IDL Problem Code 84 with alias illegal-subscript

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Execution Error

This is a fatal error that prevents IDL from compiling or running code

This problem, using types, identifies when you are using array-styles subscripting on a data type that does not allow it.

This applies to data structures such as, hashes, orderedhashes, and dictionaries.

Here is some code that reproduces the error:

a = hash()
b = a[1:3]
;    ^^^^^ illegal subscript

To fix, correct your statement or re-write your code:

a = hash()
b = a['my-key]
;    ^^^^^^^^^ OK!