IDL Problem Code 33 with alias unclosed-main

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Execution Error

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

If you have a main level program without an end, you'll get this error

; main level
compile_opt idl2
a = 'foo'
if !true then begin

endif
; ^^^^ unclosed main

To correct, add an end statement:

; main level
compile_opt idl2
a = 'foo'
if !true then begin

endif
end

Concept: Batch Files

This error is a helper "error" to catch common mistakes. It is not a fatal error unless you have block statements in your main level program.

If you exclude the final end you can use executive commands (like .reset and .compile freely), but this is an advanced use case and not common.