IDL Problem Code 113 with alias logical-xor
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Warning Problem
This is a "problem" that gets reported to let users know how that behavior might not match what they expect.
When IDL's compile options are set to idl2, idl3, or logical_predicate, it changes the way that logical operations are handled.
This warning let's you know that you may want to re-work your code to avoid using xor within the logical statement. This is not an error, however, and everything should function as expected if you are familiar with the operator.
idl
compile_opt idl2
if a xor b then print, 'True!'
; ^^^ warning appears here