IDL Problem Code 15 with alias colon-in-func-method

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Warning

Using a colon for indexing should only happy when using brackets.

Legacy IDL code allowed for both, but modern usage of IDL should have brackets and not parentheses.

This identifies when we have a function method call that contains the colon operator inside.

It indicates that you should likely be using brackets to index your arrays and not parentheses.

!null = myvar.thing(1:42)
                   ;^^^^^^^ Colon in function

To fix, swap out your parentheses with brackets:

!null = myvar.thing[1:42]
                   ;^^^^^^^ Yippee, no problem!