do 
  1
  2

The result is a PositiveInteger?. I don't read the value 2

------------------
That is a feature?? (perhaps useful just for its side effects; and do seems not documented -- it is equivalent to adding semicolons to each line of the pile, without the type info outputted on each line except the last). You need to explicitly ask to display a value.

do
  1
  2

%

(1)

do i for i in 1..3

%

(2)

x:=do [i for i in 1..3]

x

(3)

1;

2;

%

(4)

I need the do command for tests with => in interpret input.

1=2 => 3

2=2 => 4

(5)

Isn't right.

do 
  1=2 => 3
  2=2 => 4

is better. I don't understand why the do command runs with a semicolon ; at the end. If I don't want any display I add a semicolon, if not I get the result.

Quoted from the Aldor User Guide at http://www.aldor.org/docs/HTML/chap5.html#7

The do expression evaluates E and discards the computed value, so that the do expression returns no value.

do E

Status: open => rejected