Why this error " Error detected within library code:   Shouldn't happen" 
shows up first time integrate is called, then the second time, the error do 
not show up? 

It seems something got loaded after first call? May be this something needs 
to be loaded earlier?

Using  official release:

>fricas --version
FriCAS 1.3.9
based on sbcl 2.3.0


                 Version: FriCAS 1.3.9
                 Timestamp: Sat Jul  8 03:48:50 PM CDT 2023

(1) -> integrate((c*(b*x^2+a)^(1/2))^(3/2)/x^4,x)                      
 
   >> Error detected within library code:
   Shouldn't happen

(1) -> integrate((c*(b*x^2+a)^(1/2))^(3/2)/x^4,x)

                          +------------+
               +--------+ |  +--------+
           x   |  2       |  |  2
         ++  c\|%A b + a \|c\|%A b + a
   (1)   |   --------------------------- d%A
        ++                 4
                         %A
                                         Type: 
Union(Expression(Integer),...)



Btw, the same thing happens in 1.3.8

--Nasser

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