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Question: Why is the || operator not working

Question:Why is the || operator not working

C_R 3292 Maple
cat evaluation concatenation
April 04 2025
2

Only for my understanding:
Why is the concatenation operator not working in this assignment on the righthand side

for i to 5 do
  x_ || i := x_ ||(i-1); 
end do;
                           x_1 := x_0

                           x_2 := x_0

                           x_3 := x_0

                           x_4 := x_0

                           x_5 := x_0

Somehow i in (i-1) equals always 1
Why do I have to use

for i to 5 do      
  x_ || i := cat(x_,i-1);  
end do;  
                           x_1 := x_0

                           x_2 := x_1

                           x_3 := x_2

                           x_4 := x_3

                           x_5 := x_4

 
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