invalid use of ring notation gives bizarre post-preparser syntax error

[sagetrac-cwitty]

Consider this example:

sage: QQX = QQ['x']
sage: K.<x> = QQX
------------------------------------------------------------
   File "<ipython console>", line 1
     K = QQ,names=(u'x',)); (x,) = K._first_ngens(Integer(1))
                         ^
<type 'exceptions.SyntaxError'>: invalid syntax

I don't care if this actually works; but if it doesn't, it should fail with a friendlier error message. And where did the 'X' from QQX go?

Component: user interface

Issue created by migration from https://trac.sagemath.org/ticket/1084

[ncalexan]

Attachment: 1084-ncalexan-1.hg.gz

[ncalexan]

comment:1

Patch may require 1040-ncalexan-2.hg be attached first; check ticket 1040.

[sagetrac-mabshoff]

comment:2

applied to 2.8.12.rc0