Copy is broken on 2x2 integer matrix (mutability is not set)

[hivert]

sage: M = sage.matrix.matrix_integer_2x2.MatrixSpace_ZZ_2x2()
sage: mat = M([3,4,5,6])
sage: mat.is_mutable()
True
sage: mat = copy(mat)
sage: mat.is_mutable()
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)

/home/hivert/<ipython console> in <module>()

/usr/local/sage2/local/lib/python2.6/site-packages/sage/matrix/matrix0.so in sage.matrix.matrix0.Matrix.is_mutable (sage/matrix/matrix0.c:3928)()

AttributeError: 'NoneType' object has no attribute 'is_mutable'

Component: linear algebra

Keywords: Matrix 2x2, mutability, copy

Author: Florent Hivert

Reviewer: Martin Raum

Merged: sage-4.3.4.alpha0

Issue created by migration from https://trac.sagemath.org/ticket/8294

[hivert]

comment:1

Attachment: trac_8294-matrix_2x2_copy_mutability_fix-fh.patch.gz

Should be ready for review.

Florent

[sagetrac-mraum]

Reviewer: Martin Raum

[sagetrac-mraum]

comment:3

This applies cleanly and all tests pass. Positive review as is.
#8276 will follow soon.

[hivert]

comment:4

Replying to @sagetrac-mraum:

This applies cleanly and all tests pass. Positive review as is.
#8276 will follow soon.

Thanks a lot for this quick help !

[sagetrac-mvngu]

Merged: sage-4.3.4.alpha0