.c b/Python/compile.c
+    char *ann_as_charp;
+    static PyObject *ann_as_str;
+
+    ann_as_charp = PyAST_StrFromAstExpr(annotation, 1, 1);
diff --git a/Python/ast.c b/Python/ast.c
+wrap_parens(char * str)
+{
+    char *result;
+    result = PyMem_RawMalloc(strlen(str) + 3);
diff --git a/Python/ast.c b/Python/ast.c
+        return str_for_ast_list(e);
+    case Tuple_kind:
+        return str_for_ast_tuple(e, omit_parens);
+    }
diff --git a/Include/ast.h b/Include/ast.h
@@ -15,6 +15,10 @@ PyAPI_FUNC(mod_ty) PyAST_FromNodeObject(
    PyCompilerFlags *flags,
    PyObject *filename,
    PyArena *arena);
+PyAPI_FUNC(PyObject *) PyAST_UnicodeFromAstExpr(
diff --git a/Include/code.h b/Include/code.h
-    int co_nlocals;		/* #local variables */
-    int co_stacksize;		/* #entries needed for evaluation stack */
-    int co_flags;		/* CO_..., see below */
+    int co_argcount;            /* #arguments, except *args */
diff --git a/Lib/test/test_future.py b/Lib/test/test_future.py
+    template = dedent(
+        """
+        from __future__ import annotations
+        def f() -> {ann}:
diff --git a/PCbuild/pythoncore.vcxproj b/PCbuild/pythoncore.vcxproj
@@ -357,6 +357,7 @@
    <ClCompile Include="..\Python\_warnings.c" />
    <ClCompile Include="..\Python\asdl.c" />
    <ClCompile Include="..\Python\ast.c" />
+    <ClCompile Include="..\Python\ast_unparse.c" />
diff --git a/Python/compile.c b/Python/compile.c
+static int
+compiler_visit_annexpr(struct compiler *c, expr_ty annotation)
+{
+    static PyObject *ann_as_str;
diff --git a/Python/ast_unparse.c b/Python/ast_unparse.c
+    if (ret == -1)
+        return ret;
+
+    if (e->v.Yield.value)
diff --git a/Python/ast_unparse.c b/Python/ast_unparse.c
+    if (ret == -1)
+        return ret;
+
+    if (e->v.Yield.value)
diff --git a/Python/ast_unparse.c b/Python/ast_unparse.c
+}
+
+static int
+append_ast_str(_PyUnicodeWriter *writer, expr_ty e, bool omit_string_brackets)
diff --git a/Python/ast_unparse.c b/Python/ast_unparse.c
+    case Num_kind:
+        return append_repr(writer, e->v.Num.n);
+    case Str_kind:
+        return append_ast_str(writer, e, omit_string_brackets);
diff --git a/Python/ast_unparse.c b/Python/ast_unparse.c
+    case Bytes_kind:
+        return append_repr(writer, e->v.Bytes.s);
+    case Ellipsis_kind:
+        return append_charp(writer, "...");
diff --git a/Doc/whatsnew/3.7.rst b/Doc/whatsnew/3.7.rst
+    class B:
+        ...
+
+Since this change breaks compatibiltiy, the new behavior can be enabled