Bug with the noun form of integrate



(%i3) 'integrate (x^2,x);
(%o3) 'integrate(x^2,x)

(%i4) 'integrate (v^2,x);
(%o4) v^2*x

(%i5) 'integrate (f(x),x);
(%o5) 'integrate(f(x),x)

(%i6) 'integrate (f(y),x);
(%o6) x*f(y)

(%i7) build_info();

Checked in:

Maxima version: 5.26.0
Maxima build date: 15:14 2/22/2012
Host type: x86_64-unknown-linux-gnu
Lisp implementation type: SBCL
Lisp implementation version: 1.0.29.11.debian

and:

Maxima version: 5.25.1
Maxima build date: 10:56 12/29/2011
Host type: x86_64-unknown-linux-gnu
Lisp implementation type: SBCL
Lisp implementation version: 1.0.50.0.debian

Regards,
Jaime