Stop using old_style_globals

[jdemeyer]

Instead of using Cython's old_style_globals option, we use the new user_globals from #12446 to access globals().

In order to support

sage: sage_eval( ("f(x)=x^2", "f(1)") )

we make a small change to the preparser: we ensure that f(x) = ... makes x available both as global and as local.

Depends on #12446
Depends on #18084

Component: cython

Author: Jeroen Demeyer

Branch/Commit: u/jdemeyer/stop_using_old_style_globals @ 9ccd889

Issue created by migration from https://trac.sagemath.org/ticket/18083

[jdemeyer]

Branch: u/jdemeyer/stop_using_old_style_globals

[jdemeyer]

Changed dependencies from #12446 to #12446, #18084

[jdemeyer]

Commit: 265b56c

[jdemeyer]

New commits:

b5b2726	Introduce user_globals
704007e	Make it an error to use user_globals with initialization
265b56c	Use user_globals instead of Cython's old_style_globals

[sagetrac-git]

Changed commit from 265b56c to e4fc3ea

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

0056d0a	Do not use var() in the Sage library
f680be3	Use SR.var()
b0a4317	Merge commit 'f680be3a9f7da9ca3957a9709997a30917bba687' into HEAD
e4fc3ea	Use user_globals instead of Cython's old_style_globals

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

c98b7d8

Use user_globals instead of Cython's old_style_globals

[sagetrac-git]

Changed commit from e4fc3ea to c98b7d8

[jdemeyer]

Description changed:

--- 
+++ 
@@ -1 +1,8 @@
+Instead of using Cython's `old_style_globals` option, we use the new `user_globals` from #12446 to access `globals()`.
 
+In order to support
+
+```
+sage: sage_eval( ("f(x)=x^2", "f(1)") )
+```
+we make a small change to the preparser: we ensure that `f(x) = ...` makes `x` available *both* as global and as local.

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

9ccd889

Use user_globals instead of Cython's old_style_globals

[sagetrac-git]

Changed commit from c98b7d8 to 9ccd889