error

error(message)

:: Forces Asir to cause an error and enter debugging mode.

message

string

• When Asir encounters a serious error such that it finds difficult to continue execution, it, in general, tries to enter debugging mode before it returns to top level. The command error() forces a similar behavior in a user program.
• The argument is a string which will be displayed when error() will be executed.
• You can enter the debug-mode when your program encounters an illegal value for a program variable, if you have written the program so as to call error() upon finding such an error in your program text.

% cat mod3
def mod3(A) {
        if ( type(A) >= 2 )
                error("invalid argument");
        else
                return A % 3;
}
end$
% asir
[0] load("mod3");
1
[3] mod3(5);
2
[4] mod3(x);
invalid argument
stopped in mod3 at line 3 in file "./mod3"
3                       error("invalid argument");
(debug) print A
A = x
(debug) quit
return to toplevel
[4] 

References

section debug.

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