Continuation prompt?
rascal-0.34.0
Synopsis
What is the continuation prompt >>>>>>
?
Description
When Rascal can not recognize a complete command yet, it will
prompt with this >>>>>>
:
rascal>x = 1
>>>>>>>
The reason is that it expects a ;
after every Assignment.
To cancel the entire command, provide an empty line:
rascal>
But we could also finish the command:
rascal>x = 1
>>>>>>>;
int: 1
Benefits
For typing more complex structured commands it is easy to split up a statement over several lines:
rascal>import IO;
ok
rascal>for (int i <- [0..11]) {
>>>>>>> println("Counting <i>");
>>>>>>>}
Counting 0
Counting 1
Counting 2
Counting 3
Counting 4
Counting 5
Counting 6
Counting 7
Counting 8
Counting 9
Counting 10
list[void]: []
As you can see the entire For loop only starts when the prompt recognizes the entire command.
Pitfalls
- If you type an empty line in the middle of a complex command, it is cancelled:
rascal>import IO;
ok
rascal>for (int i <- [0..11]) {
>>>>>>>
rascal>
- When copy/pasting code from an editor into the shell, frequently empty lines occur that trigger the cancellation behavior.