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[QUOTE="Mike Treseler, post: 3655113"]
It's not.
Either simplify the condition or use if/then/elsif...

-- Mike Treseler

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57 Thu Oct 16 /evtfs/home/tres> verror 1186
vcom Message # 1186:
When the expression is of an array type, the length of the array must
be known at compile time.  The simulator is less restrictive than the
LRM requires as long as the array length of the expression can be
determined in the compiler.
IEEE Std 1076-1993, 8.8 Case statement:

If the expression is of a one-dimensional character array type, then
  the expression must be one of the following:
    -- The name of an object whose subtype is locally static
    -- An indexed name whose prefix is one of the members of this list
       and whose indexing expressions are locally static expressions
    -- A slice name whose prefix is one of the members of this list and
       whose discrete range is a locally static discrete range
    -- A function call whose return type mark denotes a locally static
       subtype
    -- A qualified expression or type conversion whose type mark
       denotes a locally static subtype

It is an error if the element subtype of the one-dimensional character
  array type is not a locally static subtype.
[/QUOTE]

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