IDL Problem Code 8 with alias illegal-arrow

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Execution Error

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

Best Practice

For modern IDL programming, we prefer users use the dot notation instead of arrow.

Dot (preferred)

p = plot(/test)
p.save

Arrow (not-preferred)

p = plot(/test)
p->save

This identifies arrow operators -> where they shouldn't be encountered.

The arrow operator should only be used to call a routine method.

Here's an example of where this error gets reported:

p = plot(/test)
p->
;^^ illegal arrow

To fix it, add in the method call or remove the bad code:

Fix: Add method

p = plot(/test)
p->save
;^^^^^^ OK!

Fix: Remove code

p = plot(/test)