IDL Problem Code 106 with alias circular-include

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Warning

Include statements are an advanced concept in IDL and are not suggested for common use.

If you are using include statements consider using a procedure or function instead.

This identifies when a file that is included using @some_file creates a circular reference.

For example, take the contents of filea.pro which includes the contents of file b with @fileb:

a = 42
example = 'foobar-ed'
@fileb
; ^^^^ fileb imports filea and is circular

And the contents of fileb.pro which includes the contents of file a with @filea

b = 42
example = 'please dont do this'
@filea
; ^^^^ filea imports fileb and is circular

To fix this, correct the imports so they are not circular.