#3548 expand stops working after loading abs_integrate

[Emmanuel Roque]

After loading abs_integrate, expand no longer works with symbolic expressions involving integrals as arguments.

(%i1) assume(L>0);
(%o1) [L>0]
(%i2) (2*integrate((f(xvar)-B*xvar-A)*sin((%pi*(2*n-1)*xvar)/(2*L)),xvar,0,L))/L;
(%o2) (2*integrate((f(xvar)-B*xvar-A)*sin((%pi*(2*n-1)*xvar)/(2*L)),xvar,0,L))/L
(%i3) expand(%);
(%o3) (2*integrate(f(xvar)*sin((%pi*n*xvar)/L-(%pi*xvar)/(2*L))-B*xvar*sin((%pi*n*xvar)/L-(%pi*xvar)/(2*L))-A*sin((%pi*n*xvar)/L-(%pi*xvar)/(2*L)),xvar,0,L))/L
(%i4) load(abs_integrate);
(%o4) "/usr/share/maxima/5.42.2/share/contrib/integration/abs_integrate.mac"
(%i5) (2*integrate((f(xvar)-B*xvar-A)*sin((%pi*(2*n-1)*xvar)/(2*L)),xvar,0,L))/L;
(%o5) (2*integrate((f(xvar)-B*xvar-A)*sin((%pi*(2*n-1)*xvar)/(2*L)),xvar,0,L))/L
(%i6) expand(%);
Message from the stdout of Maxima: Welcome to LDB, a low-level debugger for the Lisp runtime environment.
ldb>
Message from maxima's stderr stream: Heap exhausted during garbage collection: 0 bytes available, 16 requested.
Gen  Boxed Unboxed   LgBox LgUnbox  Pin       Alloc     Waste        Trig      WP GCs Mem-age
0       0       0       0       0    0           0         0    10737418       0   0  0.0000
1       0       0       0       0    0           0         0    10737418       0   0  0.0000
2       0       0       0       0    0           0         0    10737418       0   0  0.0000
3   14301     146       0       0   25   473170048    229248    10737418   14447   0  0.9063
4    8399     120       0       0   72   278862272    288320     2000000    8519   0  0.0000
5       0       0       0       0    0           0         0     2000000       0   0  0.0000
6     736     409      70      72    0    41179792    992624     2000000    1287   0  0.0000
7    8369     146       0       0    0   278985520     34000     2000000    8515   0  0.0000
           Total bytes allocated    =    1072197632
           Dynamic-space-size bytes =    1073741824
GC control variables:
   *GC-INHIBIT* = true
   *GC-PENDING* = true
   *STOP-FOR-GC-PENDING* = false
fatal error encountered in SBCL pid 12358(tid 0x7f5c74640080):
Heap exhausted, game over.

This is my build_info

(%i2) build_info();
(%o2) build_info(version="5.42.2",timestamp="2019-01-24 07:48:00",host="x86_64-pc-linux-gnu",
lisp_name="SBCL",lisp_version="1.4.10.debian")

[Barton Willis]

Fixed by Commit [3ca423]. Appended regression test. Closing ticket.