REBOL 3 Docs Guide Concepts Functions Datatypes Errors
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REBOL 3 Errors: expect-set

Two series values were used together in a way that was not compatible. For instance, when trying to do a union between a string and a block.


["Expected one of:" :arg1 "- not:" :arg2]


filter-error try [union [a b c] "a b c"]
** Script Error: Expected one of: block! - not: string!
** Where: union [a b c] "a b c"

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