listop ...
Documentation for listop ...
assembled from the following types:
language documentation Operators
From Operators
(Operators) listop ...
Called the yada, yada, yada operator or stub operator, if it's the only statement in a routine or type, it marks that routine or type as a stub (which is significant in the context of pre-declaring types and composing roles).
If the ...
statement is executed, it calls fail, with the default message Stub code executed
.